content/renderer/browser_plugin/browser

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This source file includes following definitions.
GetInternalEventName
weak_ptr_factory_
FromContainer
OnMessageReceived
UpdateDOMAttribute
RemoveDOMAttribute
GetDOMAttributeValue
HasDOMAttribute
GetNameAttribute
GetAllowTransparencyAttribute
GetSrcAttribute
GetAutoSizeAttribute
GetMaxHeightAttribute
GetMaxWidthAttribute
GetMinHeightAttribute
GetMinWidthAttribute
GetAdjustedMaxHeight
GetAdjustedMaxWidth
GetAdjustedMinHeight
GetAdjustedMinWidth
GetPartitionAttribute
ParseNameAttribute
ParseAllowTransparencyAttribute
ParseSrcAttribute
ParseAutoSizeAttribute
PopulateAutoSizeParameters
UpdateGuestAutoSizeState
UsesDamageBuffer
UsesPendingDamageBuffer
OnInstanceIDAllocated
Attach
DidCommitCompositorFrame
OnAdvanceFocus
OnAttachACK
OnBuffersSwapped
OnCompositorFrameSwapped
OnCopyFromCompositingSurface
OnGuestContentWindowReady
OnGuestGone
OnSetCursor
OnSetMouseLock
OnShouldAcceptTouchEvents
OnUpdatedName
OnUpdateRect
ParseSizeContraintsChanged
InAutoSizeBounds
GetContentWindow
AttachWindowTo
HasNavigated
HasGuestInstanceID
ParsePartitionAttribute
CanRemovePartitionAttribute
ShowSadGraphic
ParseAttributes
GetDeviceScaleFactor
UpdateDeviceScaleFactor
TriggerEvent
UpdateGuestFocusState
ShouldGuestBeFocused
container
initialize
EnableCompositing
destroy
scriptableObject
pluginNPP
supportsKeyboardFocus
supportsEditCommands
supportsInputMethod
canProcessDrag
paint
ShouldForwardToBrowserPlugin
updateGeometry
SwapDamageBuffers
PopulateResizeGuestParameters
GetDamageBufferWithSizeParams
CreateDamageBuffer
CreateDamageBuffer
updateFocus
updateVisibility
acceptsInputEvents
handleInputEvent
handleDragStatusUpdate
didReceiveResponse
didReceiveData
didFinishLoading
didFailLoading
didFinishLoadingFrameRequest
didFailLoadingFrameRequest
executeEditCommand
executeEditCommand
setComposition
confirmComposition
extendSelectionAndDelete
OnLockMouseACK
OnMouseLockLost
HandleMouseLockedInputEvent
// Copyright 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/renderer/browser_plugin/browser_plugin.h"

#include "base/command_line.h"
#include "base/json/json_string_value_serializer.h"
#include "base/message_loop/message_loop.h"
#include "base/strings/string_number_conversions.h"
#include "base/strings/string_util.h"
#include "base/strings/utf_string_conversions.h"
#include "content/common/browser_plugin/browser_plugin_constants.h"
#include "content/common/browser_plugin/browser_plugin_messages.h"
#include "content/common/view_messages.h"
#include "content/public/common/content_client.h"
#include "content/public/common/content_switches.h"
#include "content/public/renderer/content_renderer_client.h"
#include "content/renderer/browser_plugin/browser_plugin_bindings.h"
#include "content/renderer/browser_plugin/browser_plugin_manager.h"
#include "content/renderer/child_frame_compositing_helper.h"
#include "content/renderer/cursor_utils.h"
#include "content/renderer/drop_data_builder.h"
#include "content/renderer/render_process_impl.h"
#include "content/renderer/render_thread_impl.h"
#include "content/renderer/sad_plugin.h"
#include "content/renderer/v8_value_converter_impl.h"
#include "skia/ext/platform_canvas.h"
#include "third_party/WebKit/public/platform/WebRect.h"
#include "third_party/WebKit/public/web/WebBindings.h"
#include "third_party/WebKit/public/web/WebDOMCustomEvent.h"
#include "third_party/WebKit/public/web/WebDocument.h"
#include "third_party/WebKit/public/web/WebElement.h"
#include "third_party/WebKit/public/web/WebFrame.h"
#include "third_party/WebKit/public/web/WebInputEvent.h"
#include "third_party/WebKit/public/web/WebPluginContainer.h"
#include "third_party/WebKit/public/web/WebPluginParams.h"
#include "third_party/WebKit/public/web/WebScriptSource.h"
#include "third_party/WebKit/public/web/WebView.h"
#include "ui/events/keycodes/keyboard_codes.h"

#if defined (OS_WIN)
#include "base/sys_info.h"
#endif

using blink::WebCanvas;
using blink::WebPluginContainer;
using blink::WebPluginParams;
using blink::WebPoint;
using blink::WebRect;
using blink::WebURL;
using blink::WebVector;

namespace content {

namespace {

static std::string GetInternalEventName(const char* event_name) {
  return base::StringPrintf("-internal-%s", event_name);
}

typedef std::map<blink::WebPluginContainer*,
                 BrowserPlugin*> PluginContainerMap;
static base::LazyInstance<PluginContainerMap> g_plugin_container_map =
    LAZY_INSTANCE_INITIALIZER;

}  // namespace

BrowserPlugin::BrowserPlugin(RenderViewImpl* render_view,
                             blink::WebFrame* frame)
    : guest_instance_id_(browser_plugin::kInstanceIDNone),
      attached_(false),
      render_view_(render_view->AsWeakPtr()),
      render_view_routing_id_(render_view->GetRoutingID()),
      container_(NULL),
      damage_buffer_sequence_id_(0),
      paint_ack_received_(true),
      last_device_scale_factor_(1.0f),
      sad_guest_(NULL),
      guest_crashed_(false),
      is_auto_size_state_dirty_(false),
      persist_storage_(false),
      valid_partition_id_(true),
      content_window_routing_id_(MSG_ROUTING_NONE),
      plugin_focused_(false),
      visible_(true),
      before_first_navigation_(true),
      mouse_locked_(false),
      browser_plugin_manager_(render_view->GetBrowserPluginManager()),
      compositing_enabled_(false),
      embedder_frame_url_(frame->document().url()),
      weak_ptr_factory_(this) {
}

BrowserPlugin::~BrowserPlugin() {
  // If the BrowserPlugin has never navigated then the browser process and
  // BrowserPluginManager don't know about it and so there is nothing to do
  // here.
  if (!HasGuestInstanceID())
    return;
  browser_plugin_manager()->RemoveBrowserPlugin(guest_instance_id_);
  browser_plugin_manager()->Send(
      new BrowserPluginHostMsg_PluginDestroyed(render_view_routing_id_,
                                               guest_instance_id_));
}

/*static*/
BrowserPlugin* BrowserPlugin::FromContainer(
    blink::WebPluginContainer* container) {
  PluginContainerMap* browser_plugins = g_plugin_container_map.Pointer();
  PluginContainerMap::iterator it = browser_plugins->find(container);
  return it == browser_plugins->end() ? NULL : it->second;
}

bool BrowserPlugin::OnMessageReceived(const IPC::Message& message) {
  bool handled = true;
  IPC_BEGIN_MESSAGE_MAP(BrowserPlugin, message)
    IPC_MESSAGE_HANDLER(BrowserPluginMsg_AdvanceFocus, OnAdvanceFocus)
    IPC_MESSAGE_HANDLER(BrowserPluginMsg_Attach_ACK, OnAttachACK)
    IPC_MESSAGE_HANDLER(BrowserPluginMsg_BuffersSwapped, OnBuffersSwapped)
    IPC_MESSAGE_HANDLER_GENERIC(BrowserPluginMsg_CompositorFrameSwapped,
                                OnCompositorFrameSwapped(message))
    IPC_MESSAGE_HANDLER(BrowserPluginMsg_CopyFromCompositingSurface,
                        OnCopyFromCompositingSurface)
    IPC_MESSAGE_HANDLER(BrowserPluginMsg_GuestContentWindowReady,
                        OnGuestContentWindowReady)
    IPC_MESSAGE_HANDLER(BrowserPluginMsg_GuestGone, OnGuestGone)
    IPC_MESSAGE_HANDLER(BrowserPluginMsg_SetCursor, OnSetCursor)
    IPC_MESSAGE_HANDLER(BrowserPluginMsg_SetMouseLock, OnSetMouseLock)
    IPC_MESSAGE_HANDLER(BrowserPluginMsg_ShouldAcceptTouchEvents,
                        OnShouldAcceptTouchEvents)
    IPC_MESSAGE_HANDLER(BrowserPluginMsg_UpdatedName, OnUpdatedName)
    IPC_MESSAGE_HANDLER(BrowserPluginMsg_UpdateRect, OnUpdateRect)
    IPC_MESSAGE_UNHANDLED(handled = false)
  IPC_END_MESSAGE_MAP()
  return handled;
}

void BrowserPlugin::UpdateDOMAttribute(const std::string& attribute_name,
                                       const std::string& attribute_value) {
  if (!container())
    return;

  blink::WebElement element = container()->element();
  blink::WebString web_attribute_name =
      blink::WebString::fromUTF8(attribute_name);
  if (!HasDOMAttribute(attribute_name) ||
      (std::string(element.getAttribute(web_attribute_name).utf8()) !=
          attribute_value)) {
    element.setAttribute(web_attribute_name,
        blink::WebString::fromUTF8(attribute_value));
  }
}

void BrowserPlugin::RemoveDOMAttribute(const std::string& attribute_name) {
  if (!container())
    return;

  container()->element().removeAttribute(
      blink::WebString::fromUTF8(attribute_name));
}

std::string BrowserPlugin::GetDOMAttributeValue(
    const std::string& attribute_name) const {
  if (!container())
    return std::string();

  return container()->element().getAttribute(
      blink::WebString::fromUTF8(attribute_name)).utf8();
}

bool BrowserPlugin::HasDOMAttribute(const std::string& attribute_name) const {
  if (!container())
    return false;

  return container()->element().hasAttribute(
      blink::WebString::fromUTF8(attribute_name));
}

std::string BrowserPlugin::GetNameAttribute() const {
  return GetDOMAttributeValue(browser_plugin::kAttributeName);
}

bool BrowserPlugin::GetAllowTransparencyAttribute() const {
  return HasDOMAttribute(browser_plugin::kAttributeAllowTransparency);
}

std::string BrowserPlugin::GetSrcAttribute() const {
  return GetDOMAttributeValue(browser_plugin::kAttributeSrc);
}

bool BrowserPlugin::GetAutoSizeAttribute() const {
  return HasDOMAttribute(browser_plugin::kAttributeAutoSize);
}

int BrowserPlugin::GetMaxHeightAttribute() const {
  int max_height;
  base::StringToInt(GetDOMAttributeValue(browser_plugin::kAttributeMaxHeight),
                    &max_height);
  return max_height;
}

int BrowserPlugin::GetMaxWidthAttribute() const {
  int max_width;
  base::StringToInt(GetDOMAttributeValue(browser_plugin::kAttributeMaxWidth),
                    &max_width);
  return max_width;
}

int BrowserPlugin::GetMinHeightAttribute() const {
  int min_height;
  base::StringToInt(GetDOMAttributeValue(browser_plugin::kAttributeMinHeight),
                    &min_height);
  return min_height;
}

int BrowserPlugin::GetMinWidthAttribute() const {
  int min_width;
  base::StringToInt(GetDOMAttributeValue(browser_plugin::kAttributeMinWidth),
                    &min_width);
  return min_width;
}

int BrowserPlugin::GetAdjustedMaxHeight() const {
  int max_height = GetMaxHeightAttribute();
  return max_height ? max_height : height();
}

int BrowserPlugin::GetAdjustedMaxWidth() const {
  int max_width = GetMaxWidthAttribute();
  return max_width ? max_width : width();
}

int BrowserPlugin::GetAdjustedMinHeight() const {
  int min_height = GetMinHeightAttribute();
  // FrameView.cpp does not allow this value to be <= 0, so when the value is
  // unset (or set to 0), we set it to the container size.
  min_height = min_height ? min_height : height();
  // For autosize, minHeight should not be bigger than maxHeight.
  return std::min(min_height, GetAdjustedMaxHeight());
}

int BrowserPlugin::GetAdjustedMinWidth() const {
  int min_width = GetMinWidthAttribute();
  // FrameView.cpp does not allow this value to be <= 0, so when the value is
  // unset (or set to 0), we set it to the container size.
  min_width = min_width ? min_width : width();
  // For autosize, minWidth should not be bigger than maxWidth.
  return std::min(min_width, GetAdjustedMaxWidth());
}

std::string BrowserPlugin::GetPartitionAttribute() const {
  return GetDOMAttributeValue(browser_plugin::kAttributePartition);
}

void BrowserPlugin::ParseNameAttribute() {
  if (!HasGuestInstanceID())
    return;
  browser_plugin_manager()->Send(
      new BrowserPluginHostMsg_SetName(render_view_routing_id_,
                                       guest_instance_id_,
                                       GetNameAttribute()));
}

void BrowserPlugin::ParseAllowTransparencyAttribute() {
  if (!HasGuestInstanceID())
    return;

  bool opaque = !GetAllowTransparencyAttribute();

  if (compositing_helper_)
    compositing_helper_->SetContentsOpaque(opaque);

  browser_plugin_manager()->Send(new BrowserPluginHostMsg_SetContentsOpaque(
        render_view_routing_id_,
        guest_instance_id_,
        opaque));
}

bool BrowserPlugin::ParseSrcAttribute(std::string* error_message) {
  if (!valid_partition_id_) {
    *error_message = browser_plugin::kErrorInvalidPartition;
    return false;
  }
  std::string src = GetSrcAttribute();
  if (src.empty())
    return true;

  // If we haven't created the guest yet, do so now. We will navigate it right
  // after creation. If |src| is empty, we can delay the creation until we
  // actually need it.
  if (!HasGuestInstanceID()) {
    // On initial navigation, we request an instance ID from the browser
    // process. We essentially ignore all subsequent calls to SetSrcAttribute
    // until we receive an instance ID. |before_first_navigation_|
    // prevents BrowserPlugin from allocating more than one instance ID.
    // Upon receiving an instance ID from the browser process, we continue
    // the process of navigation by populating the
    // BrowserPluginHostMsg_Attach_Params with the current state of
    // BrowserPlugin and sending a BrowserPluginHostMsg_CreateGuest to the
    // browser process in order to create a new guest.
    if (before_first_navigation_) {
      browser_plugin_manager()->AllocateInstanceID(
          weak_ptr_factory_.GetWeakPtr());
      before_first_navigation_ = false;
    }
    return true;
  }

  browser_plugin_manager()->Send(
      new BrowserPluginHostMsg_NavigateGuest(render_view_routing_id_,
                                             guest_instance_id_,
                                             src));
  return true;
}

void BrowserPlugin::ParseAutoSizeAttribute() {
  last_view_size_ = plugin_rect_.size();
  is_auto_size_state_dirty_ = true;
  UpdateGuestAutoSizeState(GetAutoSizeAttribute());
}

void BrowserPlugin::PopulateAutoSizeParameters(
    BrowserPluginHostMsg_AutoSize_Params* params, bool auto_size_enabled) {
  params->enable = auto_size_enabled;
  // No need to populate the params if autosize is off.
  if (auto_size_enabled) {
    params->max_size = gfx::Size(GetAdjustedMaxWidth(), GetAdjustedMaxHeight());
    params->min_size = gfx::Size(GetAdjustedMinWidth(), GetAdjustedMinHeight());

    if (max_auto_size_ != params->max_size)
      is_auto_size_state_dirty_ = true;

    max_auto_size_ = params->max_size;
  } else {
    max_auto_size_ = gfx::Size();
  }
}

void BrowserPlugin::UpdateGuestAutoSizeState(bool auto_size_enabled) {
  // If we haven't yet heard back from the guest about the last resize request,
  // then we don't issue another request until we do in
  // BrowserPlugin::UpdateRect.
  if (!HasGuestInstanceID() || !paint_ack_received_)
    return;

  BrowserPluginHostMsg_AutoSize_Params auto_size_params;
  BrowserPluginHostMsg_ResizeGuest_Params resize_guest_params;
  if (auto_size_enabled) {
    GetDamageBufferWithSizeParams(&auto_size_params,
                                  &resize_guest_params,
                                  true);
  } else {
    GetDamageBufferWithSizeParams(NULL, &resize_guest_params, true);
  }
  paint_ack_received_ = false;
  browser_plugin_manager()->Send(
      new BrowserPluginHostMsg_SetAutoSize(render_view_routing_id_,
                                           guest_instance_id_,
                                           auto_size_params,
                                           resize_guest_params));
}

// static
bool BrowserPlugin::UsesDamageBuffer(
    const BrowserPluginMsg_UpdateRect_Params& params) {
  return params.damage_buffer_sequence_id != 0 || params.needs_ack;
}

bool BrowserPlugin::UsesPendingDamageBuffer(
    const BrowserPluginMsg_UpdateRect_Params& params) {
  if (!pending_damage_buffer_)
    return false;
  return damage_buffer_sequence_id_ == params.damage_buffer_sequence_id;
}

void BrowserPlugin::OnInstanceIDAllocated(int guest_instance_id) {
  CHECK(guest_instance_id != browser_plugin::kInstanceIDNone);
  before_first_navigation_ = false;
  guest_instance_id_ = guest_instance_id;
  browser_plugin_manager()->AddBrowserPlugin(guest_instance_id, this);

  std::map<std::string, base::Value*> props;
  props[browser_plugin::kWindowID] =
      new base::FundamentalValue(guest_instance_id);
  TriggerEvent(browser_plugin::kEventInternalInstanceIDAllocated, &props);
}

void BrowserPlugin::Attach(scoped_ptr<base::DictionaryValue> extra_params) {
  BrowserPluginHostMsg_Attach_Params attach_params;
  attach_params.focused = ShouldGuestBeFocused();
  attach_params.visible = visible_;
  attach_params.opaque = !GetAllowTransparencyAttribute();
  attach_params.name = GetNameAttribute();
  attach_params.storage_partition_id = storage_partition_id_;
  attach_params.persist_storage = persist_storage_;
  attach_params.src = GetSrcAttribute();
  attach_params.embedder_frame_url = embedder_frame_url_;
  GetDamageBufferWithSizeParams(&attach_params.auto_size_params,
                                &attach_params.resize_guest_params,
                                false);

  browser_plugin_manager()->Send(
      new BrowserPluginHostMsg_Attach(render_view_routing_id_,
                                      guest_instance_id_, attach_params,
                                      *extra_params));
}

void BrowserPlugin::DidCommitCompositorFrame() {
  if (compositing_helper_.get())
    compositing_helper_->DidCommitCompositorFrame();
}

void BrowserPlugin::OnAdvanceFocus(int guest_instance_id, bool reverse) {
  DCHECK(render_view_.get());
  render_view_->GetWebView()->advanceFocus(reverse);
}

void BrowserPlugin::OnAttachACK(
    int guest_instance_id,
    const BrowserPluginMsg_Attach_ACK_Params& params) {
  // Update BrowserPlugin attributes to match the state of the guest.
  if (!params.name.empty())
    OnUpdatedName(guest_instance_id, params.name);
  if (!params.storage_partition_id.empty()) {
    std::string partition_name =
        (params.persist_storage ? browser_plugin::kPersistPrefix : "") +
            params.storage_partition_id;
    UpdateDOMAttribute(browser_plugin::kAttributePartition, partition_name);
  }
  attached_ = true;
}

void BrowserPlugin::OnBuffersSwapped(
    int instance_id,
    const FrameMsg_BuffersSwapped_Params& params) {
  EnableCompositing(true);

  compositing_helper_->OnBuffersSwapped(params.size,
                                        params.mailbox,
                                        params.gpu_route_id,
                                        params.gpu_host_id,
                                        GetDeviceScaleFactor());
}

void BrowserPlugin::OnCompositorFrameSwapped(const IPC::Message& message) {
  BrowserPluginMsg_CompositorFrameSwapped::Param param;
  if (!BrowserPluginMsg_CompositorFrameSwapped::Read(&message, &param))
    return;
  scoped_ptr<cc::CompositorFrame> frame(new cc::CompositorFrame);
  param.b.frame.AssignTo(frame.get());

  EnableCompositing(true);
  compositing_helper_->OnCompositorFrameSwapped(frame.Pass(),
                                                param.b.producing_route_id,
                                                param.b.output_surface_id,
                                                param.b.producing_host_id);
}

void BrowserPlugin::OnCopyFromCompositingSurface(int guest_instance_id,
                                                 int request_id,
                                                 gfx::Rect source_rect,
                                                 gfx::Size dest_size) {
  if (!compositing_enabled_) {
    browser_plugin_manager()->Send(
        new BrowserPluginHostMsg_CopyFromCompositingSurfaceAck(
            render_view_routing_id_,
            guest_instance_id_,
            request_id,
            SkBitmap()));
    return;
  }
  compositing_helper_->CopyFromCompositingSurface(request_id, source_rect,
                                                  dest_size);
}

void BrowserPlugin::OnGuestContentWindowReady(int guest_instance_id,
                                              int content_window_routing_id) {
  DCHECK(content_window_routing_id != MSG_ROUTING_NONE);
  content_window_routing_id_ = content_window_routing_id;
}

void BrowserPlugin::OnGuestGone(int guest_instance_id) {
  guest_crashed_ = true;

  // Turn off compositing so we can display the sad graphic. Changes to
  // compositing state will show up at a later time after a layout and commit.
  EnableCompositing(false);
  if (compositing_helper_) {
    compositing_helper_->OnContainerDestroy();
    compositing_helper_ = NULL;
  }

  // Queue up showing the sad graphic to give content embedders an opportunity
  // to fire their listeners and potentially overlay the webview with custom
  // behavior. If the BrowserPlugin is destroyed in the meantime, then the
  // task will not be executed.
  base::MessageLoop::current()->PostTask(
      FROM_HERE,
      base::Bind(&BrowserPlugin::ShowSadGraphic,
                 weak_ptr_factory_.GetWeakPtr()));
}

void BrowserPlugin::OnSetCursor(int guest_instance_id,
                                const WebCursor& cursor) {
  cursor_ = cursor;
}

void BrowserPlugin::OnSetMouseLock(int guest_instance_id,
                                   bool enable) {
  if (enable) {
    if (mouse_locked_)
      return;
    render_view_->mouse_lock_dispatcher()->LockMouse(this);
  } else {
    if (!mouse_locked_) {
      OnLockMouseACK(false);
      return;
    }
    render_view_->mouse_lock_dispatcher()->UnlockMouse(this);
  }
}

void BrowserPlugin::OnShouldAcceptTouchEvents(int guest_instance_id,
                                              bool accept) {
  if (container()) {
    container()->requestTouchEventType(accept ?
        blink::WebPluginContainer::TouchEventRequestTypeRaw :
        blink::WebPluginContainer::TouchEventRequestTypeNone);
  }
}

void BrowserPlugin::OnUpdatedName(int guest_instance_id,
                                  const std::string& name) {
  UpdateDOMAttribute(browser_plugin::kAttributeName, name);
}

void BrowserPlugin::OnUpdateRect(
    int guest_instance_id,
    const BrowserPluginMsg_UpdateRect_Params& params) {
  // If the guest has updated pixels then it is no longer crashed.
  guest_crashed_ = false;

  bool use_new_damage_buffer = !backing_store_;
  BrowserPluginHostMsg_AutoSize_Params auto_size_params;
  BrowserPluginHostMsg_ResizeGuest_Params resize_guest_params;
  // If we have a pending damage buffer, and the guest has begun to use the
  // damage buffer then we know the guest will no longer use the current
  // damage buffer. At this point, we drop the current damage buffer, and
  // mark the pending damage buffer as the current damage buffer.
  if (UsesPendingDamageBuffer(params)) {
    SwapDamageBuffers();
    use_new_damage_buffer = true;
  }

  bool auto_size = GetAutoSizeAttribute();
  // We receive a resize ACK in regular mode, but not in autosize.
  // In SW, |paint_ack_received_| is reset in SwapDamageBuffers().
  // In HW mode, we need to do it here so we can continue sending
  // resize messages when needed.
  if (params.is_resize_ack ||
      (!params.needs_ack && (auto_size || is_auto_size_state_dirty_))) {
    paint_ack_received_ = true;
  }

  bool was_auto_size_state_dirty = auto_size && is_auto_size_state_dirty_;
  is_auto_size_state_dirty_ = false;

  if ((!auto_size && (width() != params.view_size.width() ||
                      height() != params.view_size.height())) ||
      (auto_size && was_auto_size_state_dirty) ||
      GetDeviceScaleFactor() != params.scale_factor) {
    // We are HW accelerated, render widget does not expect an ack,
    // but we still need to update the size.
    if (!params.needs_ack) {
      UpdateGuestAutoSizeState(auto_size);
      return;
    }

    if (!paint_ack_received_) {
      // The guest has not yet responded to the last resize request, and
      // so we don't want to do anything at this point other than ACK the guest.
      if (auto_size)
        PopulateAutoSizeParameters(&auto_size_params, auto_size);
    } else {
      // If we have no pending damage buffer, then the guest has not caught up
      // with the BrowserPlugin container. We now tell the guest about the new
      // container size.
      if (auto_size) {
        GetDamageBufferWithSizeParams(&auto_size_params,
                                      &resize_guest_params,
                                      was_auto_size_state_dirty);
      } else {
        GetDamageBufferWithSizeParams(NULL,
                                      &resize_guest_params,
                                      was_auto_size_state_dirty);
      }
    }
    browser_plugin_manager()->Send(new BrowserPluginHostMsg_UpdateRect_ACK(
        render_view_routing_id_,
        guest_instance_id_,
        true,
        auto_size_params,
        resize_guest_params));
    return;
  }

  if (auto_size && (params.view_size != last_view_size_)) {
    if (backing_store_)
      backing_store_->Clear(SK_ColorWHITE);
    last_view_size_ = params.view_size;
  }

  if (UsesDamageBuffer(params)) {

    // If we are seeing damage buffers, HW compositing should be turned off.
    EnableCompositing(false);

    // If we are now using a new damage buffer, then that means that the guest
    // has updated its size state in response to a resize request. We change
    // the backing store's size to accomodate the new damage buffer size.
    if (use_new_damage_buffer) {
      int backing_store_width = auto_size ? GetAdjustedMaxWidth() : width();
      int backing_store_height = auto_size ? GetAdjustedMaxHeight(): height();
      backing_store_.reset(
          new BrowserPluginBackingStore(
              gfx::Size(backing_store_width, backing_store_height),
              params.scale_factor));
    }

    // If we just transitioned from the compositing path to the software path
    // then we might not yet have a damage buffer.
    if (current_damage_buffer_) {
      // Update the backing store.
      if (!params.scroll_rect.IsEmpty()) {
        backing_store_->ScrollBackingStore(params.scroll_delta,
                                          params.scroll_rect,
                                          params.view_size);
      }
      backing_store_->PaintToBackingStore(params.bitmap_rect,
                                          params.copy_rects,
                                          current_damage_buffer_->memory());
      // Invalidate the container.
      // If the BrowserPlugin is scheduled to be deleted, then container_ will
      // be NULL so we shouldn't attempt to access it.
      if (container_)
        container_->invalidate();
    }
  }

  // BrowserPluginHostMsg_UpdateRect_ACK is used by both the compositing and
  // software paths to piggyback updated autosize parameters.
  if (auto_size)
    PopulateAutoSizeParameters(&auto_size_params, auto_size);
  browser_plugin_manager()->Send(new BrowserPluginHostMsg_UpdateRect_ACK(
      render_view_routing_id_,
      guest_instance_id_,
      UsesDamageBuffer(params),
      auto_size_params,
      resize_guest_params));
}

void BrowserPlugin::ParseSizeContraintsChanged() {
  bool auto_size = GetAutoSizeAttribute();
  if (auto_size) {
    is_auto_size_state_dirty_ = true;
    UpdateGuestAutoSizeState(true);
  }
}

bool BrowserPlugin::InAutoSizeBounds(const gfx::Size& size) const {
  return size.width() <= GetAdjustedMaxWidth() &&
      size.height() <= GetAdjustedMaxHeight();
}

NPObject* BrowserPlugin::GetContentWindow() const {
  if (content_window_routing_id_ == MSG_ROUTING_NONE)
    return NULL;
  RenderViewImpl* guest_render_view = RenderViewImpl::FromRoutingID(
      content_window_routing_id_);
  if (!guest_render_view)
    return NULL;
  blink::WebFrame* guest_frame = guest_render_view->GetWebView()->mainFrame();
  return guest_frame->windowObject();
}

// static
bool BrowserPlugin::AttachWindowTo(const blink::WebNode& node, int window_id) {
  if (node.isNull())
    return false;

  if (!node.isElementNode())
    return false;

  blink::WebElement shim_element = node.toConst<blink::WebElement>();
  // The shim containing the BrowserPlugin must be attached to a document.
  if (shim_element.document().isNull())
    return false;

  blink::WebNode shadow_root = shim_element.shadowRoot();
  if (shadow_root.isNull() || !shadow_root.hasChildNodes())
    return false;

  blink::WebNode plugin_element = shadow_root.firstChild();
  blink::WebPluginContainer* plugin_container =
      plugin_element.pluginContainer();
  if (!plugin_container)
    return false;

  BrowserPlugin* browser_plugin =
      BrowserPlugin::FromContainer(plugin_container);
  if (!browser_plugin)
    return false;

  // If the BrowserPlugin has already begun to navigate then we shouldn't allow
  // attaching a different guest.
  //
  // Navigation happens in two stages.
  // 1. BrowserPlugin requests an instance ID from the browser process.
  // 2. The browser process returns an instance ID and BrowserPlugin is
  //    "Attach"ed to that instance ID.
  // If the instance ID is new then a new guest will be created.
  // If the instance ID corresponds to an unattached guest then BrowserPlugin
  // is attached to that guest.
  //
  // Between step 1, and step 2, BrowserPlugin::AttachWindowTo may be called.
  // The check below ensures that BrowserPlugin:Attach does not get called with
  // a different instance ID after step 1 has happened.
  // TODO(fsamuel): We may wish to support reattaching guests in the future:
  // http://crbug.com/156219.
  if (browser_plugin->HasNavigated())
    return false;

  browser_plugin->OnInstanceIDAllocated(window_id);
  return true;
}

bool BrowserPlugin::HasNavigated() const {
  return !before_first_navigation_;
}

bool BrowserPlugin::HasGuestInstanceID() const {
  return guest_instance_id_ != browser_plugin::kInstanceIDNone;
}

bool BrowserPlugin::ParsePartitionAttribute(std::string* error_message) {
  if (HasNavigated()) {
    *error_message = browser_plugin::kErrorAlreadyNavigated;
    return false;
  }

  std::string input = GetPartitionAttribute();

  // Since the "persist:" prefix is in ASCII, StartsWith will work fine on
  // UTF-8 encoded |partition_id|. If the prefix is a match, we can safely
  // remove the prefix without splicing in the middle of a multi-byte codepoint.
  // We can use the rest of the string as UTF-8 encoded one.
  if (StartsWithASCII(input, browser_plugin::kPersistPrefix, true)) {
    size_t index = input.find(":");
    CHECK(index != std::string::npos);
    // It is safe to do index + 1, since we tested for the full prefix above.
    input = input.substr(index + 1);
    if (input.empty()) {
      valid_partition_id_ = false;
      *error_message = browser_plugin::kErrorInvalidPartition;
      return false;
    }
    persist_storage_ = true;
  } else {
    persist_storage_ = false;
  }

  valid_partition_id_ = true;
  storage_partition_id_ = input;
  return true;
}

bool BrowserPlugin::CanRemovePartitionAttribute(std::string* error_message) {
  if (HasGuestInstanceID())
    *error_message = browser_plugin::kErrorCannotRemovePartition;
  return !HasGuestInstanceID();
}

void BrowserPlugin::ShowSadGraphic() {
  // We won't paint the contents of the current backing store again so we might
  // as well toss it out and save memory.
  backing_store_.reset();
  // If the BrowserPlugin is scheduled to be deleted, then container_ will be
  // NULL so we shouldn't attempt to access it.
  if (container_)
    container_->invalidate();
}

void BrowserPlugin::ParseAttributes() {
  // TODO(mthiesse): Handle errors here?
  std::string error;
  ParsePartitionAttribute(&error);

  // Parse the 'src' attribute last, as it will set the has_navigated_ flag to
  // true, which prevents changing the 'partition' attribute.
  ParseSrcAttribute(&error);
}

float BrowserPlugin::GetDeviceScaleFactor() const {
  if (!render_view_.get())
    return 1.0f;
  return render_view_->GetWebView()->deviceScaleFactor();
}

void BrowserPlugin::UpdateDeviceScaleFactor(float device_scale_factor) {
  if (last_device_scale_factor_ == device_scale_factor || !paint_ack_received_)
    return;

  BrowserPluginHostMsg_ResizeGuest_Params params;
  PopulateResizeGuestParameters(&params, plugin_rect(), false);
  browser_plugin_manager()->Send(new BrowserPluginHostMsg_ResizeGuest(
      render_view_routing_id_,
      guest_instance_id_,
      params));
}

void BrowserPlugin::TriggerEvent(const std::string& event_name,
                                 std::map<std::string, base::Value*>* props) {
  if (!container())
    return;

  blink::WebFrame* frame = container()->element().document().frame();
  if (!frame)
    return;

  v8::HandleScope handle_scope(v8::Isolate::GetCurrent());
  v8::Local<v8::Context> context = frame->mainWorldScriptContext();
  v8::Context::Scope context_scope(context);

  std::string json_string;
  if (props) {
    base::DictionaryValue dict;
    for (std::map<std::string, base::Value*>::iterator iter = props->begin(),
             end = props->end(); iter != end; ++iter) {
      dict.Set(iter->first, iter->second);
    }

    JSONStringValueSerializer serializer(&json_string);
    if (!serializer.Serialize(dict))
      return;
  }

  blink::WebDOMEvent dom_event = frame->document().createEvent("CustomEvent");
  blink::WebDOMCustomEvent event = dom_event.to<blink::WebDOMCustomEvent>();

  // The events triggered directly from the plugin <object> are internal events
  // whose implementation details can (and likely will) change over time. The
  // wrapper/shim (e.g. <webview> tag) should receive these events, and expose a
  // more appropriate (and stable) event to the consumers as part of the API.
  event.initCustomEvent(
      blink::WebString::fromUTF8(GetInternalEventName(event_name.c_str())),
      false,
      false,
      blink::WebSerializedScriptValue::serialize(
          v8::String::NewFromUtf8(context->GetIsolate(),
                                  json_string.c_str(),
                                  v8::String::kNormalString,
                                  json_string.size())));
  container()->element().dispatchEvent(event);
}

void BrowserPlugin::UpdateGuestFocusState() {
  if (!HasGuestInstanceID())
    return;
  bool should_be_focused = ShouldGuestBeFocused();
  browser_plugin_manager()->Send(new BrowserPluginHostMsg_SetFocus(
      render_view_routing_id_,
      guest_instance_id_,
      should_be_focused));
}

bool BrowserPlugin::ShouldGuestBeFocused() const {
  bool embedder_focused = false;
  if (render_view_.get())
    embedder_focused = render_view_->has_focus();
  return plugin_focused_ && embedder_focused;
}

blink::WebPluginContainer* BrowserPlugin::container() const {
  return container_;
}

bool BrowserPlugin::initialize(WebPluginContainer* container) {
  if (!container)
    return false;

  if (!GetContentClient()->renderer()->AllowBrowserPlugin(container))
    return false;

  // Tell |container| to allow this plugin to use script objects.
  npp_.reset(new NPP_t);
  container->allowScriptObjects();

  bindings_.reset(new BrowserPluginBindings(this));
  container_ = container;
  container_->setWantsWheelEvents(true);
  ParseAttributes();
  g_plugin_container_map.Get().insert(std::make_pair(container_, this));
  return true;
}

void BrowserPlugin::EnableCompositing(bool enable) {
  if (compositing_enabled_ == enable)
    return;

  compositing_enabled_ = enable;
  if (enable) {
    // No need to keep the backing store and damage buffer around if we're now
    // compositing.
    backing_store_.reset();
    current_damage_buffer_.reset();
    if (!compositing_helper_.get()) {
      compositing_helper_ =
          ChildFrameCompositingHelper::CreateCompositingHelperForBrowserPlugin(
              weak_ptr_factory_.GetWeakPtr());
    }
  } else {
    if (paint_ack_received_) {
      // We're switching back to the software path. We create a new damage
      // buffer that can accommodate the current size of the container.
      BrowserPluginHostMsg_ResizeGuest_Params params;
      // Request a full repaint from the guest even if its size is not actually
      // changing.
      PopulateResizeGuestParameters(&params,
                                    plugin_rect(),
                                    true /* needs_repaint */);
      paint_ack_received_ = false;
      browser_plugin_manager()->Send(new BrowserPluginHostMsg_ResizeGuest(
          render_view_routing_id_,
          guest_instance_id_,
          params));
    }
  }
  compositing_helper_->EnableCompositing(enable);
  compositing_helper_->SetContentsOpaque(!GetAllowTransparencyAttribute());
}

void BrowserPlugin::destroy() {
  // If the plugin was initialized then it has a valid |npp_| identifier, and
  // the |container_| must clear references to the plugin's script objects.
  DCHECK(!npp_ || container_);
  if (container_)
    container_->clearScriptObjects();

  // The BrowserPlugin's WebPluginContainer is deleted immediately after this
  // call returns, so let's not keep a reference to it around.
  g_plugin_container_map.Get().erase(container_);
  if (compositing_helper_.get())
    compositing_helper_->OnContainerDestroy();
  container_ = NULL;
  // Will be a no-op if the mouse is not currently locked.
  if (render_view_.get())
    render_view_->mouse_lock_dispatcher()->OnLockTargetDestroyed(this);
  base::MessageLoop::current()->DeleteSoon(FROM_HERE, this);
}

NPObject* BrowserPlugin::scriptableObject() {
  if (!bindings_)
    return NULL;

  NPObject* browser_plugin_np_object(bindings_->np_object());
  // The object is expected to be retained before it is returned.
  blink::WebBindings::retainObject(browser_plugin_np_object);
  return browser_plugin_np_object;
}

NPP BrowserPlugin::pluginNPP() {
  return npp_.get();
}

bool BrowserPlugin::supportsKeyboardFocus() const {
  return true;
}

bool BrowserPlugin::supportsEditCommands() const {
  return true;
}

bool BrowserPlugin::supportsInputMethod() const {
  return true;
}

bool BrowserPlugin::canProcessDrag() const {
  return true;
}

void BrowserPlugin::paint(WebCanvas* canvas, const WebRect& rect) {
  if (guest_crashed_) {
    if (!sad_guest_)  // Lazily initialize bitmap.
      sad_guest_ = content::GetContentClient()->renderer()->
          GetSadWebViewBitmap();
    // content_shell does not have the sad plugin bitmap, so we'll paint black
    // instead to make it clear that something went wrong.
    if (sad_guest_) {
      PaintSadPlugin(canvas, plugin_rect_, *sad_guest_);
      return;
    }
  }
  SkAutoCanvasRestore auto_restore(canvas, true);
  canvas->translate(plugin_rect_.x(), plugin_rect_.y());
  SkRect image_data_rect = SkRect::MakeXYWH(
      SkIntToScalar(0),
      SkIntToScalar(0),
      SkIntToScalar(plugin_rect_.width()),
      SkIntToScalar(plugin_rect_.height()));
  canvas->clipRect(image_data_rect);
  // Paint black or white in case we have nothing in our backing store or we
  // need to show a gutter.
  SkPaint paint;
  paint.setStyle(SkPaint::kFill_Style);
  paint.setColor(guest_crashed_ ? SK_ColorBLACK : SK_ColorWHITE);
  canvas->drawRect(image_data_rect, paint);
  // Stay a solid color if we have never set a non-empty src, or we don't have a
  // backing store.
  if (!backing_store_.get() || !HasGuestInstanceID())
    return;
  float inverse_scale_factor =  1.0f / backing_store_->GetScaleFactor();
  canvas->scale(inverse_scale_factor, inverse_scale_factor);
  canvas->drawBitmap(backing_store_->GetBitmap(), 0, 0);
}

// static
bool BrowserPlugin::ShouldForwardToBrowserPlugin(
    const IPC::Message& message) {
  switch (message.type()) {
    case BrowserPluginMsg_AdvanceFocus::ID:
    case BrowserPluginMsg_Attach_ACK::ID:
    case BrowserPluginMsg_BuffersSwapped::ID:
    case BrowserPluginMsg_CompositorFrameSwapped::ID:
    case BrowserPluginMsg_CopyFromCompositingSurface::ID:
    case BrowserPluginMsg_GuestContentWindowReady::ID:
    case BrowserPluginMsg_GuestGone::ID:
    case BrowserPluginMsg_SetCursor::ID:
    case BrowserPluginMsg_SetMouseLock::ID:
    case BrowserPluginMsg_ShouldAcceptTouchEvents::ID:
    case BrowserPluginMsg_UpdatedName::ID:
    case BrowserPluginMsg_UpdateRect::ID:
      return true;
    default:
      break;
  }
  return false;
}

void BrowserPlugin::updateGeometry(
    const WebRect& window_rect,
    const WebRect& clip_rect,
    const WebVector<WebRect>& cut_outs_rects,
    bool is_visible) {
  int old_width = width();
  int old_height = height();
  plugin_rect_ = window_rect;
  if (!attached())
    return;

  // In AutoSize mode, guests don't care when the BrowserPlugin container is
  // resized. If |!paint_ack_received_|, then we are still waiting on a
  // previous resize to be ACK'ed and so we don't issue additional resizes
  // until the previous one is ACK'ed.
  // TODO(mthiesse): Assess the performance of calling GetAutoSizeAttribute() on
  // resize.
  if (!paint_ack_received_ ||
      (old_width == window_rect.width && old_height == window_rect.height) ||
      GetAutoSizeAttribute()) {
    // Let the browser know about the updated view rect.
    browser_plugin_manager()->Send(new BrowserPluginHostMsg_UpdateGeometry(
        render_view_routing_id_, guest_instance_id_, plugin_rect_));
    return;
  }

  BrowserPluginHostMsg_ResizeGuest_Params params;
  PopulateResizeGuestParameters(&params, plugin_rect(), false);
  paint_ack_received_ = false;
  browser_plugin_manager()->Send(new BrowserPluginHostMsg_ResizeGuest(
      render_view_routing_id_,
      guest_instance_id_,
      params));
}

void BrowserPlugin::SwapDamageBuffers() {
  current_damage_buffer_.reset(pending_damage_buffer_.release());
  paint_ack_received_ = true;
}

void BrowserPlugin::PopulateResizeGuestParameters(
    BrowserPluginHostMsg_ResizeGuest_Params* params,
    const gfx::Rect& view_rect,
    bool needs_repaint) {
  params->size_changed = true;
  params->view_rect = view_rect;
  params->repaint = needs_repaint;
  params->scale_factor = GetDeviceScaleFactor();
  if (last_device_scale_factor_ != params->scale_factor){
    params->repaint = true;
    last_device_scale_factor_ = params->scale_factor;
  }

  // In HW compositing mode, we do not need a damage buffer.
  if (compositing_enabled_)
    return;

  const size_t stride = skia::PlatformCanvasStrideForWidth(view_rect.width());
  // Make sure the size of the damage buffer is at least four bytes so that we
  // can fit in a magic word to verify that the memory is shared correctly.
  size_t size =
      std::max(sizeof(unsigned int),
               static_cast<size_t>(view_rect.height() *
                                   stride *
                                   GetDeviceScaleFactor() *
                                   GetDeviceScaleFactor()));

  params->damage_buffer_size = size;
  pending_damage_buffer_.reset(
      CreateDamageBuffer(size, &params->damage_buffer_handle));
  if (!pending_damage_buffer_)
    NOTREACHED();
  params->damage_buffer_sequence_id = ++damage_buffer_sequence_id_;
}

void BrowserPlugin::GetDamageBufferWithSizeParams(
    BrowserPluginHostMsg_AutoSize_Params* auto_size_params,
    BrowserPluginHostMsg_ResizeGuest_Params* resize_guest_params,
    bool needs_repaint) {
  if (auto_size_params) {
    PopulateAutoSizeParameters(auto_size_params, GetAutoSizeAttribute());
  } else {
    max_auto_size_ = gfx::Size();
  }
  gfx::Size view_size = (auto_size_params && auto_size_params->enable) ?
      auto_size_params->max_size : gfx::Size(width(), height());
  if (view_size.IsEmpty())
    return;
  paint_ack_received_ = false;
  gfx::Rect view_rect = gfx::Rect(plugin_rect_.origin(), view_size);
  PopulateResizeGuestParameters(resize_guest_params, view_rect, needs_repaint);
}

#if defined(OS_POSIX)
base::SharedMemory* BrowserPlugin::CreateDamageBuffer(
    const size_t size,
    base::SharedMemoryHandle* damage_buffer_handle) {
  scoped_ptr<base::SharedMemory> shared_buf(
      content::RenderThread::Get()->HostAllocateSharedMemoryBuffer(
          size).release());

  if (shared_buf) {
    if (shared_buf->Map(size)) {
      // Insert the magic word.
      *static_cast<unsigned int*>(shared_buf->memory()) = 0xdeadbeef;
      shared_buf->ShareToProcess(base::GetCurrentProcessHandle(),
                                 damage_buffer_handle);
      return shared_buf.release();
    }
  }
  NOTREACHED();
  return NULL;
}
#elif defined(OS_WIN)
base::SharedMemory* BrowserPlugin::CreateDamageBuffer(
    const size_t size,
    base::SharedMemoryHandle* damage_buffer_handle) {
  scoped_ptr<base::SharedMemory> shared_buf(new base::SharedMemory());

  if (!shared_buf->CreateAndMapAnonymous(size)) {
    NOTREACHED() << "Buffer allocation failed";
    return NULL;
  }

  // Insert the magic word.
  *static_cast<unsigned int*>(shared_buf->memory()) = 0xdeadbeef;
  if (shared_buf->ShareToProcess(base::GetCurrentProcessHandle(),
                                 damage_buffer_handle))
    return shared_buf.release();
  NOTREACHED();
  return NULL;
}
#endif

void BrowserPlugin::updateFocus(bool focused) {
  plugin_focused_ = focused;
  UpdateGuestFocusState();
}

void BrowserPlugin::updateVisibility(bool visible) {
  if (visible_ == visible)
    return;

  visible_ = visible;
  if (!HasGuestInstanceID())
    return;

  if (compositing_helper_.get())
    compositing_helper_->UpdateVisibility(visible);

  browser_plugin_manager()->Send(new BrowserPluginHostMsg_SetVisibility(
      render_view_routing_id_,
      guest_instance_id_,
      visible));
}

bool BrowserPlugin::acceptsInputEvents() {
  return true;
}

bool BrowserPlugin::handleInputEvent(const blink::WebInputEvent& event,
                                     blink::WebCursorInfo& cursor_info) {
  if (guest_crashed_ || !HasGuestInstanceID())
    return false;

  if (event.type == blink::WebInputEvent::ContextMenu)
    return true;

  const blink::WebInputEvent* modified_event = &event;
  scoped_ptr<blink::WebTouchEvent> touch_event;
  // WebKit gives BrowserPlugin a list of touches that are down, but the browser
  // process expects a list of all touches. We modify the TouchEnd event here to
  // match these expectations.
  if (event.type == blink::WebInputEvent::TouchEnd) {
    const blink::WebTouchEvent* orig_touch_event =
        static_cast<const blink::WebTouchEvent*>(&event);
    touch_event.reset(new blink::WebTouchEvent());
    memcpy(touch_event.get(), orig_touch_event, sizeof(blink::WebTouchEvent));
    if (touch_event->changedTouchesLength > 0) {
      memcpy(&touch_event->touches[touch_event->touchesLength],
             &touch_event->changedTouches,
            touch_event->changedTouchesLength * sizeof(blink::WebTouchPoint));
    }
    touch_event->touchesLength += touch_event->changedTouchesLength;
    modified_event = touch_event.get();
  }

  if (blink::WebInputEvent::isKeyboardEventType(event.type) &&
      !edit_commands_.empty()) {
    browser_plugin_manager()->Send(
        new BrowserPluginHostMsg_SetEditCommandsForNextKeyEvent(
            render_view_routing_id_,
            guest_instance_id_,
            edit_commands_));
    edit_commands_.clear();
  }

  browser_plugin_manager()->Send(
      new BrowserPluginHostMsg_HandleInputEvent(render_view_routing_id_,
                                                guest_instance_id_,
                                                plugin_rect_,
                                                modified_event));
  GetWebKitCursorInfo(cursor_, &cursor_info);
  return true;
}

bool BrowserPlugin::handleDragStatusUpdate(blink::WebDragStatus drag_status,
                                           const blink::WebDragData& drag_data,
                                           blink::WebDragOperationsMask mask,
                                           const blink::WebPoint& position,
                                           const blink::WebPoint& screen) {
  if (guest_crashed_ || !HasGuestInstanceID())
    return false;
  browser_plugin_manager()->Send(
      new BrowserPluginHostMsg_DragStatusUpdate(
        render_view_routing_id_,
        guest_instance_id_,
        drag_status,
        DropDataBuilder::Build(drag_data),
        mask,
        position));
  return true;
}

void BrowserPlugin::didReceiveResponse(
    const blink::WebURLResponse& response) {
}

void BrowserPlugin::didReceiveData(const char* data, int data_length) {
}

void BrowserPlugin::didFinishLoading() {
}

void BrowserPlugin::didFailLoading(const blink::WebURLError& error) {
}

void BrowserPlugin::didFinishLoadingFrameRequest(const blink::WebURL& url,
                                                 void* notify_data) {
}

void BrowserPlugin::didFailLoadingFrameRequest(
    const blink::WebURL& url,
    void* notify_data,
    const blink::WebURLError& error) {
}

bool BrowserPlugin::executeEditCommand(const blink::WebString& name) {
  browser_plugin_manager()->Send(new BrowserPluginHostMsg_ExecuteEditCommand(
      render_view_routing_id_,
      guest_instance_id_,
      name.utf8()));

  // BrowserPlugin swallows edit commands.
  return true;
}

bool BrowserPlugin::executeEditCommand(const blink::WebString& name,
                                       const blink::WebString& value) {
  edit_commands_.push_back(EditCommand(name.utf8(), value.utf8()));
  // BrowserPlugin swallows edit commands.
  return true;
}

bool BrowserPlugin::setComposition(
    const blink::WebString& text,
    const blink::WebVector<blink::WebCompositionUnderline>& underlines,
    int selectionStart,
    int selectionEnd) {
  if (!HasGuestInstanceID())
    return false;
  std::vector<blink::WebCompositionUnderline> std_underlines;
  for (size_t i = 0; i < underlines.size(); ++i) {
    std_underlines.push_back(underlines[i]);
  }
  browser_plugin_manager()->Send(new BrowserPluginHostMsg_ImeSetComposition(
      render_view_routing_id_,
      guest_instance_id_,
      text.utf8(),
      std_underlines,
      selectionStart,
      selectionEnd));
  // TODO(kochi): This assumes the IPC handling always succeeds.
  return true;
}

bool BrowserPlugin::confirmComposition(
    const blink::WebString& text,
    blink::WebWidget::ConfirmCompositionBehavior selectionBehavior) {
  if (!HasGuestInstanceID())
    return false;
  bool keep_selection = (selectionBehavior == blink::WebWidget::KeepSelection);
  browser_plugin_manager()->Send(new BrowserPluginHostMsg_ImeConfirmComposition(
      render_view_routing_id_,
      guest_instance_id_,
      text.utf8(),
      keep_selection));
  // TODO(kochi): This assumes the IPC handling always succeeds.
  return true;
}

void BrowserPlugin::extendSelectionAndDelete(int before, int after) {
  if (!HasGuestInstanceID())
    return;
  browser_plugin_manager()->Send(
      new BrowserPluginHostMsg_ExtendSelectionAndDelete(
          render_view_routing_id_,
          guest_instance_id_,
          before,
          after));
}

void BrowserPlugin::OnLockMouseACK(bool succeeded) {
  mouse_locked_ = succeeded;
  browser_plugin_manager()->Send(new BrowserPluginHostMsg_LockMouse_ACK(
      render_view_routing_id_,
      guest_instance_id_,
      succeeded));
}

void BrowserPlugin::OnMouseLockLost() {
  mouse_locked_ = false;
  browser_plugin_manager()->Send(new BrowserPluginHostMsg_UnlockMouse_ACK(
      render_view_routing_id_,
      guest_instance_id_));
}

bool BrowserPlugin::HandleMouseLockedInputEvent(
    const blink::WebMouseEvent& event) {
  browser_plugin_manager()->Send(
      new BrowserPluginHostMsg_HandleInputEvent(render_view_routing_id_,
                                                guest_instance_id_,
                                                plugin_rect_,
                                                &event));
  return true;
}

}  // namespace content
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root/content/renderer/browser_plugin/browser_plugin.cc

DEFINITIONS
