content/child/blink_platform

/* [<][>][^][v][top][bottom][index][help] */
This source file includes following definitions.
wait
signal
impl
GetInstance
Init
IsCachedValueValid
SetMemoryValue
ToMessageID
current_thread_slot_
createURLLoader
createSocketStreamHandle
createWebSocketHandle
userAgent
parseDataURL
cancelledError
createThread
currentThread
createWaitableEvent
waitMultipleEvents
decrementStatsCounter
incrementStatsCounter
histogramCustomCounts
histogramEnumeration
histogramSparse
getTraceCategoryEnabledFlag
getTraceSamplingState
addTraceEvent
updateTraceEventDuration
loadAudioSpatializationResource
loadResource
queryLocalizedString
queryLocalizedString
queryLocalizedString
queryLocalizedString
currentTime
monotonicallyIncreasingTime
cryptographicallyRandomValues
setSharedTimerFiredFunction
setSharedTimerFireInterval
stopSharedTimer
callOnMainThread
createFlingAnimationCurve
didStartWorkerRunLoop
didStopWorkerRunLoop
crypto
themeEngine
fallbackThemeEngine
databaseOpenFile
databaseDeleteFile
databaseGetFileAttributes
databaseGetFileSize
databaseGetSpaceAvailableForOrigin
signedPublicKeyAndChallengeString
CurrentProcessMetrics
getMemoryUsageMB
memoryUsageMB
actualMemoryUsageMB
physicalMemoryMB
numberOfProcessors
startHeapProfiling
stopHeapProfiling
dumpHeapProfiling
getHeapProfile
processMemorySizesInBytes
memoryAllocatorWasteInBytes
allocateAndLockDiscardableMemory
maxDecodedImageBytes
SetFlingCurveParameters
SuspendSharedTimer
ResumeSharedTimer
DestroyCurrentThread
// Copyright 2014 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/child/blink_platform_impl.h"

#include <math.h>

#include <vector>

#include "base/allocator/allocator_extension.h"
#include "base/bind.h"
#include "base/files/file_path.h"
#include "base/memory/scoped_ptr.h"
#include "base/memory/singleton.h"
#include "base/message_loop/message_loop.h"
#include "base/metrics/histogram.h"
#include "base/metrics/sparse_histogram.h"
#include "base/metrics/stats_counters.h"
#include "base/platform_file.h"
#include "base/process/process_metrics.h"
#include "base/rand_util.h"
#include "base/strings/string_number_conversions.h"
#include "base/strings/string_util.h"
#include "base/strings/utf_string_conversions.h"
#include "base/synchronization/lock.h"
#include "base/synchronization/waitable_event.h"
#include "base/sys_info.h"
#include "base/time/time.h"
#include "content/child/content_child_helpers.h"
#include "content/child/fling_curve_configuration.h"
#include "content/child/web_discardable_memory_impl.h"
#include "content/child/web_socket_stream_handle_impl.h"
#include "content/child/web_url_loader_impl.h"
#include "content/child/webcrypto/webcrypto_impl.h"
#include "content/child/websocket_bridge.h"
#include "content/child/webthread_impl.h"
#include "content/child/worker_task_runner.h"
#include "content/public/common/content_client.h"
#include "grit/blink_resources.h"
#include "grit/webkit_resources.h"
#include "grit/webkit_strings.h"
#include "net/base/data_url.h"
#include "net/base/mime_util.h"
#include "net/base/net_errors.h"
#include "third_party/WebKit/public/platform/WebData.h"
#include "third_party/WebKit/public/platform/WebString.h"
#include "third_party/WebKit/public/platform/WebWaitableEvent.h"
#include "third_party/WebKit/public/web/WebInputEvent.h"
#include "ui/base/layout.h"

#if defined(OS_ANDROID)
#include "base/android/sys_utils.h"
#include "content/child/fling_animator_impl_android.h"
#endif

#if !defined(NO_TCMALLOC) && defined(USE_TCMALLOC) && !defined(OS_WIN)
#include "third_party/tcmalloc/chromium/src/gperftools/heap-profiler.h"
#endif

using blink::WebData;
using blink::WebFallbackThemeEngine;
using blink::WebLocalizedString;
using blink::WebString;
using blink::WebSocketStreamHandle;
using blink::WebThemeEngine;
using blink::WebURL;
using blink::WebURLError;
using blink::WebURLLoader;

namespace content {

namespace {

class WebWaitableEventImpl : public blink::WebWaitableEvent {
 public:
  WebWaitableEventImpl() : impl_(new base::WaitableEvent(false, false)) {}
  virtual ~WebWaitableEventImpl() {}

  virtual void wait() { impl_->Wait(); }
  virtual void signal() { impl_->Signal(); }

  base::WaitableEvent* impl() {
    return impl_.get();
  }

 private:
  scoped_ptr<base::WaitableEvent> impl_;
  DISALLOW_COPY_AND_ASSIGN(WebWaitableEventImpl);
};

// A simple class to cache the memory usage for a given amount of time.
class MemoryUsageCache {
 public:
  // Retrieves the Singleton.
  static MemoryUsageCache* GetInstance() {
    return Singleton<MemoryUsageCache>::get();
  }

  MemoryUsageCache() : memory_value_(0) { Init(); }
  ~MemoryUsageCache() {}

  void Init() {
    const unsigned int kCacheSeconds = 1;
    cache_valid_time_ = base::TimeDelta::FromSeconds(kCacheSeconds);
  }

  // Returns true if the cached value is fresh.
  // Returns false if the cached value is stale, or if |cached_value| is NULL.
  bool IsCachedValueValid(size_t* cached_value) {
    base::AutoLock scoped_lock(lock_);
    if (!cached_value)
      return false;
    if (base::Time::Now() - last_updated_time_ > cache_valid_time_)
      return false;
    *cached_value = memory_value_;
    return true;
  };

  // Setter for |memory_value_|, refreshes |last_updated_time_|.
  void SetMemoryValue(const size_t value) {
    base::AutoLock scoped_lock(lock_);
    memory_value_ = value;
    last_updated_time_ = base::Time::Now();
  }

 private:
  // The cached memory value.
  size_t memory_value_;

  // How long the cached value should remain valid.
  base::TimeDelta cache_valid_time_;

  // The last time the cached value was updated.
  base::Time last_updated_time_;

  base::Lock lock_;
};

}  // namespace

static int ToMessageID(WebLocalizedString::Name name) {
  switch (name) {
    case WebLocalizedString::AXAMPMFieldText:
      return IDS_AX_AM_PM_FIELD_TEXT;
    case WebLocalizedString::AXButtonActionVerb:
      return IDS_AX_BUTTON_ACTION_VERB;
    case WebLocalizedString::AXCheckedCheckBoxActionVerb:
      return IDS_AX_CHECKED_CHECK_BOX_ACTION_VERB;
    case WebLocalizedString::AXDateTimeFieldEmptyValueText:
      return IDS_AX_DATE_TIME_FIELD_EMPTY_VALUE_TEXT;
    case WebLocalizedString::AXDayOfMonthFieldText:
      return IDS_AX_DAY_OF_MONTH_FIELD_TEXT;
    case WebLocalizedString::AXHeadingText:
      return IDS_AX_ROLE_HEADING;
    case WebLocalizedString::AXHourFieldText:
      return IDS_AX_HOUR_FIELD_TEXT;
    case WebLocalizedString::AXImageMapText:
      return IDS_AX_ROLE_IMAGE_MAP;
    case WebLocalizedString::AXLinkActionVerb:
      return IDS_AX_LINK_ACTION_VERB;
    case WebLocalizedString::AXLinkText:
      return IDS_AX_ROLE_LINK;
    case WebLocalizedString::AXListMarkerText:
      return IDS_AX_ROLE_LIST_MARKER;
    case WebLocalizedString::AXMediaDefault:
      return IDS_AX_MEDIA_DEFAULT;
    case WebLocalizedString::AXMediaAudioElement:
      return IDS_AX_MEDIA_AUDIO_ELEMENT;
    case WebLocalizedString::AXMediaVideoElement:
      return IDS_AX_MEDIA_VIDEO_ELEMENT;
    case WebLocalizedString::AXMediaMuteButton:
      return IDS_AX_MEDIA_MUTE_BUTTON;
    case WebLocalizedString::AXMediaUnMuteButton:
      return IDS_AX_MEDIA_UNMUTE_BUTTON;
    case WebLocalizedString::AXMediaPlayButton:
      return IDS_AX_MEDIA_PLAY_BUTTON;
    case WebLocalizedString::AXMediaPauseButton:
      return IDS_AX_MEDIA_PAUSE_BUTTON;
    case WebLocalizedString::AXMediaSlider:
      return IDS_AX_MEDIA_SLIDER;
    case WebLocalizedString::AXMediaSliderThumb:
      return IDS_AX_MEDIA_SLIDER_THUMB;
    case WebLocalizedString::AXMediaCurrentTimeDisplay:
      return IDS_AX_MEDIA_CURRENT_TIME_DISPLAY;
    case WebLocalizedString::AXMediaTimeRemainingDisplay:
      return IDS_AX_MEDIA_TIME_REMAINING_DISPLAY;
    case WebLocalizedString::AXMediaStatusDisplay:
      return IDS_AX_MEDIA_STATUS_DISPLAY;
    case WebLocalizedString::AXMediaEnterFullscreenButton:
      return IDS_AX_MEDIA_ENTER_FULL_SCREEN_BUTTON;
    case WebLocalizedString::AXMediaExitFullscreenButton:
      return IDS_AX_MEDIA_EXIT_FULL_SCREEN_BUTTON;
    case WebLocalizedString::AXMediaShowClosedCaptionsButton:
      return IDS_AX_MEDIA_SHOW_CLOSED_CAPTIONS_BUTTON;
    case WebLocalizedString::AXMediaHideClosedCaptionsButton:
      return IDS_AX_MEDIA_HIDE_CLOSED_CAPTIONS_BUTTON;
    case WebLocalizedString::AXMediaAudioElementHelp:
      return IDS_AX_MEDIA_AUDIO_ELEMENT_HELP;
    case WebLocalizedString::AXMediaVideoElementHelp:
      return IDS_AX_MEDIA_VIDEO_ELEMENT_HELP;
    case WebLocalizedString::AXMediaMuteButtonHelp:
      return IDS_AX_MEDIA_MUTE_BUTTON_HELP;
    case WebLocalizedString::AXMediaUnMuteButtonHelp:
      return IDS_AX_MEDIA_UNMUTE_BUTTON_HELP;
    case WebLocalizedString::AXMediaPlayButtonHelp:
      return IDS_AX_MEDIA_PLAY_BUTTON_HELP;
    case WebLocalizedString::AXMediaPauseButtonHelp:
      return IDS_AX_MEDIA_PAUSE_BUTTON_HELP;
    case WebLocalizedString::AXMediaSliderHelp:
      return IDS_AX_MEDIA_SLIDER_HELP;
    case WebLocalizedString::AXMediaSliderThumbHelp:
      return IDS_AX_MEDIA_SLIDER_THUMB_HELP;
    case WebLocalizedString::AXMediaCurrentTimeDisplayHelp:
      return IDS_AX_MEDIA_CURRENT_TIME_DISPLAY_HELP;
    case WebLocalizedString::AXMediaTimeRemainingDisplayHelp:
      return IDS_AX_MEDIA_TIME_REMAINING_DISPLAY_HELP;
    case WebLocalizedString::AXMediaStatusDisplayHelp:
      return IDS_AX_MEDIA_STATUS_DISPLAY_HELP;
    case WebLocalizedString::AXMediaEnterFullscreenButtonHelp:
      return IDS_AX_MEDIA_ENTER_FULL_SCREEN_BUTTON_HELP;
    case WebLocalizedString::AXMediaExitFullscreenButtonHelp:
      return IDS_AX_MEDIA_EXIT_FULL_SCREEN_BUTTON_HELP;
    case WebLocalizedString::AXMediaShowClosedCaptionsButtonHelp:
      return IDS_AX_MEDIA_SHOW_CLOSED_CAPTIONS_BUTTON_HELP;
    case WebLocalizedString::AXMediaHideClosedCaptionsButtonHelp:
      return IDS_AX_MEDIA_HIDE_CLOSED_CAPTIONS_BUTTON_HELP;
    case WebLocalizedString::AXMillisecondFieldText:
      return IDS_AX_MILLISECOND_FIELD_TEXT;
    case WebLocalizedString::AXMinuteFieldText:
      return IDS_AX_MINUTE_FIELD_TEXT;
    case WebLocalizedString::AXMonthFieldText:
      return IDS_AX_MONTH_FIELD_TEXT;
    case WebLocalizedString::AXRadioButtonActionVerb:
      return IDS_AX_RADIO_BUTTON_ACTION_VERB;
    case WebLocalizedString::AXSecondFieldText:
      return IDS_AX_SECOND_FIELD_TEXT;
    case WebLocalizedString::AXTextFieldActionVerb:
      return IDS_AX_TEXT_FIELD_ACTION_VERB;
    case WebLocalizedString::AXUncheckedCheckBoxActionVerb:
      return IDS_AX_UNCHECKED_CHECK_BOX_ACTION_VERB;
    case WebLocalizedString::AXWebAreaText:
      return IDS_AX_ROLE_WEB_AREA;
    case WebLocalizedString::AXWeekOfYearFieldText:
      return IDS_AX_WEEK_OF_YEAR_FIELD_TEXT;
    case WebLocalizedString::AXYearFieldText:
      return IDS_AX_YEAR_FIELD_TEXT;
    case WebLocalizedString::CalendarClear:
      return IDS_FORM_CALENDAR_CLEAR;
    case WebLocalizedString::CalendarToday:
      return IDS_FORM_CALENDAR_TODAY;
    case WebLocalizedString::DateFormatDayInMonthLabel:
      return IDS_FORM_DATE_FORMAT_DAY_IN_MONTH;
    case WebLocalizedString::DateFormatMonthLabel:
      return IDS_FORM_DATE_FORMAT_MONTH;
    case WebLocalizedString::DateFormatYearLabel:
      return IDS_FORM_DATE_FORMAT_YEAR;
    case WebLocalizedString::DetailsLabel:
      return IDS_DETAILS_WITHOUT_SUMMARY_LABEL;
    case WebLocalizedString::FileButtonChooseFileLabel:
      return IDS_FORM_FILE_BUTTON_LABEL;
    case WebLocalizedString::FileButtonChooseMultipleFilesLabel:
      return IDS_FORM_MULTIPLE_FILES_BUTTON_LABEL;
    case WebLocalizedString::FileButtonNoFileSelectedLabel:
      return IDS_FORM_FILE_NO_FILE_LABEL;
    case WebLocalizedString::InputElementAltText:
      return IDS_FORM_INPUT_ALT;
    case WebLocalizedString::KeygenMenuHighGradeKeySize:
      return IDS_KEYGEN_HIGH_GRADE_KEY;
    case WebLocalizedString::KeygenMenuMediumGradeKeySize:
      return IDS_KEYGEN_MED_GRADE_KEY;
    case WebLocalizedString::MissingPluginText:
      return IDS_PLUGIN_INITIALIZATION_ERROR;
    case WebLocalizedString::MultipleFileUploadText:
      return IDS_FORM_FILE_MULTIPLE_UPLOAD;
    case WebLocalizedString::OtherColorLabel:
      return IDS_FORM_OTHER_COLOR_LABEL;
    case WebLocalizedString::OtherDateLabel:
        return IDS_FORM_OTHER_DATE_LABEL;
    case WebLocalizedString::OtherMonthLabel:
      return IDS_FORM_OTHER_MONTH_LABEL;
    case WebLocalizedString::OtherTimeLabel:
      return IDS_FORM_OTHER_TIME_LABEL;
    case WebLocalizedString::OtherWeekLabel:
      return IDS_FORM_OTHER_WEEK_LABEL;
    case WebLocalizedString::PlaceholderForDayOfMonthField:
      return IDS_FORM_PLACEHOLDER_FOR_DAY_OF_MONTH_FIELD;
    case WebLocalizedString::PlaceholderForMonthField:
      return IDS_FORM_PLACEHOLDER_FOR_MONTH_FIELD;
    case WebLocalizedString::PlaceholderForYearField:
      return IDS_FORM_PLACEHOLDER_FOR_YEAR_FIELD;
    case WebLocalizedString::ResetButtonDefaultLabel:
      return IDS_FORM_RESET_LABEL;
    case WebLocalizedString::SearchableIndexIntroduction:
      return IDS_SEARCHABLE_INDEX_INTRO;
    case WebLocalizedString::SearchMenuClearRecentSearchesText:
      return IDS_RECENT_SEARCHES_CLEAR;
    case WebLocalizedString::SearchMenuNoRecentSearchesText:
      return IDS_RECENT_SEARCHES_NONE;
    case WebLocalizedString::SearchMenuRecentSearchesText:
      return IDS_RECENT_SEARCHES;
    case WebLocalizedString::SubmitButtonDefaultLabel:
      return IDS_FORM_SUBMIT_LABEL;
    case WebLocalizedString::ThisMonthButtonLabel:
      return IDS_FORM_THIS_MONTH_LABEL;
    case WebLocalizedString::ThisWeekButtonLabel:
      return IDS_FORM_THIS_WEEK_LABEL;
    case WebLocalizedString::ValidationBadInputForDateTime:
      return IDS_FORM_VALIDATION_BAD_INPUT_DATETIME;
    case WebLocalizedString::ValidationBadInputForNumber:
      return IDS_FORM_VALIDATION_BAD_INPUT_NUMBER;
    case WebLocalizedString::ValidationPatternMismatch:
      return IDS_FORM_VALIDATION_PATTERN_MISMATCH;
    case WebLocalizedString::ValidationRangeOverflow:
      return IDS_FORM_VALIDATION_RANGE_OVERFLOW;
    case WebLocalizedString::ValidationRangeOverflowDateTime:
      return IDS_FORM_VALIDATION_RANGE_OVERFLOW_DATETIME;
    case WebLocalizedString::ValidationRangeUnderflow:
      return IDS_FORM_VALIDATION_RANGE_UNDERFLOW;
    case WebLocalizedString::ValidationRangeUnderflowDateTime:
      return IDS_FORM_VALIDATION_RANGE_UNDERFLOW_DATETIME;
    case WebLocalizedString::ValidationStepMismatch:
      return IDS_FORM_VALIDATION_STEP_MISMATCH;
    case WebLocalizedString::ValidationStepMismatchCloseToLimit:
      return IDS_FORM_VALIDATION_STEP_MISMATCH_CLOSE_TO_LIMIT;
    case WebLocalizedString::ValidationTooLong:
      return IDS_FORM_VALIDATION_TOO_LONG;
    case WebLocalizedString::ValidationTypeMismatch:
      return IDS_FORM_VALIDATION_TYPE_MISMATCH;
    case WebLocalizedString::ValidationTypeMismatchForEmail:
      return IDS_FORM_VALIDATION_TYPE_MISMATCH_EMAIL;
    case WebLocalizedString::ValidationTypeMismatchForEmailEmpty:
      return IDS_FORM_VALIDATION_TYPE_MISMATCH_EMAIL_EMPTY;
    case WebLocalizedString::ValidationTypeMismatchForEmailEmptyDomain:
      return IDS_FORM_VALIDATION_TYPE_MISMATCH_EMAIL_EMPTY_DOMAIN;
    case WebLocalizedString::ValidationTypeMismatchForEmailEmptyLocal:
      return IDS_FORM_VALIDATION_TYPE_MISMATCH_EMAIL_EMPTY_LOCAL;
    case WebLocalizedString::ValidationTypeMismatchForEmailInvalidDomain:
      return IDS_FORM_VALIDATION_TYPE_MISMATCH_EMAIL_INVALID_DOMAIN;
    case WebLocalizedString::ValidationTypeMismatchForEmailInvalidDots:
      return IDS_FORM_VALIDATION_TYPE_MISMATCH_EMAIL_INVALID_DOTS;
    case WebLocalizedString::ValidationTypeMismatchForEmailInvalidLocal:
      return IDS_FORM_VALIDATION_TYPE_MISMATCH_EMAIL_INVALID_LOCAL;
    case WebLocalizedString::ValidationTypeMismatchForEmailNoAtSign:
      return IDS_FORM_VALIDATION_TYPE_MISMATCH_EMAIL_NO_AT_SIGN;
    case WebLocalizedString::ValidationTypeMismatchForMultipleEmail:
      return IDS_FORM_VALIDATION_TYPE_MISMATCH_MULTIPLE_EMAIL;
    case WebLocalizedString::ValidationTypeMismatchForURL:
      return IDS_FORM_VALIDATION_TYPE_MISMATCH_URL;
    case WebLocalizedString::ValidationValueMissing:
      return IDS_FORM_VALIDATION_VALUE_MISSING;
    case WebLocalizedString::ValidationValueMissingForCheckbox:
      return IDS_FORM_VALIDATION_VALUE_MISSING_CHECKBOX;
    case WebLocalizedString::ValidationValueMissingForFile:
      return IDS_FORM_VALIDATION_VALUE_MISSING_FILE;
    case WebLocalizedString::ValidationValueMissingForMultipleFile:
      return IDS_FORM_VALIDATION_VALUE_MISSING_MULTIPLE_FILE;
    case WebLocalizedString::ValidationValueMissingForRadio:
      return IDS_FORM_VALIDATION_VALUE_MISSING_RADIO;
    case WebLocalizedString::ValidationValueMissingForSelect:
      return IDS_FORM_VALIDATION_VALUE_MISSING_SELECT;
    case WebLocalizedString::WeekFormatTemplate:
      return IDS_FORM_INPUT_WEEK_TEMPLATE;
    case WebLocalizedString::WeekNumberLabel:
      return IDS_FORM_WEEK_NUMBER_LABEL;
    // This "default:" line exists to avoid compile warnings about enum
    // coverage when we add a new symbol to WebLocalizedString.h in WebKit.
    // After a planned WebKit patch is landed, we need to add a case statement
    // for the added symbol here.
    default:
      break;
  }
  return -1;
}

BlinkPlatformImpl::BlinkPlatformImpl()
    : main_loop_(base::MessageLoop::current()),
      shared_timer_func_(NULL),
      shared_timer_fire_time_(0.0),
      shared_timer_fire_time_was_set_while_suspended_(false),
      shared_timer_suspended_(0),
      fling_curve_configuration_(new FlingCurveConfiguration),
      current_thread_slot_(&DestroyCurrentThread) {}

BlinkPlatformImpl::~BlinkPlatformImpl() {
}

WebURLLoader* BlinkPlatformImpl::createURLLoader() {
  return new WebURLLoaderImpl;
}

WebSocketStreamHandle* BlinkPlatformImpl::createSocketStreamHandle() {
  return new WebSocketStreamHandleImpl;
}

blink::WebSocketHandle* BlinkPlatformImpl::createWebSocketHandle() {
  return new WebSocketBridge;
}

WebString BlinkPlatformImpl::userAgent() {
  return WebString::fromUTF8(GetContentClient()->GetUserAgent());
}

WebData BlinkPlatformImpl::parseDataURL(const WebURL& url,
                                        WebString& mimetype_out,
                                        WebString& charset_out) {
  std::string mime_type, char_set, data;
  if (net::DataURL::Parse(url, &mime_type, &char_set, &data)
      && net::IsSupportedMimeType(mime_type)) {
    mimetype_out = WebString::fromUTF8(mime_type);
    charset_out = WebString::fromUTF8(char_set);
    return data;
  }
  return WebData();
}

WebURLError BlinkPlatformImpl::cancelledError(
    const WebURL& unreachableURL) const {
  return WebURLLoaderImpl::CreateError(unreachableURL, false, net::ERR_ABORTED);
}

blink::WebThread* BlinkPlatformImpl::createThread(const char* name) {
  return new WebThreadImpl(name);
}

blink::WebThread* BlinkPlatformImpl::currentThread() {
  WebThreadImplForMessageLoop* thread =
      static_cast<WebThreadImplForMessageLoop*>(current_thread_slot_.Get());
  if (thread)
    return (thread);

  scoped_refptr<base::MessageLoopProxy> message_loop =
      base::MessageLoopProxy::current();
  if (!message_loop.get())
    return NULL;

  thread = new WebThreadImplForMessageLoop(message_loop.get());
  current_thread_slot_.Set(thread);
  return thread;
}

blink::WebWaitableEvent* BlinkPlatformImpl::createWaitableEvent() {
  return new WebWaitableEventImpl();
}

blink::WebWaitableEvent* BlinkPlatformImpl::waitMultipleEvents(
    const blink::WebVector<blink::WebWaitableEvent*>& web_events) {
  std::vector<base::WaitableEvent*> events;
  for (size_t i = 0; i < web_events.size(); ++i)
    events.push_back(static_cast<WebWaitableEventImpl*>(web_events[i])->impl());
  size_t idx = base::WaitableEvent::WaitMany(
      vector_as_array(&events), events.size());
  DCHECK_LT(idx, web_events.size());
  return web_events[idx];
}

void BlinkPlatformImpl::decrementStatsCounter(const char* name) {
  base::StatsCounter(name).Decrement();
}

void BlinkPlatformImpl::incrementStatsCounter(const char* name) {
  base::StatsCounter(name).Increment();
}

void BlinkPlatformImpl::histogramCustomCounts(
    const char* name, int sample, int min, int max, int bucket_count) {
  // Copied from histogram macro, but without the static variable caching
  // the histogram because name is dynamic.
  base::HistogramBase* counter =
      base::Histogram::FactoryGet(name, min, max, bucket_count,
          base::HistogramBase::kUmaTargetedHistogramFlag);
  DCHECK_EQ(name, counter->histogram_name());
  counter->Add(sample);
}

void BlinkPlatformImpl::histogramEnumeration(
    const char* name, int sample, int boundary_value) {
  // Copied from histogram macro, but without the static variable caching
  // the histogram because name is dynamic.
  base::HistogramBase* counter =
      base::LinearHistogram::FactoryGet(name, 1, boundary_value,
          boundary_value + 1, base::HistogramBase::kUmaTargetedHistogramFlag);
  DCHECK_EQ(name, counter->histogram_name());
  counter->Add(sample);
}

void BlinkPlatformImpl::histogramSparse(const char* name, int sample) {
  // For sparse histograms, we can use the macro, as it does not incorporate a
  // static.
  UMA_HISTOGRAM_SPARSE_SLOWLY(name, sample);
}

const unsigned char* BlinkPlatformImpl::getTraceCategoryEnabledFlag(
    const char* category_group) {
  return TRACE_EVENT_API_GET_CATEGORY_GROUP_ENABLED(category_group);
}

long* BlinkPlatformImpl::getTraceSamplingState(
    const unsigned thread_bucket) {
  switch (thread_bucket) {
    case 0:
      return reinterpret_cast<long*>(&TRACE_EVENT_API_THREAD_BUCKET(0));
    case 1:
      return reinterpret_cast<long*>(&TRACE_EVENT_API_THREAD_BUCKET(1));
    case 2:
      return reinterpret_cast<long*>(&TRACE_EVENT_API_THREAD_BUCKET(2));
    default:
      NOTREACHED() << "Unknown thread bucket type.";
  }
  return NULL;
}

COMPILE_ASSERT(
    sizeof(blink::Platform::TraceEventHandle) ==
        sizeof(base::debug::TraceEventHandle),
    TraceEventHandle_types_must_be_same_size);

blink::Platform::TraceEventHandle BlinkPlatformImpl::addTraceEvent(
    char phase,
    const unsigned char* category_group_enabled,
    const char* name,
    unsigned long long id,
    int num_args,
    const char** arg_names,
    const unsigned char* arg_types,
    const unsigned long long* arg_values,
    unsigned char flags) {
  base::debug::TraceEventHandle handle = TRACE_EVENT_API_ADD_TRACE_EVENT(
      phase, category_group_enabled, name, id,
      num_args, arg_names, arg_types, arg_values, NULL, flags);
  blink::Platform::TraceEventHandle result;
  memcpy(&result, &handle, sizeof(result));
  return result;
}

void BlinkPlatformImpl::updateTraceEventDuration(
    const unsigned char* category_group_enabled,
    const char* name,
    TraceEventHandle handle) {
  base::debug::TraceEventHandle traceEventHandle;
  memcpy(&traceEventHandle, &handle, sizeof(handle));
  TRACE_EVENT_API_UPDATE_TRACE_EVENT_DURATION(
      category_group_enabled, name, traceEventHandle);
}

namespace {

WebData loadAudioSpatializationResource(const char* name) {
#ifdef IDR_AUDIO_SPATIALIZATION_COMPOSITE
  if (!strcmp(name, "Composite")) {
    base::StringPiece resource = GetContentClient()->GetDataResource(
        IDR_AUDIO_SPATIALIZATION_COMPOSITE, ui::SCALE_FACTOR_NONE);
    return WebData(resource.data(), resource.size());
  }
#endif

#ifdef IDR_AUDIO_SPATIALIZATION_T000_P000
  const size_t kExpectedSpatializationNameLength = 31;
  if (strlen(name) != kExpectedSpatializationNameLength) {
    return WebData();
  }

  // Extract the azimuth and elevation from the resource name.
  int azimuth = 0;
  int elevation = 0;
  int values_parsed =
      sscanf(name, "IRC_Composite_C_R0195_T%3d_P%3d", &azimuth, &elevation);
  if (values_parsed != 2) {
    return WebData();
  }

  // The resource index values go through the elevations first, then azimuths.
  const int kAngleSpacing = 15;

  // 0 <= elevation <= 90 (or 315 <= elevation <= 345)
  // in increments of 15 degrees.
  int elevation_index =
      elevation <= 90 ? elevation / kAngleSpacing :
      7 + (elevation - 315) / kAngleSpacing;
  bool is_elevation_index_good = 0 <= elevation_index && elevation_index < 10;

  // 0 <= azimuth < 360 in increments of 15 degrees.
  int azimuth_index = azimuth / kAngleSpacing;
  bool is_azimuth_index_good = 0 <= azimuth_index && azimuth_index < 24;

  const int kNumberOfElevations = 10;
  const int kNumberOfAudioResources = 240;
  int resource_index = kNumberOfElevations * azimuth_index + elevation_index;
  bool is_resource_index_good = 0 <= resource_index &&
      resource_index < kNumberOfAudioResources;

  if (is_azimuth_index_good && is_elevation_index_good &&
      is_resource_index_good) {
    const int kFirstAudioResourceIndex = IDR_AUDIO_SPATIALIZATION_T000_P000;
    base::StringPiece resource = GetContentClient()->GetDataResource(
        kFirstAudioResourceIndex + resource_index, ui::SCALE_FACTOR_NONE);
    return WebData(resource.data(), resource.size());
  }
#endif  // IDR_AUDIO_SPATIALIZATION_T000_P000

  NOTREACHED();
  return WebData();
}

struct DataResource {
  const char* name;
  int id;
  ui::ScaleFactor scale_factor;
};

const DataResource kDataResources[] = {
  { "missingImage", IDR_BROKENIMAGE, ui::SCALE_FACTOR_100P },
  { "missingImage@2x", IDR_BROKENIMAGE, ui::SCALE_FACTOR_200P },
  { "mediaplayerPause", IDR_MEDIAPLAYER_PAUSE_BUTTON, ui::SCALE_FACTOR_100P },
  { "mediaplayerPauseHover",
    IDR_MEDIAPLAYER_PAUSE_BUTTON_HOVER, ui::SCALE_FACTOR_100P },
  { "mediaplayerPauseDown",
    IDR_MEDIAPLAYER_PAUSE_BUTTON_DOWN, ui::SCALE_FACTOR_100P },
  { "mediaplayerPlay", IDR_MEDIAPLAYER_PLAY_BUTTON, ui::SCALE_FACTOR_100P },
  { "mediaplayerPlayHover",
    IDR_MEDIAPLAYER_PLAY_BUTTON_HOVER, ui::SCALE_FACTOR_100P },
  { "mediaplayerPlayDown",
    IDR_MEDIAPLAYER_PLAY_BUTTON_DOWN, ui::SCALE_FACTOR_100P },
  { "mediaplayerPlayDisabled",
    IDR_MEDIAPLAYER_PLAY_BUTTON_DISABLED, ui::SCALE_FACTOR_100P },
  { "mediaplayerSoundLevel3",
    IDR_MEDIAPLAYER_SOUND_LEVEL3_BUTTON, ui::SCALE_FACTOR_100P },
  { "mediaplayerSoundLevel3Hover",
    IDR_MEDIAPLAYER_SOUND_LEVEL3_BUTTON_HOVER, ui::SCALE_FACTOR_100P },
  { "mediaplayerSoundLevel3Down",
    IDR_MEDIAPLAYER_SOUND_LEVEL3_BUTTON_DOWN, ui::SCALE_FACTOR_100P },
  { "mediaplayerSoundLevel2",
    IDR_MEDIAPLAYER_SOUND_LEVEL2_BUTTON, ui::SCALE_FACTOR_100P },
  { "mediaplayerSoundLevel2Hover",
    IDR_MEDIAPLAYER_SOUND_LEVEL2_BUTTON_HOVER, ui::SCALE_FACTOR_100P },
  { "mediaplayerSoundLevel2Down",
    IDR_MEDIAPLAYER_SOUND_LEVEL2_BUTTON_DOWN, ui::SCALE_FACTOR_100P },
  { "mediaplayerSoundLevel1",
    IDR_MEDIAPLAYER_SOUND_LEVEL1_BUTTON, ui::SCALE_FACTOR_100P },
  { "mediaplayerSoundLevel1Hover",
    IDR_MEDIAPLAYER_SOUND_LEVEL1_BUTTON_HOVER, ui::SCALE_FACTOR_100P },
  { "mediaplayerSoundLevel1Down",
    IDR_MEDIAPLAYER_SOUND_LEVEL1_BUTTON_DOWN, ui::SCALE_FACTOR_100P },
  { "mediaplayerSoundLevel0",
    IDR_MEDIAPLAYER_SOUND_LEVEL0_BUTTON, ui::SCALE_FACTOR_100P },
  { "mediaplayerSoundLevel0Hover",
    IDR_MEDIAPLAYER_SOUND_LEVEL0_BUTTON_HOVER, ui::SCALE_FACTOR_100P },
  { "mediaplayerSoundLevel0Down",
    IDR_MEDIAPLAYER_SOUND_LEVEL0_BUTTON_DOWN, ui::SCALE_FACTOR_100P },
  { "mediaplayerSoundDisabled",
    IDR_MEDIAPLAYER_SOUND_DISABLED, ui::SCALE_FACTOR_100P },
  { "mediaplayerSliderThumb",
    IDR_MEDIAPLAYER_SLIDER_THUMB, ui::SCALE_FACTOR_100P },
  { "mediaplayerSliderThumbHover",
    IDR_MEDIAPLAYER_SLIDER_THUMB_HOVER, ui::SCALE_FACTOR_100P },
  { "mediaplayerSliderThumbDown",
    IDR_MEDIAPLAYER_SLIDER_THUMB_DOWN, ui::SCALE_FACTOR_100P },
  { "mediaplayerVolumeSliderThumb",
    IDR_MEDIAPLAYER_VOLUME_SLIDER_THUMB, ui::SCALE_FACTOR_100P },
  { "mediaplayerVolumeSliderThumbHover",
    IDR_MEDIAPLAYER_VOLUME_SLIDER_THUMB_HOVER, ui::SCALE_FACTOR_100P },
  { "mediaplayerVolumeSliderThumbDown",
    IDR_MEDIAPLAYER_VOLUME_SLIDER_THUMB_DOWN, ui::SCALE_FACTOR_100P },
  { "mediaplayerVolumeSliderThumbDisabled",
    IDR_MEDIAPLAYER_VOLUME_SLIDER_THUMB_DISABLED, ui::SCALE_FACTOR_100P },
  { "mediaplayerClosedCaption",
    IDR_MEDIAPLAYER_CLOSEDCAPTION_BUTTON, ui::SCALE_FACTOR_100P },
  { "mediaplayerClosedCaptionHover",
    IDR_MEDIAPLAYER_CLOSEDCAPTION_BUTTON_HOVER, ui::SCALE_FACTOR_100P },
  { "mediaplayerClosedCaptionDown",
    IDR_MEDIAPLAYER_CLOSEDCAPTION_BUTTON_DOWN, ui::SCALE_FACTOR_100P },
  { "mediaplayerClosedCaptionDisabled",
    IDR_MEDIAPLAYER_CLOSEDCAPTION_BUTTON_DISABLED, ui::SCALE_FACTOR_100P },
  { "mediaplayerFullscreen",
    IDR_MEDIAPLAYER_FULLSCREEN_BUTTON, ui::SCALE_FACTOR_100P },
  { "mediaplayerFullscreenHover",
    IDR_MEDIAPLAYER_FULLSCREEN_BUTTON_HOVER, ui::SCALE_FACTOR_100P },
  { "mediaplayerFullscreenDown",
    IDR_MEDIAPLAYER_FULLSCREEN_BUTTON_DOWN, ui::SCALE_FACTOR_100P },
  { "mediaplayerFullscreenDisabled",
    IDR_MEDIAPLAYER_FULLSCREEN_BUTTON_DISABLED, ui::SCALE_FACTOR_100P },
#if defined(OS_ANDROID)
  { "mediaplayerOverlayPlay",
    IDR_MEDIAPLAYER_OVERLAY_PLAY_BUTTON, ui::SCALE_FACTOR_100P },
#endif
#if defined(OS_MACOSX)
  { "overhangPattern", IDR_OVERHANG_PATTERN, ui::SCALE_FACTOR_100P },
  { "overhangShadow", IDR_OVERHANG_SHADOW, ui::SCALE_FACTOR_100P },
#endif
  { "panIcon", IDR_PAN_SCROLL_ICON, ui::SCALE_FACTOR_100P },
  { "searchCancel", IDR_SEARCH_CANCEL, ui::SCALE_FACTOR_100P },
  { "searchCancelPressed", IDR_SEARCH_CANCEL_PRESSED, ui::SCALE_FACTOR_100P },
  { "searchMagnifier", IDR_SEARCH_MAGNIFIER, ui::SCALE_FACTOR_100P },
  { "searchMagnifierResults",
    IDR_SEARCH_MAGNIFIER_RESULTS, ui::SCALE_FACTOR_100P },
  { "textAreaResizeCorner", IDR_TEXTAREA_RESIZER, ui::SCALE_FACTOR_100P },
  { "textAreaResizeCorner@2x", IDR_TEXTAREA_RESIZER, ui::SCALE_FACTOR_200P },
  { "inputSpeech", IDR_INPUT_SPEECH, ui::SCALE_FACTOR_100P },
  { "inputSpeechRecording", IDR_INPUT_SPEECH_RECORDING, ui::SCALE_FACTOR_100P },
  { "inputSpeechWaiting", IDR_INPUT_SPEECH_WAITING, ui::SCALE_FACTOR_100P },
  { "generatePassword", IDR_PASSWORD_GENERATION_ICON, ui::SCALE_FACTOR_100P },
  { "generatePasswordHover",
    IDR_PASSWORD_GENERATION_ICON_HOVER, ui::SCALE_FACTOR_100P },
  { "syntheticTouchCursor",
    IDR_SYNTHETIC_TOUCH_CURSOR, ui::SCALE_FACTOR_100P },
};

}  // namespace

WebData BlinkPlatformImpl::loadResource(const char* name) {
  // Some clients will call into this method with an empty |name| when they have
  // optional resources.  For example, the PopupMenuChromium code can have icons
  // for some Autofill items but not for others.
  if (!strlen(name))
    return WebData();

  // Check the name prefix to see if it's an audio resource.
  if (StartsWithASCII(name, "IRC_Composite", true) ||
      StartsWithASCII(name, "Composite", true))
    return loadAudioSpatializationResource(name);

  // TODO(flackr): We should use a better than linear search here, a trie would
  // be ideal.
  for (size_t i = 0; i < arraysize(kDataResources); ++i) {
    if (!strcmp(name, kDataResources[i].name)) {
      base::StringPiece resource = GetContentClient()->GetDataResource(
          kDataResources[i].id, kDataResources[i].scale_factor);
      return WebData(resource.data(), resource.size());
    }
  }

  NOTREACHED() << "Unknown image resource " << name;
  return WebData();
}

WebString BlinkPlatformImpl::queryLocalizedString(
    WebLocalizedString::Name name) {
  int message_id = ToMessageID(name);
  if (message_id < 0)
    return WebString();
  return GetContentClient()->GetLocalizedString(message_id);
}

WebString BlinkPlatformImpl::queryLocalizedString(
    WebLocalizedString::Name name, int numeric_value) {
  return queryLocalizedString(name, base::IntToString16(numeric_value));
}

WebString BlinkPlatformImpl::queryLocalizedString(
    WebLocalizedString::Name name, const WebString& value) {
  int message_id = ToMessageID(name);
  if (message_id < 0)
    return WebString();
  return ReplaceStringPlaceholders(GetContentClient()->GetLocalizedString(
      message_id), value, NULL);
}

WebString BlinkPlatformImpl::queryLocalizedString(
    WebLocalizedString::Name name,
    const WebString& value1,
    const WebString& value2) {
  int message_id = ToMessageID(name);
  if (message_id < 0)
    return WebString();
  std::vector<base::string16> values;
  values.reserve(2);
  values.push_back(value1);
  values.push_back(value2);
  return ReplaceStringPlaceholders(
      GetContentClient()->GetLocalizedString(message_id), values, NULL);
}

double BlinkPlatformImpl::currentTime() {
  return base::Time::Now().ToDoubleT();
}

double BlinkPlatformImpl::monotonicallyIncreasingTime() {
  return base::TimeTicks::Now().ToInternalValue() /
      static_cast<double>(base::Time::kMicrosecondsPerSecond);
}

void BlinkPlatformImpl::cryptographicallyRandomValues(
    unsigned char* buffer, size_t length) {
  base::RandBytes(buffer, length);
}

void BlinkPlatformImpl::setSharedTimerFiredFunction(void (*func)()) {
  shared_timer_func_ = func;
}

void BlinkPlatformImpl::setSharedTimerFireInterval(
    double interval_seconds) {
  shared_timer_fire_time_ = interval_seconds + monotonicallyIncreasingTime();
  if (shared_timer_suspended_) {
    shared_timer_fire_time_was_set_while_suspended_ = true;
    return;
  }

  // By converting between double and int64 representation, we run the risk
  // of losing precision due to rounding errors. Performing computations in
  // microseconds reduces this risk somewhat. But there still is the potential
  // of us computing a fire time for the timer that is shorter than what we
  // need.
  // As the event loop will check event deadlines prior to actually firing
  // them, there is a risk of needlessly rescheduling events and of
  // needlessly looping if sleep times are too short even by small amounts.
  // This results in measurable performance degradation unless we use ceil() to
  // always round up the sleep times.
  int64 interval = static_cast<int64>(
      ceil(interval_seconds * base::Time::kMillisecondsPerSecond)
      * base::Time::kMicrosecondsPerMillisecond);

  if (interval < 0)
    interval = 0;

  shared_timer_.Stop();
  shared_timer_.Start(FROM_HERE, base::TimeDelta::FromMicroseconds(interval),
                      this, &BlinkPlatformImpl::DoTimeout);
  OnStartSharedTimer(base::TimeDelta::FromMicroseconds(interval));
}

void BlinkPlatformImpl::stopSharedTimer() {
  shared_timer_.Stop();
}

void BlinkPlatformImpl::callOnMainThread(
    void (*func)(void*), void* context) {
  main_loop_->PostTask(FROM_HERE, base::Bind(func, context));
}

blink::WebGestureCurve* BlinkPlatformImpl::createFlingAnimationCurve(
    int device_source,
    const blink::WebFloatPoint& velocity,
    const blink::WebSize& cumulative_scroll) {
#if defined(OS_ANDROID)
  return FlingAnimatorImpl::CreateAndroidGestureCurve(
      velocity,
      cumulative_scroll);
#endif

  if (device_source == blink::WebGestureEvent::Touchscreen)
    return fling_curve_configuration_->CreateForTouchScreen(velocity,
                                                            cumulative_scroll);

  return fling_curve_configuration_->CreateForTouchPad(velocity,
                                                       cumulative_scroll);
}

void BlinkPlatformImpl::didStartWorkerRunLoop(
    const blink::WebWorkerRunLoop& runLoop) {
  WorkerTaskRunner* worker_task_runner = WorkerTaskRunner::Instance();
  worker_task_runner->OnWorkerRunLoopStarted(runLoop);
}

void BlinkPlatformImpl::didStopWorkerRunLoop(
    const blink::WebWorkerRunLoop& runLoop) {
  WorkerTaskRunner* worker_task_runner = WorkerTaskRunner::Instance();
  worker_task_runner->OnWorkerRunLoopStopped(runLoop);
}

blink::WebCrypto* BlinkPlatformImpl::crypto() {
  if (!web_crypto_)
    web_crypto_.reset(new WebCryptoImpl());
  return web_crypto_.get();
}


WebThemeEngine* BlinkPlatformImpl::themeEngine() {
  return &native_theme_engine_;
}

WebFallbackThemeEngine* BlinkPlatformImpl::fallbackThemeEngine() {
  return &fallback_theme_engine_;
}

base::PlatformFile BlinkPlatformImpl::databaseOpenFile(
    const blink::WebString& vfs_file_name, int desired_flags) {
  return base::kInvalidPlatformFileValue;
}

int BlinkPlatformImpl::databaseDeleteFile(
    const blink::WebString& vfs_file_name, bool sync_dir) {
  return -1;
}

long BlinkPlatformImpl::databaseGetFileAttributes(
    const blink::WebString& vfs_file_name) {
  return 0;
}

long long BlinkPlatformImpl::databaseGetFileSize(
    const blink::WebString& vfs_file_name) {
  return 0;
}

long long BlinkPlatformImpl::databaseGetSpaceAvailableForOrigin(
    const blink::WebString& origin_identifier) {
  return 0;
}

blink::WebString BlinkPlatformImpl::signedPublicKeyAndChallengeString(
    unsigned key_size_index,
    const blink::WebString& challenge,
    const blink::WebURL& url) {
  return blink::WebString("");
}

static scoped_ptr<base::ProcessMetrics> CurrentProcessMetrics() {
  using base::ProcessMetrics;
#if defined(OS_MACOSX)
  return scoped_ptr<ProcessMetrics>(
      // The default port provider is sufficient to get data for the current
      // process.
      ProcessMetrics::CreateProcessMetrics(base::GetCurrentProcessHandle(),
                                           NULL));
#else
  return scoped_ptr<ProcessMetrics>(
      ProcessMetrics::CreateProcessMetrics(base::GetCurrentProcessHandle()));
#endif
}

static size_t getMemoryUsageMB(bool bypass_cache) {
  size_t current_mem_usage = 0;
  MemoryUsageCache* mem_usage_cache_singleton = MemoryUsageCache::GetInstance();
  if (!bypass_cache &&
      mem_usage_cache_singleton->IsCachedValueValid(&current_mem_usage))
    return current_mem_usage;

  current_mem_usage = GetMemoryUsageKB() >> 10;
  mem_usage_cache_singleton->SetMemoryValue(current_mem_usage);
  return current_mem_usage;
}

size_t BlinkPlatformImpl::memoryUsageMB() {
  return getMemoryUsageMB(false);
}

size_t BlinkPlatformImpl::actualMemoryUsageMB() {
  return getMemoryUsageMB(true);
}

size_t BlinkPlatformImpl::physicalMemoryMB() {
  return static_cast<size_t>(base::SysInfo::AmountOfPhysicalMemoryMB());
}

size_t BlinkPlatformImpl::numberOfProcessors() {
  return static_cast<size_t>(base::SysInfo::NumberOfProcessors());
}

void BlinkPlatformImpl::startHeapProfiling(
  const blink::WebString& prefix) {
  // FIXME(morrita): Make this built on windows.
#if !defined(NO_TCMALLOC) && defined(USE_TCMALLOC) && !defined(OS_WIN)
  HeapProfilerStart(prefix.utf8().data());
#endif
}

void BlinkPlatformImpl::stopHeapProfiling() {
#if !defined(NO_TCMALLOC) && defined(USE_TCMALLOC) && !defined(OS_WIN)
  HeapProfilerStop();
#endif
}

void BlinkPlatformImpl::dumpHeapProfiling(
  const blink::WebString& reason) {
#if !defined(NO_TCMALLOC) && defined(USE_TCMALLOC) && !defined(OS_WIN)
  HeapProfilerDump(reason.utf8().data());
#endif
}

WebString BlinkPlatformImpl::getHeapProfile() {
#if !defined(NO_TCMALLOC) && defined(USE_TCMALLOC) && !defined(OS_WIN)
  char* data = GetHeapProfile();
  WebString result = WebString::fromUTF8(std::string(data));
  free(data);
  return result;
#else
  return WebString();
#endif
}

bool BlinkPlatformImpl::processMemorySizesInBytes(
    size_t* private_bytes,
    size_t* shared_bytes) {
  return CurrentProcessMetrics()->GetMemoryBytes(private_bytes, shared_bytes);
}

bool BlinkPlatformImpl::memoryAllocatorWasteInBytes(size_t* size) {
  return base::allocator::GetAllocatorWasteSize(size);
}

blink::WebDiscardableMemory*
BlinkPlatformImpl::allocateAndLockDiscardableMemory(size_t bytes) {
  base::DiscardableMemoryType type =
      base::DiscardableMemory::GetPreferredType();
  if (type == base::DISCARDABLE_MEMORY_TYPE_EMULATED)
    return NULL;
  return content::WebDiscardableMemoryImpl::CreateLockedMemory(bytes).release();
}

size_t BlinkPlatformImpl::maxDecodedImageBytes() {
#if defined(OS_ANDROID)
  if (base::android::SysUtils::IsLowEndDevice()) {
    // Limit image decoded size to 3M pixels on low end devices.
    // 4 is maximum number of bytes per pixel.
    return 3 * 1024 * 1024 * 4;
  }
  // For other devices, limit decoded image size based on the amount of physical
  // memory.
  // In some cases all physical memory is not accessible by Chromium, as it can
  // be reserved for direct use by certain hardware. Thus, we set the limit so
  // that 1.6GB of reported physical memory on a 2GB device is enough to set the
  // limit at 16M pixels, which is a desirable value since 4K*4K is a relatively
  // common texture size.
  return base::SysInfo::AmountOfPhysicalMemory() / 25;
#else
  return noDecodedImageByteLimit;
#endif
}

void BlinkPlatformImpl::SetFlingCurveParameters(
    const std::vector<float>& new_touchpad,
    const std::vector<float>& new_touchscreen) {
  fling_curve_configuration_->SetCurveParameters(new_touchpad, new_touchscreen);
}

void BlinkPlatformImpl::SuspendSharedTimer() {
  ++shared_timer_suspended_;
}

void BlinkPlatformImpl::ResumeSharedTimer() {
  DCHECK_GT(shared_timer_suspended_, 0);

  // The shared timer may have fired or been adjusted while we were suspended.
  if (--shared_timer_suspended_ == 0 &&
      (!shared_timer_.IsRunning() ||
       shared_timer_fire_time_was_set_while_suspended_)) {
    shared_timer_fire_time_was_set_while_suspended_ = false;
    setSharedTimerFireInterval(
        shared_timer_fire_time_ - monotonicallyIncreasingTime());
  }
}

// static
void BlinkPlatformImpl::DestroyCurrentThread(void* thread) {
  WebThreadImplForMessageLoop* impl =
      static_cast<WebThreadImplForMessageLoop*>(thread);
  delete impl;
}

}  // namespace content
/* [<][>][^][v][top][bottom][index][help] */
root/content/child/blink_platform_impl.cc

DEFINITIONS
