content/renderer/renderer_webkitplatformsupport

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This source file includes following definitions.
FileUtilities
SandboxSupport
web_scrollbar_behavior_
clipboard
mimeRegistry
fileUtilities
sandboxSupport
cookieJar
themeEngine
sandboxEnabled
visitedLinkHash
isLinkVisited
createMessagePortChannel
prescientNetworking
CheckPreparsedJsCachingEnabled
cacheMetadata
defaultLocale
suddenTerminationChanged
createLocalStorageNamespace
idbFactory
fileSystem
supportsMediaMIMEType
supportsMediaSourceMIMEType
supportsEncryptedMediaMIMEType
mimeTypeForExtension
mimeTypeFromFile
getFileInfo
SendSyncMessageFromAnyThread
ensureFontLoaded
loadFont
getFontFamilyForCharacter
getRenderStyleForStrike
databaseOpenFile
databaseDeleteFile
databaseGetFileAttributes
databaseGetFileSize
databaseGetSpaceAvailableForOrigin
canAccelerate2dCanvas
isThreadedCompositingEnabled
audioHardwareSampleRate
audioHardwareBufferSize
audioHardwareOutputChannels
databaseObserver
createAudioDevice
loadAudioResource
loadAudioResource
createMIDIAccessor
getPluginList
publicSuffixList
signedPublicKeyAndChallengeString
screenColorProfile
scrollbarBehavior
blobRegistry
sampleGamepads
setGamepadListener
createRTCPeerConnectionHandler
createMediaStreamCenter
SetSandboxEnabledForTesting
SetMockGamepadsForTesting
MockGamepadConnected
MockGamepadDisconnected
createSpeechSynthesizer
processMemorySizesInBytes
createOffscreenGraphicsContext3D
createOffscreenGraphicsContext3D
createSharedOffscreenGraphicsContext3DProvider
compositorSupport
convertIDNToUnicode
setDeviceMotionListener
SetMockDeviceMotionDataForTesting
setDeviceOrientationListener
SetMockDeviceOrientationDataForTesting
vibrate
cancelVibration
setScreenOrientationListener
lockOrientation
unlockOrientation
SetMockScreenOrientationForTesting
queryStorageUsageAndQuota
// 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/renderer/renderer_webkitplatformsupport_impl.h"

#include "base/command_line.h"
#include "base/files/file_path.h"
#include "base/lazy_instance.h"
#include "base/memory/shared_memory.h"
#include "base/message_loop/message_loop_proxy.h"
#include "base/metrics/histogram.h"
#include "base/numerics/safe_conversions.h"
#include "base/platform_file.h"
#include "base/strings/string_number_conversions.h"
#include "base/strings/utf_string_conversions.h"
#include "content/child/blink_glue.h"
#include "content/child/database_util.h"
#include "content/child/fileapi/webfilesystem_impl.h"
#include "content/child/indexed_db/webidbfactory_impl.h"
#include "content/child/npapi/npobject_util.h"
#include "content/child/quota_dispatcher.h"
#include "content/child/quota_message_filter.h"
#include "content/child/simple_webmimeregistry_impl.h"
#include "content/child/thread_safe_sender.h"
#include "content/child/web_database_observer_impl.h"
#include "content/child/webblobregistry_impl.h"
#include "content/child/webfileutilities_impl.h"
#include "content/child/webmessageportchannel_impl.h"
#include "content/common/file_utilities_messages.h"
#include "content/common/gpu/client/context_provider_command_buffer.h"
#include "content/common/gpu/client/gpu_channel_host.h"
#include "content/common/gpu/client/webgraphicscontext3d_command_buffer_impl.h"
#include "content/common/gpu/gpu_process_launch_causes.h"
#include "content/common/mime_registry_messages.h"
#include "content/common/screen_orientation_messages.h"
#include "content/common/view_messages.h"
#include "content/public/common/content_switches.h"
#include "content/public/common/webplugininfo.h"
#include "content/public/renderer/content_renderer_client.h"
#include "content/renderer/device_orientation/device_motion_event_pump.h"
#include "content/renderer/device_orientation/device_orientation_event_pump.h"
#include "content/renderer/dom_storage/webstoragenamespace_impl.h"
#include "content/renderer/gamepad_shared_memory_reader.h"
#include "content/renderer/media/audio_decoder.h"
#include "content/renderer/media/crypto/key_systems.h"
#include "content/renderer/media/media_stream_dependency_factory.h"
#include "content/renderer/media/renderer_webaudiodevice_impl.h"
#include "content/renderer/media/renderer_webmidiaccessor_impl.h"
#include "content/renderer/media/webcontentdecryptionmodule_impl.h"
#include "content/renderer/render_thread_impl.h"
#include "content/renderer/renderer_clipboard_client.h"
#include "content/renderer/screen_orientation/screen_orientation_dispatcher.h"
#include "content/renderer/webclipboard_impl.h"
#include "content/renderer/webgraphicscontext3d_provider_impl.h"
#include "content/renderer/webpublicsuffixlist_impl.h"
#include "gpu/config/gpu_info.h"
#include "ipc/ipc_sync_message_filter.h"
#include "media/audio/audio_output_device.h"
#include "media/base/audio_hardware_config.h"
#include "media/filters/stream_parser_factory.h"
#include "net/base/mime_util.h"
#include "net/base/net_util.h"
#include "third_party/WebKit/public/platform/WebBlobRegistry.h"
#include "third_party/WebKit/public/platform/WebDeviceMotionListener.h"
#include "third_party/WebKit/public/platform/WebDeviceOrientationListener.h"
#include "third_party/WebKit/public/platform/WebFileInfo.h"
#include "third_party/WebKit/public/platform/WebGamepads.h"
#include "third_party/WebKit/public/platform/WebMediaStreamCenter.h"
#include "third_party/WebKit/public/platform/WebMediaStreamCenterClient.h"
#include "third_party/WebKit/public/platform/WebPluginListBuilder.h"
#include "third_party/WebKit/public/platform/WebScreenOrientationListener.h"
#include "third_party/WebKit/public/platform/WebURL.h"
#include "third_party/WebKit/public/platform/WebVector.h"
#include "ui/gfx/color_profile.h"
#include "url/gurl.h"
#include "webkit/common/gpu/context_provider_web_context.h"
#include "webkit/common/quota/quota_types.h"

#if defined(OS_ANDROID)
#include "content/renderer/media/android/audio_decoder_android.h"
#endif

#if defined(OS_MACOSX)
#include "content/common/mac/font_descriptor.h"
#include "content/common/mac/font_loader.h"
#include "content/renderer/webscrollbarbehavior_impl_mac.h"
#include "third_party/WebKit/public/platform/mac/WebSandboxSupport.h"
#endif

#if defined(OS_POSIX)
#include "base/file_descriptor_posix.h"
#if !defined(OS_MACOSX) && !defined(OS_ANDROID)
#include <map>
#include <string>

#include "base/synchronization/lock.h"
#include "content/common/child_process_sandbox_support_impl_linux.h"
#include "third_party/WebKit/public/platform/linux/WebFontFamily.h"
#include "third_party/WebKit/public/platform/linux/WebSandboxSupport.h"
#include "third_party/icu/source/common/unicode/utf16.h"
#endif
#endif

#if defined(OS_WIN)
#include "content/common/child_process_messages.h"
#include "third_party/WebKit/public/platform/win/WebSandboxSupport.h"
#endif

#if defined(TOOLKIT_GTK) || defined(USE_AURA)
#include "content/renderer/webscrollbarbehavior_impl_gtkoraura.h"
#elif !defined(OS_MACOSX)
#include "third_party/WebKit/public/platform/WebScrollbarBehavior.h"
#define WebScrollbarBehaviorImpl blink::WebScrollbarBehavior
#endif

using blink::Platform;
using blink::WebAudioDevice;
using blink::WebBlobRegistry;
using blink::WebDatabaseObserver;
using blink::WebFileInfo;
using blink::WebFileSystem;
using blink::WebGamepad;
using blink::WebGamepads;
using blink::WebIDBFactory;
using blink::WebMIDIAccessor;
using blink::WebMediaStreamCenter;
using blink::WebMediaStreamCenterClient;
using blink::WebMimeRegistry;
using blink::WebRTCPeerConnectionHandler;
using blink::WebRTCPeerConnectionHandlerClient;
using blink::WebStorageNamespace;
using blink::WebString;
using blink::WebURL;
using blink::WebVector;

namespace content {

static bool g_sandbox_enabled = true;
static blink::WebGamepadListener* web_gamepad_listener = NULL;
base::LazyInstance<WebGamepads>::Leaky g_test_gamepads =
    LAZY_INSTANCE_INITIALIZER;
base::LazyInstance<blink::WebDeviceMotionData>::Leaky
    g_test_device_motion_data = LAZY_INSTANCE_INITIALIZER;
base::LazyInstance<blink::WebDeviceOrientationData>::Leaky
    g_test_device_orientation_data = LAZY_INSTANCE_INITIALIZER;
base::LazyInstance<blink::WebScreenOrientation>::Leaky
    g_test_screen_orientation_value = LAZY_INSTANCE_INITIALIZER;

//------------------------------------------------------------------------------

class RendererWebKitPlatformSupportImpl::MimeRegistry
    : public SimpleWebMimeRegistryImpl {
 public:
  virtual blink::WebMimeRegistry::SupportsType supportsMediaMIMEType(
      const blink::WebString& mime_type,
      const blink::WebString& codecs,
      const blink::WebString& key_system);
  virtual bool supportsMediaSourceMIMEType(const blink::WebString& mime_type,
                                           const blink::WebString& codecs);
  virtual bool supportsEncryptedMediaMIMEType(const WebString& key_system,
                                              const WebString& mime_type,
                                              const WebString& codecs) OVERRIDE;
  virtual blink::WebString mimeTypeForExtension(
      const blink::WebString& file_extension);
  virtual blink::WebString mimeTypeFromFile(
      const blink::WebString& file_path);
};

class RendererWebKitPlatformSupportImpl::FileUtilities
    : public WebFileUtilitiesImpl {
 public:
  explicit FileUtilities(ThreadSafeSender* sender)
      : thread_safe_sender_(sender) {}
  virtual bool getFileInfo(const WebString& path, WebFileInfo& result);
 private:
  bool SendSyncMessageFromAnyThread(IPC::SyncMessage* msg) const;
  scoped_refptr<ThreadSafeSender> thread_safe_sender_;
};

#if defined(OS_ANDROID)
// WebKit doesn't use WebSandboxSupport on android so we don't need to
// implement anything here.
class RendererWebKitPlatformSupportImpl::SandboxSupport {
};
#else
class RendererWebKitPlatformSupportImpl::SandboxSupport
    : public blink::WebSandboxSupport {
 public:
  virtual ~SandboxSupport() {}

#if defined(OS_WIN)
  virtual bool ensureFontLoaded(HFONT);
#elif defined(OS_MACOSX)
  virtual bool loadFont(
      NSFont* src_font,
      CGFontRef* container,
      uint32* font_id);
#elif defined(OS_POSIX)
  virtual void getFontFamilyForCharacter(
      blink::WebUChar32 character,
      const char* preferred_locale,
      blink::WebFontFamily* family);
  virtual void getRenderStyleForStrike(
      const char* family, int sizeAndStyle, blink::WebFontRenderStyle* out);

 private:
  // WebKit likes to ask us for the correct font family to use for a set of
  // unicode code points. It needs this information frequently so we cache it
  // here.
  base::Lock unicode_font_families_mutex_;
  std::map<int32_t, blink::WebFontFamily> unicode_font_families_;
#endif
};
#endif  // defined(OS_ANDROID)

//------------------------------------------------------------------------------

RendererWebKitPlatformSupportImpl::RendererWebKitPlatformSupportImpl()
    : clipboard_client_(new RendererClipboardClient),
      clipboard_(new WebClipboardImpl(clipboard_client_.get())),
      mime_registry_(new RendererWebKitPlatformSupportImpl::MimeRegistry),
      sudden_termination_disables_(0),
      plugin_refresh_allowed_(true),
      child_thread_loop_(base::MessageLoopProxy::current()),
      web_scrollbar_behavior_(new WebScrollbarBehaviorImpl) {
  if (g_sandbox_enabled && sandboxEnabled()) {
    sandbox_support_.reset(
        new RendererWebKitPlatformSupportImpl::SandboxSupport);
  } else {
    DVLOG(1) << "Disabling sandbox support for testing.";
  }

  // ChildThread may not exist in some tests.
  if (ChildThread::current()) {
    sync_message_filter_ = ChildThread::current()->sync_message_filter();
    thread_safe_sender_ = ChildThread::current()->thread_safe_sender();
    quota_message_filter_ = ChildThread::current()->quota_message_filter();
    blob_registry_.reset(new WebBlobRegistryImpl(thread_safe_sender_));
    web_idb_factory_.reset(new WebIDBFactoryImpl(thread_safe_sender_));
    web_database_observer_impl_.reset(
        new WebDatabaseObserverImpl(sync_message_filter_));
  }
}

RendererWebKitPlatformSupportImpl::~RendererWebKitPlatformSupportImpl() {
  WebFileSystemImpl::DeleteThreadSpecificInstance();
}

//------------------------------------------------------------------------------

blink::WebClipboard* RendererWebKitPlatformSupportImpl::clipboard() {
  blink::WebClipboard* clipboard =
      GetContentClient()->renderer()->OverrideWebClipboard();
  if (clipboard)
    return clipboard;
  return clipboard_.get();
}

blink::WebMimeRegistry* RendererWebKitPlatformSupportImpl::mimeRegistry() {
  return mime_registry_.get();
}

blink::WebFileUtilities*
RendererWebKitPlatformSupportImpl::fileUtilities() {
  if (!file_utilities_) {
    file_utilities_.reset(new FileUtilities(thread_safe_sender_.get()));
    file_utilities_->set_sandbox_enabled(sandboxEnabled());
  }
  return file_utilities_.get();
}

blink::WebSandboxSupport* RendererWebKitPlatformSupportImpl::sandboxSupport() {
#if defined(OS_ANDROID)
  // WebKit doesn't use WebSandboxSupport on android.
  return NULL;
#else
  return sandbox_support_.get();
#endif
}

blink::WebCookieJar* RendererWebKitPlatformSupportImpl::cookieJar() {
  NOTREACHED() << "Use WebFrameClient::cookieJar() instead!";
  return NULL;
}

blink::WebThemeEngine* RendererWebKitPlatformSupportImpl::themeEngine() {
  blink::WebThemeEngine* theme_engine =
      GetContentClient()->renderer()->OverrideThemeEngine();
  if (theme_engine)
    return theme_engine;
  return BlinkPlatformImpl::themeEngine();
}

bool RendererWebKitPlatformSupportImpl::sandboxEnabled() {
  // As explained in Platform.h, this function is used to decide
  // whether to allow file system operations to come out of WebKit or not.
  // Even if the sandbox is disabled, there's no reason why the code should
  // act any differently...unless we're in single process mode.  In which
  // case, we have no other choice.  Platform.h discourages using
  // this switch unless absolutely necessary, so hopefully we won't end up
  // with too many code paths being different in single-process mode.
  return !CommandLine::ForCurrentProcess()->HasSwitch(switches::kSingleProcess);
}

unsigned long long RendererWebKitPlatformSupportImpl::visitedLinkHash(
    const char* canonical_url,
    size_t length) {
  return GetContentClient()->renderer()->VisitedLinkHash(canonical_url, length);
}

bool RendererWebKitPlatformSupportImpl::isLinkVisited(
    unsigned long long link_hash) {
  return GetContentClient()->renderer()->IsLinkVisited(link_hash);
}

blink::WebMessagePortChannel*
RendererWebKitPlatformSupportImpl::createMessagePortChannel() {
  return new WebMessagePortChannelImpl(child_thread_loop_.get());
}

blink::WebPrescientNetworking*
RendererWebKitPlatformSupportImpl::prescientNetworking() {
  return GetContentClient()->renderer()->GetPrescientNetworking();
}

bool
RendererWebKitPlatformSupportImpl::CheckPreparsedJsCachingEnabled() const {
  static bool checked = false;
  static bool result = false;
  if (!checked) {
    const CommandLine& command_line = *CommandLine::ForCurrentProcess();
    result = command_line.HasSwitch(switches::kEnablePreparsedJsCaching);
    checked = true;
  }
  return result;
}

void RendererWebKitPlatformSupportImpl::cacheMetadata(
    const blink::WebURL& url,
    double response_time,
    const char* data,
    size_t size) {
  if (!CheckPreparsedJsCachingEnabled())
    return;

  // Let the browser know we generated cacheable metadata for this resource. The
  // browser may cache it and return it on subsequent responses to speed
  // the processing of this resource.
  std::vector<char> copy(data, data + size);
  RenderThread::Get()->Send(
      new ViewHostMsg_DidGenerateCacheableMetadata(url, response_time, copy));
}

WebString RendererWebKitPlatformSupportImpl::defaultLocale() {
  return base::ASCIIToUTF16(RenderThread::Get()->GetLocale());
}

void RendererWebKitPlatformSupportImpl::suddenTerminationChanged(bool enabled) {
  if (enabled) {
    // We should not get more enables than disables, but we want it to be a
    // non-fatal error if it does happen.
    DCHECK_GT(sudden_termination_disables_, 0);
    sudden_termination_disables_ = std::max(sudden_termination_disables_ - 1,
                                            0);
    if (sudden_termination_disables_ != 0)
      return;
  } else {
    sudden_termination_disables_++;
    if (sudden_termination_disables_ != 1)
      return;
  }

  RenderThread* thread = RenderThread::Get();
  if (thread)  // NULL in unittests.
    thread->Send(new ViewHostMsg_SuddenTerminationChanged(enabled));
}

WebStorageNamespace*
RendererWebKitPlatformSupportImpl::createLocalStorageNamespace() {
  return new WebStorageNamespaceImpl();
}


//------------------------------------------------------------------------------

WebIDBFactory* RendererWebKitPlatformSupportImpl::idbFactory() {
  return web_idb_factory_.get();
}

//------------------------------------------------------------------------------

WebFileSystem* RendererWebKitPlatformSupportImpl::fileSystem() {
  return WebFileSystemImpl::ThreadSpecificInstance(child_thread_loop_.get());
}

//------------------------------------------------------------------------------

WebMimeRegistry::SupportsType
RendererWebKitPlatformSupportImpl::MimeRegistry::supportsMediaMIMEType(
    const WebString& mime_type,
    const WebString& codecs,
    const WebString& key_system) {
  const std::string mime_type_ascii = ToASCIIOrEmpty(mime_type);
  // Not supporting the container is a flat-out no.
  if (!net::IsSupportedMediaMimeType(mime_type_ascii))
    return IsNotSupported;

  if (!key_system.isEmpty()) {
    // Check whether the key system is supported with the mime_type and codecs.

    // Chromium only supports ASCII parameters.
    if (!IsStringASCII(key_system))
      return IsNotSupported;

    std::string key_system_ascii =
        GetUnprefixedKeySystemName(base::UTF16ToASCII(key_system));
    std::vector<std::string> strict_codecs;
    bool strip_suffix = !net::IsStrictMediaMimeType(mime_type_ascii);
    net::ParseCodecString(ToASCIIOrEmpty(codecs), &strict_codecs, strip_suffix);

    if (!IsSupportedKeySystemWithMediaMimeType(
            mime_type_ascii, strict_codecs, key_system_ascii)) {
      return IsNotSupported;
    }

    // Continue processing the mime_type and codecs.
  }

  // Check list of strict codecs to see if it is supported.
  if (net::IsStrictMediaMimeType(mime_type_ascii)) {
    // We support the container, but no codecs were specified.
    if (codecs.isNull())
      return MayBeSupported;

    // Check if the codecs are a perfect match.
    std::vector<std::string> strict_codecs;
    net::ParseCodecString(ToASCIIOrEmpty(codecs), &strict_codecs, false);
    if (!net::IsSupportedStrictMediaMimeType(mime_type_ascii, strict_codecs))
      return IsNotSupported;

    // Good to go!
    return IsSupported;
  }

  // If we don't recognize the codec, it's possible we support it.
  std::vector<std::string> parsed_codecs;
  net::ParseCodecString(ToASCIIOrEmpty(codecs), &parsed_codecs, true);
  if (!net::AreSupportedMediaCodecs(parsed_codecs))
    return MayBeSupported;

  // Otherwise we have a perfect match.
  return IsSupported;
}

bool
RendererWebKitPlatformSupportImpl::MimeRegistry::supportsMediaSourceMIMEType(
    const blink::WebString& mime_type,
    const WebString& codecs) {
  const std::string mime_type_ascii = ToASCIIOrEmpty(mime_type);
  std::vector<std::string> parsed_codec_ids;
  net::ParseCodecString(ToASCIIOrEmpty(codecs), &parsed_codec_ids, false);
  if (mime_type_ascii.empty())
    return false;
  return media::StreamParserFactory::IsTypeSupported(
      mime_type_ascii, parsed_codec_ids);
}

bool
RendererWebKitPlatformSupportImpl::MimeRegistry::supportsEncryptedMediaMIMEType(
    const WebString& key_system,
    const WebString& mime_type,
    const WebString& codecs) {
  // Chromium only supports ASCII parameters.
  if (!IsStringASCII(key_system) || !IsStringASCII(mime_type) ||
      !IsStringASCII(codecs)) {
    return false;
  }

  if (key_system.isEmpty())
    return false;

  const std::string mime_type_ascii = base::UTF16ToASCII(mime_type);

  std::vector<std::string> codec_vector;
  bool strip_suffix = !net::IsStrictMediaMimeType(mime_type_ascii);
  net::ParseCodecString(base::UTF16ToASCII(codecs), &codec_vector,
                        strip_suffix);

  return IsSupportedKeySystemWithMediaMimeType(
      mime_type_ascii, codec_vector, base::UTF16ToASCII(key_system));
}

WebString
RendererWebKitPlatformSupportImpl::MimeRegistry::mimeTypeForExtension(
    const WebString& file_extension) {
  if (IsPluginProcess())
    return SimpleWebMimeRegistryImpl::mimeTypeForExtension(file_extension);

  // The sandbox restricts our access to the registry, so we need to proxy
  // these calls over to the browser process.
  std::string mime_type;
  RenderThread::Get()->Send(
      new MimeRegistryMsg_GetMimeTypeFromExtension(
          base::FilePath::FromUTF16Unsafe(file_extension).value(), &mime_type));
  return base::ASCIIToUTF16(mime_type);
}

WebString RendererWebKitPlatformSupportImpl::MimeRegistry::mimeTypeFromFile(
    const WebString& file_path) {
  if (IsPluginProcess())
    return SimpleWebMimeRegistryImpl::mimeTypeFromFile(file_path);

  // The sandbox restricts our access to the registry, so we need to proxy
  // these calls over to the browser process.
  std::string mime_type;
  RenderThread::Get()->Send(new MimeRegistryMsg_GetMimeTypeFromFile(
      base::FilePath::FromUTF16Unsafe(file_path),
      &mime_type));
  return base::ASCIIToUTF16(mime_type);
}

//------------------------------------------------------------------------------

bool RendererWebKitPlatformSupportImpl::FileUtilities::getFileInfo(
    const WebString& path,
    WebFileInfo& web_file_info) {
  base::File::Info file_info;
  base::File::Error status;
  if (!SendSyncMessageFromAnyThread(new FileUtilitiesMsg_GetFileInfo(
           base::FilePath::FromUTF16Unsafe(path), &file_info, &status)) ||
      status != base::File::FILE_OK) {
    return false;
  }
  FileInfoToWebFileInfo(file_info, &web_file_info);
  web_file_info.platformPath = path;
  return true;
}

bool RendererWebKitPlatformSupportImpl::FileUtilities::
SendSyncMessageFromAnyThread(IPC::SyncMessage* msg) const {
  base::TimeTicks begin = base::TimeTicks::Now();
  const bool success = thread_safe_sender_->Send(msg);
  base::TimeDelta delta = base::TimeTicks::Now() - begin;
  UMA_HISTOGRAM_TIMES("RendererSyncIPC.ElapsedTime", delta);
  return success;
}

//------------------------------------------------------------------------------

#if defined(OS_WIN)

bool RendererWebKitPlatformSupportImpl::SandboxSupport::ensureFontLoaded(
    HFONT font) {
  LOGFONT logfont;
  GetObject(font, sizeof(LOGFONT), &logfont);
  RenderThread::Get()->PreCacheFont(logfont);
  return true;
}

#elif defined(OS_MACOSX)

bool RendererWebKitPlatformSupportImpl::SandboxSupport::loadFont(
    NSFont* src_font, CGFontRef* out, uint32* font_id) {
  uint32 font_data_size;
  FontDescriptor src_font_descriptor(src_font);
  base::SharedMemoryHandle font_data;
  if (!RenderThread::Get()->Send(new ViewHostMsg_LoadFont(
        src_font_descriptor, &font_data_size, &font_data, font_id))) {
    *out = NULL;
    *font_id = 0;
    return false;
  }

  if (font_data_size == 0 || font_data == base::SharedMemory::NULLHandle() ||
      *font_id == 0) {
    LOG(ERROR) << "Bad response from ViewHostMsg_LoadFont() for " <<
        src_font_descriptor.font_name;
    *out = NULL;
    *font_id = 0;
    return false;
  }

  // TODO(jeremy): Need to call back into WebKit to make sure that the font
  // isn't already activated, based on the font id.  If it's already
  // activated, don't reactivate it here - crbug.com/72727 .

  return FontLoader::CGFontRefFromBuffer(font_data, font_data_size, out);
}

#elif defined(OS_ANDROID)

// WebKit doesn't use WebSandboxSupport on android so we don't need to
// implement anything here. This is cleaner to support than excluding the
// whole class for android.

#elif defined(OS_POSIX)

void
RendererWebKitPlatformSupportImpl::SandboxSupport::getFontFamilyForCharacter(
    blink::WebUChar32 character,
    const char* preferred_locale,
    blink::WebFontFamily* family) {
  base::AutoLock lock(unicode_font_families_mutex_);
  const std::map<int32_t, blink::WebFontFamily>::const_iterator iter =
      unicode_font_families_.find(character);
  if (iter != unicode_font_families_.end()) {
    family->name = iter->second.name;
    family->isBold = iter->second.isBold;
    family->isItalic = iter->second.isItalic;
    return;
  }

  GetFontFamilyForCharacter(character, preferred_locale, family);
  unicode_font_families_.insert(std::make_pair(character, *family));
}

void
RendererWebKitPlatformSupportImpl::SandboxSupport::getRenderStyleForStrike(
    const char* family, int sizeAndStyle, blink::WebFontRenderStyle* out) {
  GetRenderStyleForStrike(family, sizeAndStyle, out);
}

#endif

//------------------------------------------------------------------------------

Platform::FileHandle
RendererWebKitPlatformSupportImpl::databaseOpenFile(
    const WebString& vfs_file_name, int desired_flags) {
  return DatabaseUtil::DatabaseOpenFile(
      vfs_file_name, desired_flags, sync_message_filter_.get());
}

int RendererWebKitPlatformSupportImpl::databaseDeleteFile(
    const WebString& vfs_file_name, bool sync_dir) {
  return DatabaseUtil::DatabaseDeleteFile(
      vfs_file_name, sync_dir, sync_message_filter_.get());
}

long RendererWebKitPlatformSupportImpl::databaseGetFileAttributes(
    const WebString& vfs_file_name) {
  return DatabaseUtil::DatabaseGetFileAttributes(vfs_file_name,
                                                 sync_message_filter_.get());
}

long long RendererWebKitPlatformSupportImpl::databaseGetFileSize(
    const WebString& vfs_file_name) {
  return DatabaseUtil::DatabaseGetFileSize(vfs_file_name,
                                           sync_message_filter_.get());
}

long long RendererWebKitPlatformSupportImpl::databaseGetSpaceAvailableForOrigin(
    const WebString& origin_identifier) {
  return DatabaseUtil::DatabaseGetSpaceAvailable(origin_identifier,
                                                 sync_message_filter_.get());
}

bool RendererWebKitPlatformSupportImpl::canAccelerate2dCanvas() {
  RenderThreadImpl* thread = RenderThreadImpl::current();
  GpuChannelHost* host = thread->EstablishGpuChannelSync(
      CAUSE_FOR_GPU_LAUNCH_CANVAS_2D);
  if (!host)
    return false;

  return host->gpu_info().SupportsAccelerated2dCanvas();
}

bool RendererWebKitPlatformSupportImpl::isThreadedCompositingEnabled() {
  return !!RenderThreadImpl::current()->compositor_message_loop_proxy().get();
}

double RendererWebKitPlatformSupportImpl::audioHardwareSampleRate() {
  RenderThreadImpl* thread = RenderThreadImpl::current();
  return thread->GetAudioHardwareConfig()->GetOutputSampleRate();
}

size_t RendererWebKitPlatformSupportImpl::audioHardwareBufferSize() {
  RenderThreadImpl* thread = RenderThreadImpl::current();
  return thread->GetAudioHardwareConfig()->GetOutputBufferSize();
}

unsigned RendererWebKitPlatformSupportImpl::audioHardwareOutputChannels() {
  RenderThreadImpl* thread = RenderThreadImpl::current();
  return thread->GetAudioHardwareConfig()->GetOutputChannels();
}

WebDatabaseObserver* RendererWebKitPlatformSupportImpl::databaseObserver() {
  return web_database_observer_impl_.get();
}

WebAudioDevice*
RendererWebKitPlatformSupportImpl::createAudioDevice(
    size_t buffer_size,
    unsigned input_channels,
    unsigned channels,
    double sample_rate,
    WebAudioDevice::RenderCallback* callback,
    const blink::WebString& input_device_id) {
  // Use a mock for testing.
  blink::WebAudioDevice* mock_device =
      GetContentClient()->renderer()->OverrideCreateAudioDevice(sample_rate);
  if (mock_device)
    return mock_device;

  // The |channels| does not exactly identify the channel layout of the
  // device. The switch statement below assigns a best guess to the channel
  // layout based on number of channels.
  // TODO(crogers): WebKit should give the channel layout instead of the hard
  // channel count.
  media::ChannelLayout layout = media::CHANNEL_LAYOUT_UNSUPPORTED;
  switch (channels) {
    case 1:
      layout = media::CHANNEL_LAYOUT_MONO;
      break;
    case 2:
      layout = media::CHANNEL_LAYOUT_STEREO;
      break;
    case 3:
      layout = media::CHANNEL_LAYOUT_2_1;
      break;
    case 4:
      layout = media::CHANNEL_LAYOUT_4_0;
      break;
    case 5:
      layout = media::CHANNEL_LAYOUT_5_0;
      break;
    case 6:
      layout = media::CHANNEL_LAYOUT_5_1;
      break;
    case 7:
      layout = media::CHANNEL_LAYOUT_7_0;
      break;
    case 8:
      layout = media::CHANNEL_LAYOUT_7_1;
      break;
    default:
      layout = media::CHANNEL_LAYOUT_STEREO;
  }

  int session_id = 0;
  if (input_device_id.isNull() ||
      !base::StringToInt(base::UTF16ToUTF8(input_device_id), &session_id)) {
    if (input_channels > 0)
      DLOG(WARNING) << "createAudioDevice(): request for audio input ignored";

    input_channels = 0;
  }

  media::AudioParameters params(
      media::AudioParameters::AUDIO_PCM_LOW_LATENCY,
      layout, input_channels,
      static_cast<int>(sample_rate), 16, buffer_size,
      media::AudioParameters::NO_EFFECTS);

  return new RendererWebAudioDeviceImpl(params, callback, session_id);
}

#if defined(OS_ANDROID)
bool RendererWebKitPlatformSupportImpl::loadAudioResource(
    blink::WebAudioBus* destination_bus, const char* audio_file_data,
    size_t data_size) {
  return DecodeAudioFileData(destination_bus,
                             audio_file_data,
                             data_size,
                             thread_safe_sender_);
}
#else
bool RendererWebKitPlatformSupportImpl::loadAudioResource(
    blink::WebAudioBus* destination_bus, const char* audio_file_data,
    size_t data_size) {
  return DecodeAudioFileData(
      destination_bus, audio_file_data, data_size);
}
#endif  // defined(OS_ANDROID)

//------------------------------------------------------------------------------

blink::WebMIDIAccessor*
RendererWebKitPlatformSupportImpl::createMIDIAccessor(
    blink::WebMIDIAccessorClient* client) {
  blink::WebMIDIAccessor* accessor =
      GetContentClient()->renderer()->OverrideCreateMIDIAccessor(client);
  if (accessor)
    return accessor;

  return new RendererWebMIDIAccessorImpl(client);
}

void RendererWebKitPlatformSupportImpl::getPluginList(
    bool refresh,
    blink::WebPluginListBuilder* builder) {
#if defined(ENABLE_PLUGINS)
  std::vector<WebPluginInfo> plugins;
  if (!plugin_refresh_allowed_)
    refresh = false;
  RenderThread::Get()->Send(
      new ViewHostMsg_GetPlugins(refresh, &plugins));
  for (size_t i = 0; i < plugins.size(); ++i) {
    const WebPluginInfo& plugin = plugins[i];

    builder->addPlugin(
        plugin.name, plugin.desc,
        plugin.path.BaseName().AsUTF16Unsafe());

    for (size_t j = 0; j < plugin.mime_types.size(); ++j) {
      const WebPluginMimeType& mime_type = plugin.mime_types[j];

      builder->addMediaTypeToLastPlugin(
          WebString::fromUTF8(mime_type.mime_type), mime_type.description);

      for (size_t k = 0; k < mime_type.file_extensions.size(); ++k) {
        builder->addFileExtensionToLastMediaType(
            WebString::fromUTF8(mime_type.file_extensions[k]));
      }
    }
  }
#endif
}

//------------------------------------------------------------------------------

blink::WebPublicSuffixList*
RendererWebKitPlatformSupportImpl::publicSuffixList() {
  return &public_suffix_list_;
}

//------------------------------------------------------------------------------

blink::WebString
RendererWebKitPlatformSupportImpl::signedPublicKeyAndChallengeString(
    unsigned key_size_index,
    const blink::WebString& challenge,
    const blink::WebURL& url) {
  std::string signed_public_key;
  RenderThread::Get()->Send(new ViewHostMsg_Keygen(
      static_cast<uint32>(key_size_index),
      challenge.utf8(),
      GURL(url),
      &signed_public_key));
  return WebString::fromUTF8(signed_public_key);
}

//------------------------------------------------------------------------------

void RendererWebKitPlatformSupportImpl::screenColorProfile(
    WebVector<char>* to_profile) {
#if defined(OS_WIN)
  // On Windows screen color profile is only available in the browser.
  std::vector<char> profile;
  // This Send() can be called from any impl-side thread. Use a thread
  // safe send to avoid crashing trying to access RenderThread::Get(),
  // which is not accessible from arbitrary threads.
  thread_safe_sender_->Send(
      new ViewHostMsg_GetMonitorColorProfile(&profile));
  *to_profile = profile;
#else
  // On other platforms, the primary monitor color profile can be read
  // directly.
  gfx::ColorProfile profile;
  *to_profile = profile.profile();
#endif
}

//------------------------------------------------------------------------------

blink::WebScrollbarBehavior*
    RendererWebKitPlatformSupportImpl::scrollbarBehavior() {
  return web_scrollbar_behavior_.get();
}

//------------------------------------------------------------------------------

WebBlobRegistry* RendererWebKitPlatformSupportImpl::blobRegistry() {
  // blob_registry_ can be NULL when running some tests.
  return blob_registry_.get();
}

//------------------------------------------------------------------------------

void RendererWebKitPlatformSupportImpl::sampleGamepads(WebGamepads& gamepads) {
  if (g_test_gamepads == 0) {
    RenderThreadImpl::current()->SampleGamepads(&gamepads);
  } else {
    gamepads = g_test_gamepads.Get();
  }
}

void RendererWebKitPlatformSupportImpl::setGamepadListener(
      blink::WebGamepadListener* listener) {
  web_gamepad_listener = listener;
}

//------------------------------------------------------------------------------

WebRTCPeerConnectionHandler*
RendererWebKitPlatformSupportImpl::createRTCPeerConnectionHandler(
    WebRTCPeerConnectionHandlerClient* client) {
  RenderThreadImpl* render_thread = RenderThreadImpl::current();
  DCHECK(render_thread);
  if (!render_thread)
    return NULL;

#if defined(ENABLE_WEBRTC)
  WebRTCPeerConnectionHandler* peer_connection_handler =
      GetContentClient()->renderer()->OverrideCreateWebRTCPeerConnectionHandler(
          client);
  if (peer_connection_handler)
    return peer_connection_handler;

  MediaStreamDependencyFactory* rtc_dependency_factory =
      render_thread->GetMediaStreamDependencyFactory();
  return rtc_dependency_factory->CreateRTCPeerConnectionHandler(client);
#else
  return NULL;
#endif  // defined(ENABLE_WEBRTC)
}

//------------------------------------------------------------------------------

WebMediaStreamCenter*
RendererWebKitPlatformSupportImpl::createMediaStreamCenter(
    WebMediaStreamCenterClient* client) {
  RenderThreadImpl* render_thread = RenderThreadImpl::current();
  DCHECK(render_thread);
  if (!render_thread)
    return NULL;
  return render_thread->CreateMediaStreamCenter(client);
}

// static
bool RendererWebKitPlatformSupportImpl::SetSandboxEnabledForTesting(
    bool enable) {
  bool was_enabled = g_sandbox_enabled;
  g_sandbox_enabled = enable;
  return was_enabled;
}

// static
void RendererWebKitPlatformSupportImpl::SetMockGamepadsForTesting(
    const WebGamepads& pads) {
  g_test_gamepads.Get() = pads;
}

// static
void RendererWebKitPlatformSupportImpl::MockGamepadConnected(
    int index,
    const WebGamepad& pad) {
  if (web_gamepad_listener)
    web_gamepad_listener->didConnectGamepad(index, pad);
}

// static
void RendererWebKitPlatformSupportImpl::MockGamepadDisconnected(
    int index,
    const WebGamepad& pad) {
  if (web_gamepad_listener)
    web_gamepad_listener->didDisconnectGamepad(index, pad);
}

//------------------------------------------------------------------------------

blink::WebSpeechSynthesizer*
RendererWebKitPlatformSupportImpl::createSpeechSynthesizer(
    blink::WebSpeechSynthesizerClient* client) {
  return GetContentClient()->renderer()->OverrideSpeechSynthesizer(client);
}

//------------------------------------------------------------------------------

bool RendererWebKitPlatformSupportImpl::processMemorySizesInBytes(
    size_t* private_bytes, size_t* shared_bytes) {
  content::RenderThread::Get()->Send(
      new ViewHostMsg_GetProcessMemorySizes(private_bytes, shared_bytes));
  return true;
}

//------------------------------------------------------------------------------

blink::WebGraphicsContext3D*
RendererWebKitPlatformSupportImpl::createOffscreenGraphicsContext3D(
    const blink::WebGraphicsContext3D::Attributes& attributes) {
  return createOffscreenGraphicsContext3D(attributes, NULL);
}

blink::WebGraphicsContext3D*
RendererWebKitPlatformSupportImpl::createOffscreenGraphicsContext3D(
    const blink::WebGraphicsContext3D::Attributes& attributes,
    blink::WebGraphicsContext3D* share_context) {
  if (!RenderThreadImpl::current())
    return NULL;

  scoped_refptr<GpuChannelHost> gpu_channel_host(
      RenderThreadImpl::current()->EstablishGpuChannelSync(
          CAUSE_FOR_GPU_LAUNCH_WEBGRAPHICSCONTEXT3DCOMMANDBUFFERIMPL_INITIALIZE));

  WebGraphicsContext3DCommandBufferImpl::SharedMemoryLimits limits;

  CommandLine* command_line = CommandLine::ForCurrentProcess();
  if (command_line->HasSwitch(switches::kWebGLCommandBufferSizeKb)) {
    std::string size_string = command_line->GetSwitchValueASCII(
        switches::kWebGLCommandBufferSizeKb);
    size_t buffer_size_kb;
    if (base::StringToSizeT(size_string, &buffer_size_kb)) {
      limits.command_buffer_size = buffer_size_kb * 1024;
    }
  }
  bool lose_context_when_out_of_memory = false;
  return WebGraphicsContext3DCommandBufferImpl::CreateOffscreenContext(
      gpu_channel_host.get(),
      attributes,
      lose_context_when_out_of_memory,
      GURL(attributes.topDocumentURL),
      limits,
      static_cast<WebGraphicsContext3DCommandBufferImpl*>(share_context));
}

//------------------------------------------------------------------------------

blink::WebGraphicsContext3DProvider* RendererWebKitPlatformSupportImpl::
    createSharedOffscreenGraphicsContext3DProvider() {
  scoped_refptr<webkit::gpu::ContextProviderWebContext> provider =
      RenderThreadImpl::current()->SharedMainThreadContextProvider();
  if (!provider)
    return NULL;
  return new WebGraphicsContext3DProviderImpl(provider);
}

//------------------------------------------------------------------------------

blink::WebCompositorSupport*
RendererWebKitPlatformSupportImpl::compositorSupport() {
  return &compositor_support_;
}

//------------------------------------------------------------------------------

blink::WebString RendererWebKitPlatformSupportImpl::convertIDNToUnicode(
    const blink::WebString& host,
    const blink::WebString& languages) {
  return net::IDNToUnicode(host.utf8(), languages.utf8());
}

//------------------------------------------------------------------------------

void RendererWebKitPlatformSupportImpl::setDeviceMotionListener(
    blink::WebDeviceMotionListener* listener) {
  if (g_test_device_motion_data == 0) {
    if (!device_motion_event_pump_) {
      device_motion_event_pump_.reset(new DeviceMotionEventPump);
      device_motion_event_pump_->Attach(RenderThreadImpl::current());
    }
    device_motion_event_pump_->SetListener(listener);
  } else if (listener) {
    // Testing mode: just echo the test data to the listener.
    base::MessageLoopProxy::current()->PostTask(
        FROM_HERE,
        base::Bind(&blink::WebDeviceMotionListener::didChangeDeviceMotion,
                   base::Unretained(listener),
                   g_test_device_motion_data.Get()));
  }
}

// static
void RendererWebKitPlatformSupportImpl::SetMockDeviceMotionDataForTesting(
    const blink::WebDeviceMotionData& data) {
  g_test_device_motion_data.Get() = data;
}

//------------------------------------------------------------------------------

void RendererWebKitPlatformSupportImpl::setDeviceOrientationListener(
    blink::WebDeviceOrientationListener* listener) {
  if (g_test_device_orientation_data == 0) {
    if (!device_orientation_event_pump_) {
      device_orientation_event_pump_.reset(new DeviceOrientationEventPump);
      device_orientation_event_pump_->Attach(RenderThreadImpl::current());
    }
    device_orientation_event_pump_->SetListener(listener);
  } else if (listener) {
    // Testing mode: just echo the test data to the listener.
    base::MessageLoopProxy::current()->PostTask(
        FROM_HERE,
        base::Bind(
            &blink::WebDeviceOrientationListener::didChangeDeviceOrientation,
            base::Unretained(listener),
            g_test_device_orientation_data.Get()));
  }
}

// static
void RendererWebKitPlatformSupportImpl::SetMockDeviceOrientationDataForTesting(
    const blink::WebDeviceOrientationData& data) {
  g_test_device_orientation_data.Get() = data;
}

//------------------------------------------------------------------------------

void RendererWebKitPlatformSupportImpl::vibrate(unsigned int milliseconds) {
  RenderThread::Get()->Send(
      new ViewHostMsg_Vibrate(base::checked_cast<int64>(milliseconds)));
}

void RendererWebKitPlatformSupportImpl::cancelVibration() {
  RenderThread::Get()->Send(new ViewHostMsg_CancelVibration());
}

//------------------------------------------------------------------------------

void RendererWebKitPlatformSupportImpl::setScreenOrientationListener(
    blink::WebScreenOrientationListener* listener) {
  if (!(g_test_screen_orientation_value == 0)) {
    if (!listener)
      return;

    // When testing, we only pretend that the screen orientation is now set to
    // g_test_screen_orientation_value.
    base::MessageLoopProxy::current()->PostTask(
        FROM_HERE,
        base::Bind(
            &blink::WebScreenOrientationListener::didChangeScreenOrientation,
            base::Unretained(listener),
            g_test_screen_orientation_value.Get()));
    return;
  }

  if (!screen_orientation_dispatcher_) {
    screen_orientation_dispatcher_.reset(
        new ScreenOrientationDispatcher(RenderThread::Get()));
  }

  screen_orientation_dispatcher_->setListener(listener);
}

void RendererWebKitPlatformSupportImpl::lockOrientation(
    blink::WebScreenOrientations orientations) {
  // No-op if we are currently using mock values.
  if (!(g_test_screen_orientation_value == 0))
    return;
  RenderThread::Get()->Send(new ScreenOrientationHostMsg_Lock(orientations));
}

void RendererWebKitPlatformSupportImpl::unlockOrientation() {
  // No-op if we are currently using mock values.
  if (!(g_test_screen_orientation_value == 0))
    return;
  RenderThread::Get()->Send(new ScreenOrientationHostMsg_Unlock);
}

// static
void RendererWebKitPlatformSupportImpl::SetMockScreenOrientationForTesting(
    blink::WebScreenOrientation orientation) {
  g_test_screen_orientation_value.Get() = orientation;
}

//------------------------------------------------------------------------------

void RendererWebKitPlatformSupportImpl::queryStorageUsageAndQuota(
    const blink::WebURL& storage_partition,
    blink::WebStorageQuotaType type,
    blink::WebStorageQuotaCallbacks callbacks) {
  if (!thread_safe_sender_.get() || !quota_message_filter_.get())
    return;
  QuotaDispatcher::ThreadSpecificInstance(
      thread_safe_sender_.get(),
      quota_message_filter_.get())->QueryStorageUsageAndQuota(
          storage_partition,
          static_cast<quota::StorageType>(type),
          QuotaDispatcher::CreateWebStorageQuotaCallbacksWrapper(callbacks));
}

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

DEFINITIONS
