content/browser/web_contents/web_contents_view

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This source file includes following definitions.
CreateWebContentsView
IsScrollEndEffectEnabled
ShouldNavigateForward
ShouldNavigateBack
ToRenderWidgetHostViewAura
forward_events_
stop_forwarding_events
web_contents_window
OnScrollEvent
OnGestureEvent
contents_
Observe
window
PrepareDragForFileContents
PrepareDragForDownload
PrepareDragData
PrepareDropData
ConvertFromWeb
ConvertToWeb
ConvertAuraEventFlagsToWebInputEventModifiers
parent_
WindowObserver
OnWindowAdded
OnWillRemoveWindow
OnWindowVisibilityChanged
OnWindowParentChanged
OnWindowBoundsChanged
OnWindowAddedToRootWindow
OnWindowRemovingFromRootWindow
OnHostMoved
SendScreenRects
UpdateConstrainedWindows
touch_editable_
SetupOverlayWindowForTesting
SetTouchEditableForTest
SizeChangedCommon
EndDrag
InstallOverscrollControllerDelegate
PrepareOverscrollWindow
PrepareContentWindowForOverscroll
ResetOverscrollTransform
CompleteOverscrollNavigation
GetWindowToAnimateForOverscroll
GetTranslationForOverscroll
PrepareOverscrollNavigationOverlay
UpdateOverscrollWindowBrightness
AttachTouchEditableToRenderView
OverscrollUpdateForWebContentsDelegate
GetNativeView
GetContentNativeView
GetTopLevelNativeWindow
GetContainerBounds
OnTabCrashed
SizeContents
Focus
SetInitialFocus
StoreFocus
RestoreFocus
GetDropData
GetViewBounds
CreateView
CreateViewForWidget
CreateViewForPopupWidget
SetPageTitle
RenderViewCreated
RenderViewSwappedIn
SetOverscrollControllerEnabled
ShowContextMenu
StartDragging
UpdateDragCursor
GotFocus
TakeFocus
GetVisibleBounds
OnOverscrollUpdate
OnOverscrollComplete
OnOverscrollModeChange
OnImplicitAnimationsCompleted
GetMinimumSize
GetMaximumSize
OnBoundsChanged
GetCursor
GetNonClientComponent
ShouldDescendIntoChildForEventHandling
CanFocus
OnCaptureLost
OnPaint
OnDeviceScaleFactorChanged
OnWindowDestroying
OnWindowDestroyed
OnWindowTargetVisibilityChanged
HasHitTestMask
GetHitTestMask
OnKeyEvent
OnMouseEvent
OnDragEntered
OnDragUpdated
OnDragExited
OnPerformDrop
// Copyright (c) 2012 The Chromium Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.

#include "content/browser/web_contents/web_contents_view_aura.h"

#include "base/auto_reset.h"
#include "base/command_line.h"
#include "base/file_util.h"
#include "base/metrics/histogram.h"
#include "base/strings/utf_string_conversions.h"
#include "content/browser/download/drag_download_util.h"
#include "content/browser/frame_host/interstitial_page_impl.h"
#include "content/browser/frame_host/navigation_entry_impl.h"
#include "content/browser/renderer_host/dip_util.h"
#include "content/browser/renderer_host/overscroll_controller.h"
#include "content/browser/renderer_host/render_view_host_factory.h"
#include "content/browser/renderer_host/render_view_host_impl.h"
#include "content/browser/renderer_host/render_widget_host_impl.h"
#include "content/browser/renderer_host/render_widget_host_view_aura.h"
#include "content/browser/web_contents/aura/gesture_nav_simple.h"
#include "content/browser/web_contents/aura/image_window_delegate.h"
#include "content/browser/web_contents/aura/overscroll_navigation_overlay.h"
#include "content/browser/web_contents/aura/shadow_layer_delegate.h"
#include "content/browser/web_contents/aura/window_slider.h"
#include "content/browser/web_contents/touch_editable_impl_aura.h"
#include "content/browser/web_contents/web_contents_impl.h"
#include "content/public/browser/content_browser_client.h"
#include "content/public/browser/notification_observer.h"
#include "content/public/browser/notification_registrar.h"
#include "content/public/browser/notification_source.h"
#include "content/public/browser/notification_types.h"
#include "content/public/browser/overscroll_configuration.h"
#include "content/public/browser/render_view_host.h"
#include "content/public/browser/render_widget_host.h"
#include "content/public/browser/render_widget_host_view.h"
#include "content/public/browser/web_contents_delegate.h"
#include "content/public/browser/web_contents_observer.h"
#include "content/public/browser/web_contents_view_delegate.h"
#include "content/public/browser/web_drag_dest_delegate.h"
#include "content/public/common/content_client.h"
#include "content/public/common/content_switches.h"
#include "content/public/common/drop_data.h"
#include "net/base/net_util.h"
#include "third_party/WebKit/public/web/WebInputEvent.h"
#include "ui/aura/client/aura_constants.h"
#include "ui/aura/client/window_tree_client.h"
#include "ui/aura/env.h"
#include "ui/aura/window.h"
#include "ui/aura/window_observer.h"
#include "ui/aura/window_tree_host.h"
#include "ui/aura/window_tree_host_observer.h"
#include "ui/base/clipboard/clipboard.h"
#include "ui/base/clipboard/custom_data_helper.h"
#include "ui/base/dragdrop/drag_drop_types.h"
#include "ui/base/dragdrop/drag_utils.h"
#include "ui/base/dragdrop/drop_target_event.h"
#include "ui/base/dragdrop/os_exchange_data.h"
#include "ui/base/hit_test.h"
#include "ui/compositor/layer.h"
#include "ui/compositor/scoped_layer_animation_settings.h"
#include "ui/events/event.h"
#include "ui/events/event_utils.h"
#include "ui/gfx/canvas.h"
#include "ui/gfx/image/image.h"
#include "ui/gfx/image/image_png_rep.h"
#include "ui/gfx/image/image_skia.h"
#include "ui/gfx/screen.h"
#include "ui/wm/public/drag_drop_client.h"
#include "ui/wm/public/drag_drop_delegate.h"

namespace content {
WebContentsViewPort* CreateWebContentsView(
    WebContentsImpl* web_contents,
    WebContentsViewDelegate* delegate,
    RenderViewHostDelegateView** render_view_host_delegate_view) {
  WebContentsViewAura* rv = new WebContentsViewAura(web_contents, delegate);
  *render_view_host_delegate_view = rv;
  return rv;
}

namespace {

bool IsScrollEndEffectEnabled() {
  return CommandLine::ForCurrentProcess()->GetSwitchValueASCII(
      switches::kScrollEndEffect) == "1";
}

bool ShouldNavigateForward(const NavigationController& controller,
                           OverscrollMode mode) {
  return mode == (base::i18n::IsRTL() ? OVERSCROLL_EAST : OVERSCROLL_WEST) &&
         controller.CanGoForward();
}

bool ShouldNavigateBack(const NavigationController& controller,
                        OverscrollMode mode) {
  return mode == (base::i18n::IsRTL() ? OVERSCROLL_WEST : OVERSCROLL_EAST) &&
         controller.CanGoBack();
}

RenderWidgetHostViewAura* ToRenderWidgetHostViewAura(
    RenderWidgetHostView* view) {
  if (!view || RenderViewHostFactory::has_factory())
    return NULL;  // Can't cast to RenderWidgetHostViewAura in unit tests.
  RenderProcessHostImpl* process = static_cast<RenderProcessHostImpl*>(
      view->GetRenderWidgetHost()->GetProcess());
  if (process->IsGuest())
    return NULL;
  return static_cast<RenderWidgetHostViewAura*>(view);
}

// The window delegate for the overscroll window. This redirects trackpad events
// to the web-contents window. The delegate destroys itself when the window is
// destroyed.
class OverscrollWindowDelegate : public ImageWindowDelegate {
 public:
  OverscrollWindowDelegate(WebContentsImpl* web_contents,
                           OverscrollMode overscroll_mode)
      : web_contents_(web_contents),
        forward_events_(true) {
    const NavigationControllerImpl& controller = web_contents->GetController();
    const NavigationEntryImpl* entry = NULL;
    if (ShouldNavigateForward(controller, overscroll_mode)) {
      entry = NavigationEntryImpl::FromNavigationEntry(
          controller.GetEntryAtOffset(1));
    } else if (ShouldNavigateBack(controller, overscroll_mode)) {
      entry = NavigationEntryImpl::FromNavigationEntry(
          controller.GetEntryAtOffset(-1));
    }

    gfx::Image image;
    if (entry && entry->screenshot().get()) {
      std::vector<gfx::ImagePNGRep> image_reps;
      image_reps.push_back(gfx::ImagePNGRep(entry->screenshot(),
          ui::GetImageScale(
              ui::GetScaleFactorForNativeView(web_contents_window()))));
      image = gfx::Image(image_reps);
    }
    SetImage(image);
  }

  void stop_forwarding_events() { forward_events_ = false; }

 private:
  virtual ~OverscrollWindowDelegate() {}

  aura::Window* web_contents_window() {
    return web_contents_->GetView()->GetContentNativeView();
  }

  // Overridden from ui::EventHandler.
  virtual void OnScrollEvent(ui::ScrollEvent* event) OVERRIDE {
    if (forward_events_ && web_contents_window())
      web_contents_window()->delegate()->OnScrollEvent(event);
  }

  virtual void OnGestureEvent(ui::GestureEvent* event) OVERRIDE {
    if (forward_events_ && web_contents_window())
      web_contents_window()->delegate()->OnGestureEvent(event);
  }

  WebContents* web_contents_;

  // The window is displayed both during the gesture, and after the gesture
  // while the navigation is in progress. During the gesture, it is necessary to
  // forward input events to the content page (e.g. when the overscroll window
  // slides under the cursor and starts receiving scroll events). However, once
  // the gesture is complete, and the window is being displayed as an overlay
  // window during navigation, events should not be forwarded anymore.
  bool forward_events_;

  DISALLOW_COPY_AND_ASSIGN(OverscrollWindowDelegate);
};

// Listens to all mouse drag events during a drag and drop and sends them to
// the renderer.
class WebDragSourceAura : public NotificationObserver {
 public:
  WebDragSourceAura(aura::Window* window, WebContentsImpl* contents)
      : window_(window),
        contents_(contents) {
    registrar_.Add(this,
                   NOTIFICATION_WEB_CONTENTS_DISCONNECTED,
                   Source<WebContents>(contents));
  }

  virtual ~WebDragSourceAura() {
  }

  // NotificationObserver:
  virtual void Observe(int type,
      const NotificationSource& source,
      const NotificationDetails& details) OVERRIDE {
    if (type != NOTIFICATION_WEB_CONTENTS_DISCONNECTED)
      return;

    // Cancel the drag if it is still in progress.
    aura::client::DragDropClient* dnd_client =
        aura::client::GetDragDropClient(window_->GetRootWindow());
    if (dnd_client && dnd_client->IsDragDropInProgress())
      dnd_client->DragCancel();

    window_ = NULL;
    contents_ = NULL;
  }

  aura::Window* window() const { return window_; }

 private:
  aura::Window* window_;
  WebContentsImpl* contents_;
  NotificationRegistrar registrar_;

  DISALLOW_COPY_AND_ASSIGN(WebDragSourceAura);
};

#if (!defined(OS_CHROMEOS) && defined(USE_X11)) || defined(OS_WIN)
// Fill out the OSExchangeData with a file contents, synthesizing a name if
// necessary.
void PrepareDragForFileContents(const DropData& drop_data,
                                ui::OSExchangeData::Provider* provider) {
  base::FilePath file_name =
      base::FilePath::FromUTF16Unsafe(drop_data.file_description_filename);
  // Images without ALT text will only have a file extension so we need to
  // synthesize one from the provided extension and URL.
  if (file_name.BaseName().RemoveExtension().empty()) {
    const base::FilePath::StringType extension = file_name.Extension();
    // Retrieve the name from the URL.
    file_name = net::GenerateFileName(drop_data.url, "", "", "", "", "")
                    .ReplaceExtension(extension);
  }
  provider->SetFileContents(file_name, drop_data.file_contents);
}
#endif

#if defined(OS_WIN)
void PrepareDragForDownload(
    const DropData& drop_data,
    ui::OSExchangeData::Provider* provider,
    WebContentsImpl* web_contents) {
  const GURL& page_url = web_contents->GetLastCommittedURL();
  const std::string& page_encoding = web_contents->GetEncoding();

  // Parse the download metadata.
  base::string16 mime_type;
  base::FilePath file_name;
  GURL download_url;
  if (!ParseDownloadMetadata(drop_data.download_metadata,
                             &mime_type,
                             &file_name,
                             &download_url))
    return;

  // Generate the file name based on both mime type and proposed file name.
  std::string default_name =
      GetContentClient()->browser()->GetDefaultDownloadName();
  base::FilePath generated_download_file_name =
      net::GenerateFileName(download_url,
                            std::string(),
                            std::string(),
                            base::UTF16ToUTF8(file_name.value()),
                            base::UTF16ToUTF8(mime_type),
                            default_name);

  // http://crbug.com/332579
  base::ThreadRestrictions::ScopedAllowIO allow_file_operations;

  base::FilePath temp_dir_path;
  if (!base::CreateNewTempDirectory(FILE_PATH_LITERAL("chrome_drag"),
                                    &temp_dir_path))
    return;

  base::FilePath download_path =
      temp_dir_path.Append(generated_download_file_name);

  // We cannot know when the target application will be done using the temporary
  // file, so schedule it to be deleted after rebooting.
  base::DeleteFileAfterReboot(download_path);
  base::DeleteFileAfterReboot(temp_dir_path);

  // Provide the data as file (CF_HDROP). A temporary download file with the
  // Zone.Identifier ADS (Alternate Data Stream) attached will be created.
  scoped_refptr<DragDownloadFile> download_file =
      new DragDownloadFile(
          download_path,
          base::File(),
          download_url,
          Referrer(page_url, drop_data.referrer_policy),
          page_encoding,
          web_contents);
  ui::OSExchangeData::DownloadFileInfo file_download(base::FilePath(),
                                                     download_file.get());
  provider->SetDownloadFileInfo(file_download);
}
#endif  // defined(OS_WIN)

// Utility to fill a ui::OSExchangeDataProvider object from DropData.
void PrepareDragData(const DropData& drop_data,
                     ui::OSExchangeData::Provider* provider,
                     WebContentsImpl* web_contents) {
  provider->MarkOriginatedFromRenderer();
#if defined(OS_WIN)
  // Put download before file contents to prefer the download of a image over
  // its thumbnail link.
  if (!drop_data.download_metadata.empty())
    PrepareDragForDownload(drop_data, provider, web_contents);
#endif
#if (!defined(OS_CHROMEOS) && defined(USE_X11)) || defined(OS_WIN)
  // We set the file contents before the URL because the URL also sets file
  // contents (to a .URL shortcut).  We want to prefer file content data over
  // a shortcut so we add it first.
  if (!drop_data.file_contents.empty())
    PrepareDragForFileContents(drop_data, provider);
#endif
  if (!drop_data.text.string().empty())
    provider->SetString(drop_data.text.string());
  if (drop_data.url.is_valid())
    provider->SetURL(drop_data.url, drop_data.url_title);
  if (!drop_data.html.string().empty())
    provider->SetHtml(drop_data.html.string(), drop_data.html_base_url);
  if (!drop_data.filenames.empty())
    provider->SetFilenames(drop_data.filenames);
  if (!drop_data.custom_data.empty()) {
    Pickle pickle;
    ui::WriteCustomDataToPickle(drop_data.custom_data, &pickle);
    provider->SetPickledData(ui::Clipboard::GetWebCustomDataFormatType(),
                             pickle);
  }
}

// Utility to fill a DropData object from ui::OSExchangeData.
void PrepareDropData(DropData* drop_data, const ui::OSExchangeData& data) {
  drop_data->did_originate_from_renderer = data.DidOriginateFromRenderer();

  base::string16 plain_text;
  data.GetString(&plain_text);
  if (!plain_text.empty())
    drop_data->text = base::NullableString16(plain_text, false);

  GURL url;
  base::string16 url_title;
  data.GetURLAndTitle(
      ui::OSExchangeData::DO_NOT_CONVERT_FILENAMES, &url, &url_title);
  if (url.is_valid()) {
    drop_data->url = url;
    drop_data->url_title = url_title;
  }

  base::string16 html;
  GURL html_base_url;
  data.GetHtml(&html, &html_base_url);
  if (!html.empty())
    drop_data->html = base::NullableString16(html, false);
  if (html_base_url.is_valid())
    drop_data->html_base_url = html_base_url;

  data.GetFilenames(&drop_data->filenames);

  Pickle pickle;
  if (data.GetPickledData(ui::Clipboard::GetWebCustomDataFormatType(), &pickle))
    ui::ReadCustomDataIntoMap(
        pickle.data(), pickle.size(), &drop_data->custom_data);
}

// Utilities to convert between blink::WebDragOperationsMask and
// ui::DragDropTypes.
int ConvertFromWeb(blink::WebDragOperationsMask ops) {
  int drag_op = ui::DragDropTypes::DRAG_NONE;
  if (ops & blink::WebDragOperationCopy)
    drag_op |= ui::DragDropTypes::DRAG_COPY;
  if (ops & blink::WebDragOperationMove)
    drag_op |= ui::DragDropTypes::DRAG_MOVE;
  if (ops & blink::WebDragOperationLink)
    drag_op |= ui::DragDropTypes::DRAG_LINK;
  return drag_op;
}

blink::WebDragOperationsMask ConvertToWeb(int drag_op) {
  int web_drag_op = blink::WebDragOperationNone;
  if (drag_op & ui::DragDropTypes::DRAG_COPY)
    web_drag_op |= blink::WebDragOperationCopy;
  if (drag_op & ui::DragDropTypes::DRAG_MOVE)
    web_drag_op |= blink::WebDragOperationMove;
  if (drag_op & ui::DragDropTypes::DRAG_LINK)
    web_drag_op |= blink::WebDragOperationLink;
  return (blink::WebDragOperationsMask) web_drag_op;
}

int ConvertAuraEventFlagsToWebInputEventModifiers(int aura_event_flags) {
  int web_input_event_modifiers = 0;
  if (aura_event_flags & ui::EF_SHIFT_DOWN)
    web_input_event_modifiers |= blink::WebInputEvent::ShiftKey;
  if (aura_event_flags & ui::EF_CONTROL_DOWN)
    web_input_event_modifiers |= blink::WebInputEvent::ControlKey;
  if (aura_event_flags & ui::EF_ALT_DOWN)
    web_input_event_modifiers |= blink::WebInputEvent::AltKey;
  if (aura_event_flags & ui::EF_COMMAND_DOWN)
    web_input_event_modifiers |= blink::WebInputEvent::MetaKey;
  return web_input_event_modifiers;
}

}  // namespace

class WebContentsViewAura::WindowObserver
    : public aura::WindowObserver, public aura::WindowTreeHostObserver {
 public:
  explicit WindowObserver(WebContentsViewAura* view)
      : view_(view),
        parent_(NULL) {
    view_->window_->AddObserver(this);

#if defined(OS_WIN)
    if (view_->window_->GetRootWindow())
      view_->window_->GetRootWindow()->AddObserver(this);
#endif
  }

  virtual ~WindowObserver() {
    view_->window_->RemoveObserver(this);
    if (view_->window_->GetHost())
      view_->window_->GetHost()->RemoveObserver(this);
    if (parent_)
      parent_->RemoveObserver(this);

#if defined(OS_WIN)
    if (parent_) {
      const aura::Window::Windows& children = parent_->children();
      for (size_t i = 0; i < children.size(); ++i)
        children[i]->RemoveObserver(this);
    }

    aura::Window* root_window = view_->window_->GetRootWindow();
    if (root_window) {
      root_window->RemoveObserver(this);
      const aura::Window::Windows& root_children = root_window->children();
      for (size_t i = 0; i < root_children.size(); ++i)
        root_children[i]->RemoveObserver(this);
    }
#endif
  }

  // Overridden from aura::WindowObserver:
#if defined(OS_WIN)
  // Constrained windows are added as children of the parent's parent's view
  // which may overlap with windowed NPAPI plugins. In that case, tell the RWHV
  // so that it can update the plugins' cutout rects accordingly.
  // Note: this is hard coding how Chrome layer adds its dialogs. Since NPAPI is
  // going to be deprecated in a year, this is ok for now. The test for this is
  // PrintPreviewTest.WindowedNPAPIPluginHidden.
  virtual void OnWindowAdded(aura::Window* new_window) OVERRIDE {
    if (new_window != view_->window_) {
      // Skip the case when the parent moves to the root window.
      if (new_window != parent_) {
        // Observe sibling windows of the WebContents, or children of the root
        // window.
        if (new_window->parent() == parent_ ||
            new_window->parent() == view_->window_->GetRootWindow()) {
          new_window->AddObserver(this);
        }
      }
    }

    if (new_window->parent() == parent_) {
      UpdateConstrainedWindows(NULL);
    }
  }

  virtual void OnWillRemoveWindow(aura::Window* window) OVERRIDE {
    if (window == view_->window_)
      return;

    window->RemoveObserver(this);
    UpdateConstrainedWindows(window);
  }

  virtual void OnWindowVisibilityChanged(aura::Window* window,
                                         bool visible) OVERRIDE {
    if (window == view_->window_ ||
        window->parent() == parent_ ||
        window->parent() == view_->window_->GetRootWindow()) {
      UpdateConstrainedWindows(NULL);
    }
  }
#endif

  virtual void OnWindowParentChanged(aura::Window* window,
                                     aura::Window* parent) OVERRIDE {
    if (window != view_->window_)
      return;
    if (parent_)
      parent_->RemoveObserver(this);

#if defined(OS_WIN)
    if (parent_) {
      const aura::Window::Windows& children = parent_->children();
      for (size_t i = 0; i < children.size(); ++i)
        children[i]->RemoveObserver(this);

      RenderWidgetHostViewAura* view = ToRenderWidgetHostViewAura(
          view_->web_contents_->GetRenderWidgetHostView());
      if (view)
        view->UpdateConstrainedWindowRects(std::vector<gfx::Rect>());
    }

    // When we get parented to the root window, the code below will watch the
    // parent, aka root window. Since we already watch the root window on
    // Windows, unregister first so that the debug check doesn't fire.
    if (parent && parent == window->GetRootWindow())
      parent->RemoveObserver(this);

    // We need to undo the above if we were parented to the root window and then
    // got parented to another window. At that point, the code before the ifdef
    // would have stopped watching the root window.
    if (window->GetRootWindow() &&
        parent != window->GetRootWindow() &&
        !window->GetRootWindow()->HasObserver(this)) {
      window->GetRootWindow()->AddObserver(this);
    }
#endif

    parent_ = parent;
    if (parent) {
      parent->AddObserver(this);
#if defined(OS_WIN)
      if (parent != window->GetRootWindow()) {
        const aura::Window::Windows& children = parent->children();
        for (size_t i = 0; i < children.size(); ++i) {
          if (children[i] != view_->window_)
            children[i]->AddObserver(this);
        }
      }
#endif
    }
  }

  virtual void OnWindowBoundsChanged(aura::Window* window,
                                     const gfx::Rect& old_bounds,
                                     const gfx::Rect& new_bounds) OVERRIDE {
    if (window == parent_ || window == view_->window_) {
      SendScreenRects();
      if (view_->touch_editable_)
        view_->touch_editable_->UpdateEditingController();
#if defined(OS_WIN)
    } else {
      UpdateConstrainedWindows(NULL);
#endif
    }
  }

  virtual void OnWindowAddedToRootWindow(aura::Window* window) OVERRIDE {
    if (window == view_->window_) {
      window->GetHost()->AddObserver(this);
#if defined(OS_WIN)
      if (!window->GetRootWindow()->HasObserver(this))
        window->GetRootWindow()->AddObserver(this);
#endif
    }
  }

  virtual void OnWindowRemovingFromRootWindow(aura::Window* window,
                                              aura::Window* new_root) OVERRIDE {
    if (window == view_->window_) {
      window->GetHost()->RemoveObserver(this);
#if defined(OS_WIN)
      window->GetRootWindow()->RemoveObserver(this);

      const aura::Window::Windows& root_children =
          window->GetRootWindow()->children();
      for (size_t i = 0; i < root_children.size(); ++i) {
        if (root_children[i] != view_->window_ && root_children[i] != parent_)
          root_children[i]->RemoveObserver(this);
      }
#endif
    }
  }

  // Overridden WindowTreeHostObserver:
  virtual void OnHostMoved(const aura::WindowTreeHost* host,
                           const gfx::Point& new_origin) OVERRIDE {
    TRACE_EVENT1("ui",
                 "WebContentsViewAura::WindowObserver::OnHostMoved",
                 "new_origin", new_origin.ToString());

    // This is for the desktop case (i.e. Aura desktop).
    SendScreenRects();
  }

 private:
  void SendScreenRects() {
    RenderWidgetHostImpl::From(view_->web_contents_->GetRenderViewHost())->
        SendScreenRects();
  }

#if defined(OS_WIN)
  void UpdateConstrainedWindows(aura::Window* exclude) {
    RenderWidgetHostViewAura* view = ToRenderWidgetHostViewAura(
        view_->web_contents_->GetRenderWidgetHostView());
    if (!view)
      return;

    std::vector<gfx::Rect> constrained_windows;
    if (parent_) {
      const aura::Window::Windows& children = parent_->children();
      for (size_t i = 0; i < children.size(); ++i) {
        if (children[i] != view_->window_ &&
            children[i] != exclude &&
            children[i]->IsVisible()) {
          constrained_windows.push_back(children[i]->GetBoundsInRootWindow());
        }
      }
    }

    aura::Window* root_window = view_->window_->GetRootWindow();
    const aura::Window::Windows& root_children = root_window->children();
    if (root_window) {
      for (size_t i = 0; i < root_children.size(); ++i) {
        if (root_children[i]->IsVisible() &&
            !root_children[i]->Contains(view_->window_.get())) {
          constrained_windows.push_back(
              root_children[i]->GetBoundsInRootWindow());
        }
      }
    }

    view->UpdateConstrainedWindowRects(constrained_windows);
  }
#endif

  WebContentsViewAura* view_;

  // We cache the old parent so that we can unregister when it's not the parent
  // anymore.
  aura::Window* parent_;

  DISALLOW_COPY_AND_ASSIGN(WindowObserver);
};

////////////////////////////////////////////////////////////////////////////////
// WebContentsViewAura, public:

WebContentsViewAura::WebContentsViewAura(
    WebContentsImpl* web_contents,
    WebContentsViewDelegate* delegate)
    : web_contents_(web_contents),
      delegate_(delegate),
      current_drag_op_(blink::WebDragOperationNone),
      drag_dest_delegate_(NULL),
      current_rvh_for_drag_(NULL),
      overscroll_change_brightness_(false),
      current_overscroll_gesture_(OVERSCROLL_NONE),
      completed_overscroll_gesture_(OVERSCROLL_NONE),
      touch_editable_(TouchEditableImplAura::Create()) {
}

////////////////////////////////////////////////////////////////////////////////
// WebContentsViewAura, private:

WebContentsViewAura::~WebContentsViewAura() {
  if (!window_)
    return;

  window_observer_.reset();

  // Window needs a valid delegate during its destructor, so we explicitly
  // delete it here.
  window_.reset();
}

void WebContentsViewAura::SetupOverlayWindowForTesting() {
  if (navigation_overlay_)
    navigation_overlay_->SetupForTesting();
}

void WebContentsViewAura::SetTouchEditableForTest(
    TouchEditableImplAura* touch_editable) {
  touch_editable_.reset(touch_editable);
  AttachTouchEditableToRenderView();
}

void WebContentsViewAura::SizeChangedCommon(const gfx::Size& size) {
  if (web_contents_->GetInterstitialPage())
    web_contents_->GetInterstitialPage()->SetSize(size);
  RenderWidgetHostView* rwhv =
      web_contents_->GetRenderWidgetHostView();
  if (rwhv)
    rwhv->SetSize(size);
}

void WebContentsViewAura::EndDrag(blink::WebDragOperationsMask ops) {
  aura::Window* root_window = GetNativeView()->GetRootWindow();
  gfx::Point screen_loc =
      gfx::Screen::GetScreenFor(GetNativeView())->GetCursorScreenPoint();
  gfx::Point client_loc = screen_loc;
  RenderViewHost* rvh = web_contents_->GetRenderViewHost();
  aura::Window* window = rvh->GetView()->GetNativeView();
  aura::Window::ConvertPointToTarget(root_window, window, &client_loc);
  if (!web_contents_)
    return;
  web_contents_->DragSourceEndedAt(client_loc.x(), client_loc.y(),
      screen_loc.x(), screen_loc.y(), ops);
}

void WebContentsViewAura::InstallOverscrollControllerDelegate(
    RenderWidgetHostImpl* host) {
  const std::string value = CommandLine::ForCurrentProcess()->
      GetSwitchValueASCII(switches::kOverscrollHistoryNavigation);
  if (value == "0") {
    navigation_overlay_.reset();
    return;
  }
  if (value == "2") {
    navigation_overlay_.reset();
    if (!gesture_nav_simple_)
      gesture_nav_simple_.reset(new GestureNavSimple(web_contents_));
    host->overscroll_controller()->set_delegate(gesture_nav_simple_.get());
    return;
  }
  host->overscroll_controller()->set_delegate(this);
  if (!navigation_overlay_)
    navigation_overlay_.reset(new OverscrollNavigationOverlay(web_contents_));
}

void WebContentsViewAura::PrepareOverscrollWindow() {
  // If there is an existing |overscroll_window_| which is in the middle of an
  // animation, then destroying the window here causes the animation to be
  // completed immidiately, which triggers |OnImplicitAnimationsCompleted()|
  // callback, and that tries to reset |overscroll_window_| again, causing a
  // double-free. So use a temporary variable here.
  if (overscroll_window_) {
    base::AutoReset<OverscrollMode> reset_state(&current_overscroll_gesture_,
                                                current_overscroll_gesture_);
    scoped_ptr<aura::Window> reset_window(overscroll_window_.release());
  }

  OverscrollWindowDelegate* overscroll_delegate = new OverscrollWindowDelegate(
      web_contents_,
      current_overscroll_gesture_);
  overscroll_window_.reset(new aura::Window(overscroll_delegate));
  overscroll_window_->SetType(ui::wm::WINDOW_TYPE_CONTROL);
  overscroll_window_->SetTransparent(true);
  overscroll_window_->Init(aura::WINDOW_LAYER_TEXTURED);
  overscroll_window_->layer()->SetMasksToBounds(false);
  overscroll_window_->SetName("OverscrollOverlay");

  overscroll_change_brightness_ = overscroll_delegate->has_image();
  window_->AddChild(overscroll_window_.get());

  gfx::Rect bounds = gfx::Rect(window_->bounds().size());
  if (ShouldNavigateForward(web_contents_->GetController(),
                            current_overscroll_gesture_)) {
    // The overlay will be sliding in from the right edge towards the left in
    // non-RTL, or sliding in from the left edge towards the right in RTL.
    // So position the overlay window accordingly.
    bounds.Offset(base::i18n::IsRTL() ? -bounds.width() : bounds.width(), 0);
  }

  aura::Window* animate_window = GetWindowToAnimateForOverscroll();
  if (animate_window == overscroll_window_)
    window_->StackChildAbove(overscroll_window_.get(), GetContentNativeView());
  else
    window_->StackChildBelow(overscroll_window_.get(), GetContentNativeView());

  UpdateOverscrollWindowBrightness(0.f);

  overscroll_window_->SetBounds(bounds);
  overscroll_window_->Show();

  overscroll_shadow_.reset(new ShadowLayerDelegate(animate_window->layer()));
}

void WebContentsViewAura::PrepareContentWindowForOverscroll() {
  StopObservingImplicitAnimations();
  aura::Window* content = GetContentNativeView();
  content->layer()->GetAnimator()->AbortAllAnimations();
  content->SetTransform(gfx::Transform());
  content->layer()->SetLayerBrightness(0.f);
}

void WebContentsViewAura::ResetOverscrollTransform() {
  if (!web_contents_->GetRenderWidgetHostView())
    return;
  aura::Window* target = GetWindowToAnimateForOverscroll();
  if (!target)
    return;
  {
    ui::ScopedLayerAnimationSettings settings(target->layer()->GetAnimator());
    settings.SetPreemptionStrategy(
        ui::LayerAnimator::IMMEDIATELY_ANIMATE_TO_NEW_TARGET);
    settings.SetTweenType(gfx::Tween::EASE_OUT);
    settings.AddObserver(this);
    target->SetTransform(gfx::Transform());
  }
  {
    ui::ScopedLayerAnimationSettings settings(target->layer()->GetAnimator());
    settings.SetPreemptionStrategy(
        ui::LayerAnimator::IMMEDIATELY_ANIMATE_TO_NEW_TARGET);
    settings.SetTweenType(gfx::Tween::EASE_OUT);
    UpdateOverscrollWindowBrightness(0.f);
  }
}

void WebContentsViewAura::CompleteOverscrollNavigation(OverscrollMode mode) {
  if (!web_contents_->GetRenderWidgetHostView())
    return;

  // Animate out the current view first. Navigate to the requested history at
  // the end of the animation.
  if (current_overscroll_gesture_ == OVERSCROLL_NONE)
    return;

  UMA_HISTOGRAM_ENUMERATION("Overscroll.Navigated",
                            current_overscroll_gesture_, OVERSCROLL_COUNT);
  OverscrollWindowDelegate* delegate = static_cast<OverscrollWindowDelegate*>(
      overscroll_window_->delegate());
  delegate->stop_forwarding_events();

  completed_overscroll_gesture_ = mode;
  aura::Window* target = GetWindowToAnimateForOverscroll();
  ui::ScopedLayerAnimationSettings settings(target->layer()->GetAnimator());
  settings.SetPreemptionStrategy(
      ui::LayerAnimator::IMMEDIATELY_ANIMATE_TO_NEW_TARGET);
  settings.SetTweenType(gfx::Tween::EASE_OUT);
  settings.AddObserver(this);
  gfx::Transform transform;
  int content_width =
      web_contents_->GetRenderWidgetHostView()->GetViewBounds().width();
  int translate_x = mode == OVERSCROLL_WEST ? -content_width : content_width;
  transform.Translate(translate_x, 0);
  target->SetTransform(transform);
  UpdateOverscrollWindowBrightness(translate_x);
}

aura::Window* WebContentsViewAura::GetWindowToAnimateForOverscroll() {
  if (current_overscroll_gesture_ == OVERSCROLL_NONE)
    return NULL;

  return ShouldNavigateForward(web_contents_->GetController(),
                               current_overscroll_gesture_) ?
      overscroll_window_.get() : GetContentNativeView();
}

gfx::Vector2d WebContentsViewAura::GetTranslationForOverscroll(int delta_x,
                                                               int delta_y) {
  if (current_overscroll_gesture_ == OVERSCROLL_NORTH ||
      current_overscroll_gesture_ == OVERSCROLL_SOUTH) {
    return gfx::Vector2d(0, delta_y);
  }
  // For horizontal overscroll, scroll freely if a navigation is possible. Do a
  // resistive scroll otherwise.
  const NavigationControllerImpl& controller = web_contents_->GetController();
  const gfx::Rect& bounds = GetViewBounds();
  if (ShouldNavigateForward(controller, current_overscroll_gesture_))
    return gfx::Vector2d(std::max(-bounds.width(), delta_x), 0);
  else if (ShouldNavigateBack(controller, current_overscroll_gesture_))
    return gfx::Vector2d(std::min(bounds.width(), delta_x), 0);
  return gfx::Vector2d();
}

void WebContentsViewAura::PrepareOverscrollNavigationOverlay() {
  OverscrollWindowDelegate* delegate = static_cast<OverscrollWindowDelegate*>(
      overscroll_window_->delegate());
  overscroll_window_->SchedulePaintInRect(
      gfx::Rect(overscroll_window_->bounds().size()));
  overscroll_window_->SetBounds(gfx::Rect(window_->bounds().size()));
  overscroll_window_->SetTransform(gfx::Transform());
  navigation_overlay_->SetOverlayWindow(overscroll_window_.Pass(),
                                        delegate);
  navigation_overlay_->StartObserving();
}

void WebContentsViewAura::UpdateOverscrollWindowBrightness(float delta_x) {
  if (!overscroll_change_brightness_)
    return;

  const float kBrightnessMin = -.1f;
  const float kBrightnessMax = -.01f;

  float ratio = fabs(delta_x) / GetViewBounds().width();
  ratio = std::min(1.f, ratio);
  if (base::i18n::IsRTL())
    ratio = 1.f - ratio;
  float brightness = current_overscroll_gesture_ == OVERSCROLL_WEST ?
      kBrightnessMin + ratio * (kBrightnessMax - kBrightnessMin) :
      kBrightnessMax - ratio * (kBrightnessMax - kBrightnessMin);
  brightness = std::max(kBrightnessMin, brightness);
  brightness = std::min(kBrightnessMax, brightness);
  aura::Window* window = GetWindowToAnimateForOverscroll();
  window->layer()->SetLayerBrightness(brightness);
}

void WebContentsViewAura::AttachTouchEditableToRenderView() {
  if (!touch_editable_)
    return;
  RenderWidgetHostViewAura* rwhva = ToRenderWidgetHostViewAura(
      web_contents_->GetRenderWidgetHostView());
  touch_editable_->AttachToView(rwhva);
}

void WebContentsViewAura::OverscrollUpdateForWebContentsDelegate(int delta_y) {
  if (web_contents_->GetDelegate() && IsScrollEndEffectEnabled())
    web_contents_->GetDelegate()->OverscrollUpdate(delta_y);
}

////////////////////////////////////////////////////////////////////////////////
// WebContentsViewAura, WebContentsView implementation:

gfx::NativeView WebContentsViewAura::GetNativeView() const {
  return window_.get();
}

gfx::NativeView WebContentsViewAura::GetContentNativeView() const {
  RenderWidgetHostView* rwhv = web_contents_->GetRenderWidgetHostView();
  return rwhv ? rwhv->GetNativeView() : NULL;
}

gfx::NativeWindow WebContentsViewAura::GetTopLevelNativeWindow() const {
  return window_->GetToplevelWindow();
}

void WebContentsViewAura::GetContainerBounds(gfx::Rect *out) const {
  *out = window_->GetBoundsInScreen();
}

void WebContentsViewAura::OnTabCrashed(base::TerminationStatus status,
                                       int error_code) {
}

void WebContentsViewAura::SizeContents(const gfx::Size& size) {
  gfx::Rect bounds = window_->bounds();
  if (bounds.size() != size) {
    bounds.set_size(size);
    window_->SetBounds(bounds);
  } else {
    // Our size matches what we want but the renderers size may not match.
    // Pretend we were resized so that the renderers size is updated too.
    SizeChangedCommon(size);
  }
}

void WebContentsViewAura::Focus() {
  if (web_contents_->GetInterstitialPage()) {
    web_contents_->GetInterstitialPage()->Focus();
    return;
  }

  if (delegate_.get() && delegate_->Focus())
    return;

  RenderWidgetHostView* rwhv = web_contents_->GetRenderWidgetHostView();
  if (rwhv)
    rwhv->Focus();
}

void WebContentsViewAura::SetInitialFocus() {
  if (web_contents_->FocusLocationBarByDefault())
    web_contents_->SetFocusToLocationBar(false);
  else
    Focus();
}

void WebContentsViewAura::StoreFocus() {
  if (delegate_)
    delegate_->StoreFocus();
}

void WebContentsViewAura::RestoreFocus() {
  if (delegate_)
    delegate_->RestoreFocus();
}

DropData* WebContentsViewAura::GetDropData() const {
  return current_drop_data_.get();
}

gfx::Rect WebContentsViewAura::GetViewBounds() const {
  return window_->GetBoundsInScreen();
}

////////////////////////////////////////////////////////////////////////////////
// WebContentsViewAura, WebContentsViewPort implementation:

void WebContentsViewAura::CreateView(
    const gfx::Size& initial_size, gfx::NativeView context) {
  // NOTE: we ignore |initial_size| since in some cases it's wrong (such as
  // if the bookmark bar is not shown and you create a new tab). The right
  // value is set shortly after this, so its safe to ignore.

  aura::Env::CreateInstance();
  window_.reset(new aura::Window(this));
  window_->set_owned_by_parent(false);
  window_->SetType(ui::wm::WINDOW_TYPE_CONTROL);
  window_->SetTransparent(false);
  window_->Init(aura::WINDOW_LAYER_NOT_DRAWN);
  aura::Window* root_window = context ? context->GetRootWindow() : NULL;
  if (root_window) {
    // There are places where there is no context currently because object
    // hierarchies are built before they're attached to a Widget. (See
    // views::WebView as an example; GetWidget() returns NULL at the point
    // where we are created.)
    //
    // It should be OK to not set a default parent since such users will
    // explicitly add this WebContentsViewAura to their tree after they create
    // us.
    if (root_window) {
      aura::client::ParentWindowWithContext(
          window_.get(), root_window, root_window->GetBoundsInScreen());
    }
  }
  window_->layer()->SetMasksToBounds(true);
  window_->SetName("WebContentsViewAura");

  // WindowObserver is not interesting and is problematic for Browser Plugin
  // guests.
  // The use cases for WindowObserver do not apply to Browser Plugins:
  // 1) guests do not support NPAPI plugins.
  // 2) guests' window bounds are supposed to come from its embedder.
  if (!web_contents_->GetRenderProcessHost()->IsGuest())
    window_observer_.reset(new WindowObserver(this));

  // delegate_->GetDragDestDelegate() creates a new delegate on every call.
  // Hence, we save a reference to it locally. Similar model is used on other
  // platforms as well.
  if (delegate_)
    drag_dest_delegate_ = delegate_->GetDragDestDelegate();
}

RenderWidgetHostView* WebContentsViewAura::CreateViewForWidget(
    RenderWidgetHost* render_widget_host) {
  if (render_widget_host->GetView()) {
    // During testing, the view will already be set up in most cases to the
    // test view, so we don't want to clobber it with a real one. To verify that
    // this actually is happening (and somebody isn't accidentally creating the
    // view twice), we check for the RVH Factory, which will be set when we're
    // making special ones (which go along with the special views).
    DCHECK(RenderViewHostFactory::has_factory());
    return render_widget_host->GetView();
  }

  RenderWidgetHostView* view =
      RenderWidgetHostView::CreateViewForWidget(render_widget_host);
  view->InitAsChild(NULL);
  GetNativeView()->AddChild(view->GetNativeView());

  if (navigation_overlay_.get() && navigation_overlay_->has_window()) {
    navigation_overlay_->StartObserving();
  }

  RenderWidgetHostImpl* host_impl =
      RenderWidgetHostImpl::From(render_widget_host);

  if (!host_impl->is_hidden())
    view->Show();

  // We listen to drag drop events in the newly created view's window.
  aura::client::SetDragDropDelegate(view->GetNativeView(), this);

  if (host_impl->overscroll_controller() &&
      (!web_contents_->GetDelegate() ||
       web_contents_->GetDelegate()->CanOverscrollContent())) {
    InstallOverscrollControllerDelegate(host_impl);
  }

  AttachTouchEditableToRenderView();
  return view;
}

RenderWidgetHostView* WebContentsViewAura::CreateViewForPopupWidget(
    RenderWidgetHost* render_widget_host) {
  return RenderWidgetHostViewPort::CreateViewForWidget(render_widget_host);
}

void WebContentsViewAura::SetPageTitle(const base::string16& title) {
  window_->set_title(title);
}

void WebContentsViewAura::RenderViewCreated(RenderViewHost* host) {
}

void WebContentsViewAura::RenderViewSwappedIn(RenderViewHost* host) {
  if (navigation_overlay_.get() && navigation_overlay_->has_window())
    navigation_overlay_->StartObserving();
  AttachTouchEditableToRenderView();
}

void WebContentsViewAura::SetOverscrollControllerEnabled(bool enabled) {
  RenderViewHostImpl* host = static_cast<RenderViewHostImpl*>(
      web_contents_->GetRenderViewHost());
  if (host) {
    host->SetOverscrollControllerEnabled(enabled);
    if (enabled)
      InstallOverscrollControllerDelegate(host);
  }

  if (!enabled)
    navigation_overlay_.reset();
  else if (!navigation_overlay_)
    navigation_overlay_.reset(new OverscrollNavigationOverlay(web_contents_));
}

////////////////////////////////////////////////////////////////////////////////
// WebContentsViewAura, RenderViewHostDelegateView implementation:

void WebContentsViewAura::ShowContextMenu(RenderFrameHost* render_frame_host,
                                          const ContextMenuParams& params) {
  if (touch_editable_) {
    touch_editable_->EndTouchEditing(false);
  }
  if (delegate_) {
    delegate_->ShowContextMenu(render_frame_host, params);
    // WARNING: we may have been deleted during the call to ShowContextMenu().
  }
}

void WebContentsViewAura::StartDragging(
    const DropData& drop_data,
    blink::WebDragOperationsMask operations,
    const gfx::ImageSkia& image,
    const gfx::Vector2d& image_offset,
    const DragEventSourceInfo& event_info) {
  aura::Window* root_window = GetNativeView()->GetRootWindow();
  if (!aura::client::GetDragDropClient(root_window)) {
    web_contents_->SystemDragEnded();
    return;
  }

  if (touch_editable_)
    touch_editable_->EndTouchEditing(false);

  ui::OSExchangeData::Provider* provider = ui::OSExchangeData::CreateProvider();
  PrepareDragData(drop_data, provider, web_contents_);

  ui::OSExchangeData data(provider);  // takes ownership of |provider|.

  if (!image.isNull()) {
    drag_utils::SetDragImageOnDataObject(image,
        gfx::Size(image.width(), image.height()), image_offset, &data);
  }

  scoped_ptr<WebDragSourceAura> drag_source(
      new WebDragSourceAura(GetNativeView(), web_contents_));

  // We need to enable recursive tasks on the message loop so we can get
  // updates while in the system DoDragDrop loop.
  int result_op = 0;
  {
    gfx::NativeView content_native_view = GetContentNativeView();
    base::MessageLoop::ScopedNestableTaskAllower allow(
        base::MessageLoop::current());
    result_op = aura::client::GetDragDropClient(root_window)
        ->StartDragAndDrop(data,
                           root_window,
                           content_native_view,
                           event_info.event_location,
                           ConvertFromWeb(operations),
                           event_info.event_source);
  }

  // Bail out immediately if the contents view window is gone. Note that it is
  // not safe to access any class members in this case since |this| may already
  // be destroyed. The local variable |drag_source| will still be valid though,
  // so we can use it to determine if the window is gone.
  if (!drag_source->window()) {
    // Note that in this case, we don't need to call SystemDragEnded() since the
    // renderer is going away.
    return;
  }

  EndDrag(ConvertToWeb(result_op));
  web_contents_->SystemDragEnded();
}

void WebContentsViewAura::UpdateDragCursor(blink::WebDragOperation operation) {
  current_drag_op_ = operation;
}

void WebContentsViewAura::GotFocus() {
  if (web_contents_->GetDelegate())
    web_contents_->GetDelegate()->WebContentsFocused(web_contents_);
}

void WebContentsViewAura::TakeFocus(bool reverse) {
  if (web_contents_->GetDelegate() &&
      !web_contents_->GetDelegate()->TakeFocus(web_contents_, reverse) &&
      delegate_.get()) {
    delegate_->TakeFocus(reverse);
  }
}

////////////////////////////////////////////////////////////////////////////////
// WebContentsViewAura, OverscrollControllerDelegate implementation:

gfx::Rect WebContentsViewAura::GetVisibleBounds() const {
  RenderWidgetHostView* rwhv = web_contents_->GetRenderWidgetHostView();
  if (!rwhv || !rwhv->IsShowing())
    return gfx::Rect();

  return rwhv->GetViewBounds();
}

void WebContentsViewAura::OnOverscrollUpdate(float delta_x, float delta_y) {
  if (current_overscroll_gesture_ == OVERSCROLL_NONE)
    return;

  aura::Window* target = GetWindowToAnimateForOverscroll();
  ui::ScopedLayerAnimationSettings settings(target->layer()->GetAnimator());
  settings.SetPreemptionStrategy(ui::LayerAnimator::IMMEDIATELY_SET_NEW_TARGET);
  gfx::Vector2d translate = GetTranslationForOverscroll(delta_x, delta_y);
  gfx::Transform transform;

  // Vertical overscrolls don't participate in the navigation gesture.
  if (current_overscroll_gesture_ != OVERSCROLL_NORTH &&
      current_overscroll_gesture_ != OVERSCROLL_SOUTH) {
    transform.Translate(translate.x(), translate.y());
    target->SetTransform(transform);
    UpdateOverscrollWindowBrightness(delta_x);
  }

  OverscrollUpdateForWebContentsDelegate(translate.y());
}

void WebContentsViewAura::OnOverscrollComplete(OverscrollMode mode) {
  UMA_HISTOGRAM_ENUMERATION("Overscroll.Completed", mode, OVERSCROLL_COUNT);
  OverscrollUpdateForWebContentsDelegate(0);
  NavigationControllerImpl& controller = web_contents_->GetController();
  if (ShouldNavigateForward(controller, mode) ||
      ShouldNavigateBack(controller, mode)) {
    CompleteOverscrollNavigation(mode);
    return;
  }

  ResetOverscrollTransform();
}

void WebContentsViewAura::OnOverscrollModeChange(OverscrollMode old_mode,
                                                 OverscrollMode new_mode) {
  // Reset any in-progress overscroll animation first.
  ResetOverscrollTransform();

  if (new_mode != OVERSCROLL_NONE && touch_editable_)
    touch_editable_->OverscrollStarted();

  if (new_mode == OVERSCROLL_NONE ||
      !GetContentNativeView() ||
      ((new_mode == OVERSCROLL_EAST || new_mode == OVERSCROLL_WEST) &&
       navigation_overlay_.get() && navigation_overlay_->has_window())) {
    current_overscroll_gesture_ = OVERSCROLL_NONE;
    OverscrollUpdateForWebContentsDelegate(0);
  } else {
    aura::Window* target = GetWindowToAnimateForOverscroll();
    if (target) {
      StopObservingImplicitAnimations();
      target->layer()->GetAnimator()->AbortAllAnimations();
    }
    // Cleanup state of the content window first, because that can reset the
    // value of |current_overscroll_gesture_|.
    PrepareContentWindowForOverscroll();

    current_overscroll_gesture_ = new_mode;
    if (current_overscroll_gesture_ == OVERSCROLL_EAST ||
        current_overscroll_gesture_ == OVERSCROLL_WEST)
      PrepareOverscrollWindow();

    UMA_HISTOGRAM_ENUMERATION("Overscroll.Started", new_mode, OVERSCROLL_COUNT);
  }
  completed_overscroll_gesture_ = OVERSCROLL_NONE;
}

////////////////////////////////////////////////////////////////////////////////
// WebContentsViewAura, ui::ImplicitAnimationObserver implementation:

void WebContentsViewAura::OnImplicitAnimationsCompleted() {
  overscroll_shadow_.reset();

  if (ShouldNavigateForward(web_contents_->GetController(),
                            completed_overscroll_gesture_)) {
    PrepareOverscrollNavigationOverlay();
    web_contents_->GetController().GoForward();
  } else if (ShouldNavigateBack(web_contents_->GetController(),
                                completed_overscroll_gesture_)) {
    PrepareOverscrollNavigationOverlay();
    web_contents_->GetController().GoBack();
  } else {
    if (touch_editable_)
      touch_editable_->OverscrollCompleted();
  }

  aura::Window* content = GetContentNativeView();
  if (content) {
    content->SetTransform(gfx::Transform());
    content->layer()->SetLayerBrightness(0.f);
  }
  current_overscroll_gesture_ = OVERSCROLL_NONE;
  completed_overscroll_gesture_ = OVERSCROLL_NONE;
  overscroll_window_.reset();
}

////////////////////////////////////////////////////////////////////////////////
// WebContentsViewAura, aura::WindowDelegate implementation:

gfx::Size WebContentsViewAura::GetMinimumSize() const {
  return gfx::Size();
}

gfx::Size WebContentsViewAura::GetMaximumSize() const {
  return gfx::Size();
}

void WebContentsViewAura::OnBoundsChanged(const gfx::Rect& old_bounds,
                                          const gfx::Rect& new_bounds) {
  SizeChangedCommon(new_bounds.size());
  if (delegate_)
    delegate_->SizeChanged(new_bounds.size());

  // Constrained web dialogs, need to be kept centered over our content area.
  for (size_t i = 0; i < window_->children().size(); i++) {
    if (window_->children()[i]->GetProperty(
            aura::client::kConstrainedWindowKey)) {
      gfx::Rect bounds = window_->children()[i]->bounds();
      bounds.set_origin(
          gfx::Point((new_bounds.width() - bounds.width()) / 2,
                     (new_bounds.height() - bounds.height()) / 2));
      window_->children()[i]->SetBounds(bounds);
    }
  }
}

gfx::NativeCursor WebContentsViewAura::GetCursor(const gfx::Point& point) {
  return gfx::kNullCursor;
}

int WebContentsViewAura::GetNonClientComponent(const gfx::Point& point) const {
  return HTCLIENT;
}

bool WebContentsViewAura::ShouldDescendIntoChildForEventHandling(
    aura::Window* child,
    const gfx::Point& location) {
  return true;
}

bool WebContentsViewAura::CanFocus() {
  // Do not take the focus if the render widget host view aura is gone or
  // is in the process of shutting down because neither the view window nor
  // this window can handle key events.
  RenderWidgetHostViewAura* view = ToRenderWidgetHostViewAura(
      web_contents_->GetRenderWidgetHostView());
  if (view != NULL && !view->IsClosing())
    return true;

  return false;
}

void WebContentsViewAura::OnCaptureLost() {
}

void WebContentsViewAura::OnPaint(gfx::Canvas* canvas) {
}

void WebContentsViewAura::OnDeviceScaleFactorChanged(
    float device_scale_factor) {
}

void WebContentsViewAura::OnWindowDestroying(aura::Window* window) {
  // This means the destructor is going to be called soon. If there is an
  // overscroll gesture in progress (i.e. |overscroll_window_| is not NULL),
  // then destroying it in the WebContentsViewAura destructor can trigger other
  // virtual functions to be called (e.g. OnImplicitAnimationsCompleted()). So
  // destroy the overscroll window here.
  navigation_overlay_.reset();
  overscroll_window_.reset();
}

void WebContentsViewAura::OnWindowDestroyed(aura::Window* window) {
}

void WebContentsViewAura::OnWindowTargetVisibilityChanged(bool visible) {
  if (visible)
    web_contents_->WasShown();
  else
    web_contents_->WasHidden();
}

bool WebContentsViewAura::HasHitTestMask() const {
  return false;
}

void WebContentsViewAura::GetHitTestMask(gfx::Path* mask) const {
}

////////////////////////////////////////////////////////////////////////////////
// WebContentsViewAura, ui::EventHandler implementation:

void WebContentsViewAura::OnKeyEvent(ui::KeyEvent* event) {
}

void WebContentsViewAura::OnMouseEvent(ui::MouseEvent* event) {
  if (!web_contents_->GetDelegate())
    return;

  switch (event->type()) {
    case ui::ET_MOUSE_PRESSED:
      web_contents_->GetDelegate()->ActivateContents(web_contents_);
      break;
    case ui::ET_MOUSE_MOVED:
    case ui::ET_MOUSE_EXITED:
      web_contents_->GetDelegate()->ContentsMouseEvent(
          web_contents_,
          gfx::Screen::GetScreenFor(GetNativeView())->GetCursorScreenPoint(),
          event->type() == ui::ET_MOUSE_MOVED);
      break;
    default:
      break;
  }
}

////////////////////////////////////////////////////////////////////////////////
// WebContentsViewAura, aura::client::DragDropDelegate implementation:

void WebContentsViewAura::OnDragEntered(const ui::DropTargetEvent& event) {
  if (drag_dest_delegate_)
    drag_dest_delegate_->DragInitialize(web_contents_);

  current_drop_data_.reset(new DropData());

  PrepareDropData(current_drop_data_.get(), event.data());
  blink::WebDragOperationsMask op = ConvertToWeb(event.source_operations());

  gfx::Point screen_pt =
      gfx::Screen::GetScreenFor(GetNativeView())->GetCursorScreenPoint();
  current_rvh_for_drag_ = web_contents_->GetRenderViewHost();
  web_contents_->GetRenderViewHost()->DragTargetDragEnter(
      *current_drop_data_.get(), event.location(), screen_pt, op,
      ConvertAuraEventFlagsToWebInputEventModifiers(event.flags()));

  if (drag_dest_delegate_) {
    drag_dest_delegate_->OnReceiveDragData(event.data());
    drag_dest_delegate_->OnDragEnter();
  }
}

int WebContentsViewAura::OnDragUpdated(const ui::DropTargetEvent& event) {
  DCHECK(current_rvh_for_drag_);
  if (current_rvh_for_drag_ != web_contents_->GetRenderViewHost())
    OnDragEntered(event);

  blink::WebDragOperationsMask op = ConvertToWeb(event.source_operations());
  gfx::Point screen_pt =
      gfx::Screen::GetScreenFor(GetNativeView())->GetCursorScreenPoint();
  web_contents_->GetRenderViewHost()->DragTargetDragOver(
      event.location(), screen_pt, op,
      ConvertAuraEventFlagsToWebInputEventModifiers(event.flags()));

  if (drag_dest_delegate_)
    drag_dest_delegate_->OnDragOver();

  return ConvertFromWeb(current_drag_op_);
}

void WebContentsViewAura::OnDragExited() {
  DCHECK(current_rvh_for_drag_);
  if (current_rvh_for_drag_ != web_contents_->GetRenderViewHost())
    return;

  web_contents_->GetRenderViewHost()->DragTargetDragLeave();
  if (drag_dest_delegate_)
    drag_dest_delegate_->OnDragLeave();

  current_drop_data_.reset();
}

int WebContentsViewAura::OnPerformDrop(const ui::DropTargetEvent& event) {
  DCHECK(current_rvh_for_drag_);
  if (current_rvh_for_drag_ != web_contents_->GetRenderViewHost())
    OnDragEntered(event);

  web_contents_->GetRenderViewHost()->DragTargetDrop(
      event.location(),
      gfx::Screen::GetScreenFor(GetNativeView())->GetCursorScreenPoint(),
      ConvertAuraEventFlagsToWebInputEventModifiers(event.flags()));
  if (drag_dest_delegate_)
    drag_dest_delegate_->OnDrop();
  current_drop_data_.reset();
  return ConvertFromWeb(current_drag_op_);
}

}  // namespace content
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root/content/browser/web_contents/web_contents_view_aura.cc

DEFINITIONS
