content/child/blink_platform_impl.cc

   1 // Copyright 2014 The Chromium Authors. All rights reserved.
   2 // Use of this source code is governed by a BSD-style license that can be
   3 // found in the LICENSE file.
   4
   5 #include "content/child/blink_platform_impl.h"
   6
   7 #include <math.h>
   8
   9 #include <vector>
  10
  11 #include "base/allocator/allocator_extension.h"
  12 #include "base/bind.h"
  13 #include "base/files/file_path.h"
  14 #include "base/memory/scoped_ptr.h"
  15 #include "base/memory/singleton.h"
  16 #include "base/message_loop/message_loop.h"
  17 #include "base/metrics/histogram.h"
  18 #include "base/metrics/sparse_histogram.h"
  19 #include "base/metrics/stats_counters.h"
  20 #include "base/process/process_metrics.h"
  21 #include "base/rand_util.h"
  22 #include "base/strings/string_number_conversions.h"
  23 #include "base/strings/string_util.h"
  24 #include "base/strings/utf_string_conversions.h"
  25 #include "base/synchronization/lock.h"
  26 #include "base/synchronization/waitable_event.h"
  27 #include "base/sys_info.h"
  28 #include "base/time/time.h"
  29 #include "content/child/content_child_helpers.h"
  30 #include "content/child/fling_curve_configuration.h"
  31 #include "content/child/web_discardable_memory_impl.h"
  32 #include "content/child/web_socket_stream_handle_impl.h"
  33 #include "content/child/web_url_loader_impl.h"
  34 #include "content/child/websocket_bridge.h"
  35 #include "content/child/webthread_impl.h"
  36 #include "content/child/worker_task_runner.h"
  37 #include "content/public/common/content_client.h"
  38 #include "grit/blink_resources.h"
  39 #include "grit/webkit_resources.h"
  40 #include "grit/webkit_strings.h"
  41 #include "net/base/data_url.h"
  42 #include "net/base/mime_util.h"
  43 #include "net/base/net_errors.h"
  44 #include "third_party/WebKit/public/platform/WebConvertableToTraceFormat.h"
  45 #include "third_party/WebKit/public/platform/WebData.h"
  46 #include "third_party/WebKit/public/platform/WebString.h"
  47 #include "third_party/WebKit/public/platform/WebWaitableEvent.h"
  48 #include "ui/base/layout.h"
  49
  50 #if defined(OS_ANDROID)
  51 #include "base/android/sys_utils.h"
  52 #include "content/child/fling_animator_impl_android.h"
  53 #endif
  54
  55 #if !defined(NO_TCMALLOC) && defined(USE_TCMALLOC) && !defined(OS_WIN)
  56 #include "third_party/tcmalloc/chromium/src/gperftools/heap-profiler.h"
  57 #endif
  58
  59 using blink::WebData;
  60 using blink::WebFallbackThemeEngine;
  61 using blink::WebLocalizedString;
  62 using blink::WebString;
  63 using blink::WebSocketStreamHandle;
  64 using blink::WebThemeEngine;
  65 using blink::WebURL;
  66 using blink::WebURLError;
  67 using blink::WebURLLoader;
  68
  69 namespace content {
  70
  71 namespace {
  72
  73 class WebWaitableEventImpl : public blink::WebWaitableEvent {
  74  public:
  75   WebWaitableEventImpl() : impl_(new base::WaitableEvent(false, false)) {}
  76   virtual ~WebWaitableEventImpl() {}
  77
  78   virtual void wait() { impl_->Wait(); }
  79   virtual void signal() { impl_->Signal(); }
  80
  81   base::WaitableEvent* impl() {
  82     return impl_.get();
  83   }
  84
  85  private:
  86   scoped_ptr<base::WaitableEvent> impl_;
  87   DISALLOW_COPY_AND_ASSIGN(WebWaitableEventImpl);
  88 };
  89
  90 // A simple class to cache the memory usage for a given amount of time.
  91 class MemoryUsageCache {
  92  public:
  93   // Retrieves the Singleton.
  94   static MemoryUsageCache* GetInstance() {
  95     return Singleton<MemoryUsageCache>::get();
  96   }
  97
  98   MemoryUsageCache() : memory_value_(0) { Init(); }
  99   ~MemoryUsageCache() {}
 100
 101   void Init() {
 102     const unsigned int kCacheSeconds = 1;
 103     cache_valid_time_ = base::TimeDelta::FromSeconds(kCacheSeconds);
 104   }
 105
 106   // Returns true if the cached value is fresh.
 107   // Returns false if the cached value is stale, or if |cached_value| is NULL.
 108   bool IsCachedValueValid(size_t* cached_value) {
 109     base::AutoLock scoped_lock(lock_);
 110     if (!cached_value)
 111       return false;
 112     if (base::Time::Now() - last_updated_time_ > cache_valid_time_)
 113       return false;
 114     *cached_value = memory_value_;
 115     return true;
 116   };
 117
 118   // Setter for |memory_value_|, refreshes |last_updated_time_|.
 119   void SetMemoryValue(const size_t value) {
 120     base::AutoLock scoped_lock(lock_);
 121     memory_value_ = value;
 122     last_updated_time_ = base::Time::Now();
 123   }
 124
 125  private:
 126   // The cached memory value.
 127   size_t memory_value_;
 128
 129   // How long the cached value should remain valid.
 130   base::TimeDelta cache_valid_time_;
 131
 132   // The last time the cached value was updated.
 133   base::Time last_updated_time_;
 134
 135   base::Lock lock_;
 136 };
 137
 138 class ConvertableToTraceFormatWrapper
 139     : public base::debug::ConvertableToTraceFormat {
 140  public:
 141   explicit ConvertableToTraceFormatWrapper(
 142       const blink::WebConvertableToTraceFormat& convertable)
 143       : convertable_(convertable) {}
 144   virtual void AppendAsTraceFormat(std::string* out) const OVERRIDE {
 145     *out += convertable_.asTraceFormat().utf8();
 146   }
 147
 148  private:
 149   virtual ~ConvertableToTraceFormatWrapper() {}
 150
 151   blink::WebConvertableToTraceFormat convertable_;
 152 };
 153
 154 }  // namespace
 155
 156 static int ToMessageID(WebLocalizedString::Name name) {
 157   switch (name) {
 158     case WebLocalizedString::AXAMPMFieldText:
 159       return IDS_AX_AM_PM_FIELD_TEXT;
 160     case WebLocalizedString::AXButtonActionVerb:
 161       return IDS_AX_BUTTON_ACTION_VERB;
 162     case WebLocalizedString::AXCheckedCheckBoxActionVerb:
 163       return IDS_AX_CHECKED_CHECK_BOX_ACTION_VERB;
 164     case WebLocalizedString::AXDateTimeFieldEmptyValueText:
 165       return IDS_AX_DATE_TIME_FIELD_EMPTY_VALUE_TEXT;
 166     case WebLocalizedString::AXDayOfMonthFieldText:
 167       return IDS_AX_DAY_OF_MONTH_FIELD_TEXT;
 168     case WebLocalizedString::AXHeadingText:
 169       return IDS_AX_ROLE_HEADING;
 170     case WebLocalizedString::AXHourFieldText:
 171       return IDS_AX_HOUR_FIELD_TEXT;
 172     case WebLocalizedString::AXImageMapText:
 173       return IDS_AX_ROLE_IMAGE_MAP;
 174     case WebLocalizedString::AXLinkActionVerb:
 175       return IDS_AX_LINK_ACTION_VERB;
 176     case WebLocalizedString::AXLinkText:
 177       return IDS_AX_ROLE_LINK;
 178     case WebLocalizedString::AXListMarkerText:
 179       return IDS_AX_ROLE_LIST_MARKER;
 180     case WebLocalizedString::AXMediaDefault:
 181       return IDS_AX_MEDIA_DEFAULT;
 182     case WebLocalizedString::AXMediaAudioElement:
 183       return IDS_AX_MEDIA_AUDIO_ELEMENT;
 184     case WebLocalizedString::AXMediaVideoElement:
 185       return IDS_AX_MEDIA_VIDEO_ELEMENT;
 186     case WebLocalizedString::AXMediaMuteButton:
 187       return IDS_AX_MEDIA_MUTE_BUTTON;
 188     case WebLocalizedString::AXMediaUnMuteButton:
 189       return IDS_AX_MEDIA_UNMUTE_BUTTON;
 190     case WebLocalizedString::AXMediaPlayButton:
 191       return IDS_AX_MEDIA_PLAY_BUTTON;
 192     case WebLocalizedString::AXMediaPauseButton:
 193       return IDS_AX_MEDIA_PAUSE_BUTTON;
 194     case WebLocalizedString::AXMediaSlider:
 195       return IDS_AX_MEDIA_SLIDER;
 196     case WebLocalizedString::AXMediaSliderThumb:
 197       return IDS_AX_MEDIA_SLIDER_THUMB;
 198     case WebLocalizedString::AXMediaCurrentTimeDisplay:
 199       return IDS_AX_MEDIA_CURRENT_TIME_DISPLAY;
 200     case WebLocalizedString::AXMediaTimeRemainingDisplay:
 201       return IDS_AX_MEDIA_TIME_REMAINING_DISPLAY;
 202     case WebLocalizedString::AXMediaStatusDisplay:
 203       return IDS_AX_MEDIA_STATUS_DISPLAY;
 204     case WebLocalizedString::AXMediaEnterFullscreenButton:
 205       return IDS_AX_MEDIA_ENTER_FULL_SCREEN_BUTTON;
 206     case WebLocalizedString::AXMediaExitFullscreenButton:
 207       return IDS_AX_MEDIA_EXIT_FULL_SCREEN_BUTTON;
 208     case WebLocalizedString::AXMediaShowClosedCaptionsButton:
 209       return IDS_AX_MEDIA_SHOW_CLOSED_CAPTIONS_BUTTON;
 210     case WebLocalizedString::AXMediaHideClosedCaptionsButton:
 211       return IDS_AX_MEDIA_HIDE_CLOSED_CAPTIONS_BUTTON;
 212     case WebLocalizedString::AXMediaAudioElementHelp:
 213       return IDS_AX_MEDIA_AUDIO_ELEMENT_HELP;
 214     case WebLocalizedString::AXMediaVideoElementHelp:
 215       return IDS_AX_MEDIA_VIDEO_ELEMENT_HELP;
 216     case WebLocalizedString::AXMediaMuteButtonHelp:
 217       return IDS_AX_MEDIA_MUTE_BUTTON_HELP;
 218     case WebLocalizedString::AXMediaUnMuteButtonHelp:
 219       return IDS_AX_MEDIA_UNMUTE_BUTTON_HELP;
 220     case WebLocalizedString::AXMediaPlayButtonHelp:
 221       return IDS_AX_MEDIA_PLAY_BUTTON_HELP;
 222     case WebLocalizedString::AXMediaPauseButtonHelp:
 223       return IDS_AX_MEDIA_PAUSE_BUTTON_HELP;
 224     case WebLocalizedString::AXMediaSliderHelp:
 225       return IDS_AX_MEDIA_SLIDER_HELP;
 226     case WebLocalizedString::AXMediaSliderThumbHelp:
 227       return IDS_AX_MEDIA_SLIDER_THUMB_HELP;
 228     case WebLocalizedString::AXMediaCurrentTimeDisplayHelp:
 229       return IDS_AX_MEDIA_CURRENT_TIME_DISPLAY_HELP;
 230     case WebLocalizedString::AXMediaTimeRemainingDisplayHelp:
 231       return IDS_AX_MEDIA_TIME_REMAINING_DISPLAY_HELP;
 232     case WebLocalizedString::AXMediaStatusDisplayHelp:
 233       return IDS_AX_MEDIA_STATUS_DISPLAY_HELP;
 234     case WebLocalizedString::AXMediaEnterFullscreenButtonHelp:
 235       return IDS_AX_MEDIA_ENTER_FULL_SCREEN_BUTTON_HELP;
 236     case WebLocalizedString::AXMediaExitFullscreenButtonHelp:
 237       return IDS_AX_MEDIA_EXIT_FULL_SCREEN_BUTTON_HELP;
 238     case WebLocalizedString::AXMediaShowClosedCaptionsButtonHelp:
 239       return IDS_AX_MEDIA_SHOW_CLOSED_CAPTIONS_BUTTON_HELP;
 240     case WebLocalizedString::AXMediaHideClosedCaptionsButtonHelp:
 241       return IDS_AX_MEDIA_HIDE_CLOSED_CAPTIONS_BUTTON_HELP;
 242     case WebLocalizedString::AXMillisecondFieldText:
 243       return IDS_AX_MILLISECOND_FIELD_TEXT;
 244     case WebLocalizedString::AXMinuteFieldText:
 245       return IDS_AX_MINUTE_FIELD_TEXT;
 246     case WebLocalizedString::AXMonthFieldText:
 247       return IDS_AX_MONTH_FIELD_TEXT;
 248     case WebLocalizedString::AXRadioButtonActionVerb:
 249       return IDS_AX_RADIO_BUTTON_ACTION_VERB;
 250     case WebLocalizedString::AXSecondFieldText:
 251       return IDS_AX_SECOND_FIELD_TEXT;
 252     case WebLocalizedString::AXTextFieldActionVerb:
 253       return IDS_AX_TEXT_FIELD_ACTION_VERB;
 254     case WebLocalizedString::AXUncheckedCheckBoxActionVerb:
 255       return IDS_AX_UNCHECKED_CHECK_BOX_ACTION_VERB;
 256     case WebLocalizedString::AXWebAreaText:
 257       return IDS_AX_ROLE_WEB_AREA;
 258     case WebLocalizedString::AXWeekOfYearFieldText:
 259       return IDS_AX_WEEK_OF_YEAR_FIELD_TEXT;
 260     case WebLocalizedString::AXYearFieldText:
 261       return IDS_AX_YEAR_FIELD_TEXT;
 262     case WebLocalizedString::CalendarClear:
 263       return IDS_FORM_CALENDAR_CLEAR;
 264     case WebLocalizedString::CalendarToday:
 265       return IDS_FORM_CALENDAR_TODAY;
 266     case WebLocalizedString::DateFormatDayInMonthLabel:
 267       return IDS_FORM_DATE_FORMAT_DAY_IN_MONTH;
 268     case WebLocalizedString::DateFormatMonthLabel:
 269       return IDS_FORM_DATE_FORMAT_MONTH;
 270     case WebLocalizedString::DateFormatYearLabel:
 271       return IDS_FORM_DATE_FORMAT_YEAR;
 272     case WebLocalizedString::DetailsLabel:
 273       return IDS_DETAILS_WITHOUT_SUMMARY_LABEL;
 274     case WebLocalizedString::FileButtonChooseFileLabel:
 275       return IDS_FORM_FILE_BUTTON_LABEL;
 276     case WebLocalizedString::FileButtonChooseMultipleFilesLabel:
 277       return IDS_FORM_MULTIPLE_FILES_BUTTON_LABEL;
 278     case WebLocalizedString::FileButtonNoFileSelectedLabel:
 279       return IDS_FORM_FILE_NO_FILE_LABEL;
 280     case WebLocalizedString::InputElementAltText:
 281       return IDS_FORM_INPUT_ALT;
 282     case WebLocalizedString::KeygenMenuHighGradeKeySize:
 283       return IDS_KEYGEN_HIGH_GRADE_KEY;
 284     case WebLocalizedString::KeygenMenuMediumGradeKeySize:
 285       return IDS_KEYGEN_MED_GRADE_KEY;
 286     case WebLocalizedString::MissingPluginText:
 287       return IDS_PLUGIN_INITIALIZATION_ERROR;
 288     case WebLocalizedString::MultipleFileUploadText:
 289       return IDS_FORM_FILE_MULTIPLE_UPLOAD;
 290     case WebLocalizedString::OtherColorLabel:
 291       return IDS_FORM_OTHER_COLOR_LABEL;
 292     case WebLocalizedString::OtherDateLabel:
 293         return IDS_FORM_OTHER_DATE_LABEL;
 294     case WebLocalizedString::OtherMonthLabel:
 295       return IDS_FORM_OTHER_MONTH_LABEL;
 296     case WebLocalizedString::OtherTimeLabel:
 297       return IDS_FORM_OTHER_TIME_LABEL;
 298     case WebLocalizedString::OtherWeekLabel:
 299       return IDS_FORM_OTHER_WEEK_LABEL;
 300     case WebLocalizedString::PlaceholderForDayOfMonthField:
 301       return IDS_FORM_PLACEHOLDER_FOR_DAY_OF_MONTH_FIELD;
 302     case WebLocalizedString::PlaceholderForMonthField:
 303       return IDS_FORM_PLACEHOLDER_FOR_MONTH_FIELD;
 304     case WebLocalizedString::PlaceholderForYearField:
 305       return IDS_FORM_PLACEHOLDER_FOR_YEAR_FIELD;
 306     case WebLocalizedString::ResetButtonDefaultLabel:
 307       return IDS_FORM_RESET_LABEL;
 308     case WebLocalizedString::SearchableIndexIntroduction:
 309       return IDS_SEARCHABLE_INDEX_INTRO;
 310     case WebLocalizedString::SearchMenuClearRecentSearchesText:
 311       return IDS_RECENT_SEARCHES_CLEAR;
 312     case WebLocalizedString::SearchMenuNoRecentSearchesText:
 313       return IDS_RECENT_SEARCHES_NONE;
 314     case WebLocalizedString::SearchMenuRecentSearchesText:
 315       return IDS_RECENT_SEARCHES;
 316     case WebLocalizedString::SelectMenuListText:
 317       return IDS_FORM_SELECT_MENU_LIST_TEXT;
 318     case WebLocalizedString::SubmitButtonDefaultLabel:
 319       return IDS_FORM_SUBMIT_LABEL;
 320     case WebLocalizedString::ThisMonthButtonLabel:
 321       return IDS_FORM_THIS_MONTH_LABEL;
 322     case WebLocalizedString::ThisWeekButtonLabel:
 323       return IDS_FORM_THIS_WEEK_LABEL;
 324     case WebLocalizedString::ValidationBadInputForDateTime:
 325       return IDS_FORM_VALIDATION_BAD_INPUT_DATETIME;
 326     case WebLocalizedString::ValidationBadInputForNumber:
 327       return IDS_FORM_VALIDATION_BAD_INPUT_NUMBER;
 328     case WebLocalizedString::ValidationPatternMismatch:
 329       return IDS_FORM_VALIDATION_PATTERN_MISMATCH;
 330     case WebLocalizedString::ValidationRangeOverflow:
 331       return IDS_FORM_VALIDATION_RANGE_OVERFLOW;
 332     case WebLocalizedString::ValidationRangeOverflowDateTime:
 333       return IDS_FORM_VALIDATION_RANGE_OVERFLOW_DATETIME;
 334     case WebLocalizedString::ValidationRangeUnderflow:
 335       return IDS_FORM_VALIDATION_RANGE_UNDERFLOW;
 336     case WebLocalizedString::ValidationRangeUnderflowDateTime:
 337       return IDS_FORM_VALIDATION_RANGE_UNDERFLOW_DATETIME;
 338     case WebLocalizedString::ValidationStepMismatch:
 339       return IDS_FORM_VALIDATION_STEP_MISMATCH;
 340     case WebLocalizedString::ValidationStepMismatchCloseToLimit:
 341       return IDS_FORM_VALIDATION_STEP_MISMATCH_CLOSE_TO_LIMIT;
 342     case WebLocalizedString::ValidationTooLong:
 343       return IDS_FORM_VALIDATION_TOO_LONG;
 344     case WebLocalizedString::ValidationTypeMismatch:
 345       return IDS_FORM_VALIDATION_TYPE_MISMATCH;
 346     case WebLocalizedString::ValidationTypeMismatchForEmail:
 347       return IDS_FORM_VALIDATION_TYPE_MISMATCH_EMAIL;
 348     case WebLocalizedString::ValidationTypeMismatchForEmailEmpty:
 349       return IDS_FORM_VALIDATION_TYPE_MISMATCH_EMAIL_EMPTY;
 350     case WebLocalizedString::ValidationTypeMismatchForEmailEmptyDomain:
 351       return IDS_FORM_VALIDATION_TYPE_MISMATCH_EMAIL_EMPTY_DOMAIN;
 352     case WebLocalizedString::ValidationTypeMismatchForEmailEmptyLocal:
 353       return IDS_FORM_VALIDATION_TYPE_MISMATCH_EMAIL_EMPTY_LOCAL;
 354     case WebLocalizedString::ValidationTypeMismatchForEmailInvalidDomain:
 355       return IDS_FORM_VALIDATION_TYPE_MISMATCH_EMAIL_INVALID_DOMAIN;
 356     case WebLocalizedString::ValidationTypeMismatchForEmailInvalidDots:
 357       return IDS_FORM_VALIDATION_TYPE_MISMATCH_EMAIL_INVALID_DOTS;
 358     case WebLocalizedString::ValidationTypeMismatchForEmailInvalidLocal:
 359       return IDS_FORM_VALIDATION_TYPE_MISMATCH_EMAIL_INVALID_LOCAL;
 360     case WebLocalizedString::ValidationTypeMismatchForEmailNoAtSign:
 361       return IDS_FORM_VALIDATION_TYPE_MISMATCH_EMAIL_NO_AT_SIGN;
 362     case WebLocalizedString::ValidationTypeMismatchForMultipleEmail:
 363       return IDS_FORM_VALIDATION_TYPE_MISMATCH_MULTIPLE_EMAIL;
 364     case WebLocalizedString::ValidationTypeMismatchForURL:
 365       return IDS_FORM_VALIDATION_TYPE_MISMATCH_URL;
 366     case WebLocalizedString::ValidationValueMissing:
 367       return IDS_FORM_VALIDATION_VALUE_MISSING;
 368     case WebLocalizedString::ValidationValueMissingForCheckbox:
 369       return IDS_FORM_VALIDATION_VALUE_MISSING_CHECKBOX;
 370     case WebLocalizedString::ValidationValueMissingForFile:
 371       return IDS_FORM_VALIDATION_VALUE_MISSING_FILE;
 372     case WebLocalizedString::ValidationValueMissingForMultipleFile:
 373       return IDS_FORM_VALIDATION_VALUE_MISSING_MULTIPLE_FILE;
 374     case WebLocalizedString::ValidationValueMissingForRadio:
 375       return IDS_FORM_VALIDATION_VALUE_MISSING_RADIO;
 376     case WebLocalizedString::ValidationValueMissingForSelect:
 377       return IDS_FORM_VALIDATION_VALUE_MISSING_SELECT;
 378     case WebLocalizedString::WeekFormatTemplate:
 379       return IDS_FORM_INPUT_WEEK_TEMPLATE;
 380     case WebLocalizedString::WeekNumberLabel:
 381       return IDS_FORM_WEEK_NUMBER_LABEL;
 382     // This "default:" line exists to avoid compile warnings about enum
 383     // coverage when we add a new symbol to WebLocalizedString.h in WebKit.
 384     // After a planned WebKit patch is landed, we need to add a case statement
 385     // for the added symbol here.
 386     default:
 387       break;
 388   }
 389   return -1;
 390 }
 391
 392 BlinkPlatformImpl::BlinkPlatformImpl()
 393     : main_loop_(base::MessageLoop::current()),
 394       shared_timer_func_(NULL),
 395       shared_timer_fire_time_(0.0),
 396       shared_timer_fire_time_was_set_while_suspended_(false),
 397       shared_timer_suspended_(0),
 398       fling_curve_configuration_(new FlingCurveConfiguration),
 399       current_thread_slot_(&DestroyCurrentThread) {}
 400
 401 BlinkPlatformImpl::~BlinkPlatformImpl() {
 402 }
 403
 404 WebURLLoader* BlinkPlatformImpl::createURLLoader() {
 405   return new WebURLLoaderImpl;
 406 }
 407
 408 WebSocketStreamHandle* BlinkPlatformImpl::createSocketStreamHandle() {
 409   return new WebSocketStreamHandleImpl;
 410 }
 411
 412 blink::WebSocketHandle* BlinkPlatformImpl::createWebSocketHandle() {
 413   return new WebSocketBridge;
 414 }
 415
 416 WebString BlinkPlatformImpl::userAgent() {
 417   return WebString::fromUTF8(GetContentClient()->GetUserAgent());
 418 }
 419
 420 WebData BlinkPlatformImpl::parseDataURL(const WebURL& url,
 421                                         WebString& mimetype_out,
 422                                         WebString& charset_out) {
 423   std::string mime_type, char_set, data;
 424   if (net::DataURL::Parse(url, &mime_type, &char_set, &data)
 425       && net::IsSupportedMimeType(mime_type)) {
 426     mimetype_out = WebString::fromUTF8(mime_type);
 427     charset_out = WebString::fromUTF8(char_set);
 428     return data;
 429   }
 430   return WebData();
 431 }
 432
 433 WebURLError BlinkPlatformImpl::cancelledError(
 434     const WebURL& unreachableURL) const {
 435   return WebURLLoaderImpl::CreateError(unreachableURL, false, net::ERR_ABORTED);
 436 }
 437
 438 blink::WebThread* BlinkPlatformImpl::createThread(const char* name) {
 439   return new WebThreadImpl(name);
 440 }
 441
 442 blink::WebThread* BlinkPlatformImpl::currentThread() {
 443   WebThreadImplForMessageLoop* thread =
 444       static_cast<WebThreadImplForMessageLoop*>(current_thread_slot_.Get());
 445   if (thread)
 446     return (thread);
 447
 448   scoped_refptr<base::MessageLoopProxy> message_loop =
 449       base::MessageLoopProxy::current();
 450   if (!message_loop.get())
 451     return NULL;
 452
 453   thread = new WebThreadImplForMessageLoop(message_loop.get());
 454   current_thread_slot_.Set(thread);
 455   return thread;
 456 }
 457
 458 blink::WebWaitableEvent* BlinkPlatformImpl::createWaitableEvent() {
 459   return new WebWaitableEventImpl();
 460 }
 461
 462 blink::WebWaitableEvent* BlinkPlatformImpl::waitMultipleEvents(
 463     const blink::WebVector<blink::WebWaitableEvent*>& web_events) {
 464   std::vector<base::WaitableEvent*> events;
 465   for (size_t i = 0; i < web_events.size(); ++i)
 466     events.push_back(static_cast<WebWaitableEventImpl*>(web_events[i])->impl());
 467   size_t idx = base::WaitableEvent::WaitMany(
 468       vector_as_array(&events), events.size());
 469   DCHECK_LT(idx, web_events.size());
 470   return web_events[idx];
 471 }
 472
 473 void BlinkPlatformImpl::decrementStatsCounter(const char* name) {
 474   base::StatsCounter(name).Decrement();
 475 }
 476
 477 void BlinkPlatformImpl::incrementStatsCounter(const char* name) {
 478   base::StatsCounter(name).Increment();
 479 }
 480
 481 void BlinkPlatformImpl::histogramCustomCounts(
 482     const char* name, int sample, int min, int max, int bucket_count) {
 483   // Copied from histogram macro, but without the static variable caching
 484   // the histogram because name is dynamic.
 485   base::HistogramBase* counter =
 486       base::Histogram::FactoryGet(name, min, max, bucket_count,
 487           base::HistogramBase::kUmaTargetedHistogramFlag);
 488   DCHECK_EQ(name, counter->histogram_name());
 489   counter->Add(sample);
 490 }
 491
 492 void BlinkPlatformImpl::histogramEnumeration(
 493     const char* name, int sample, int boundary_value) {
 494   // Copied from histogram macro, but without the static variable caching
 495   // the histogram because name is dynamic.
 496   base::HistogramBase* counter =
 497       base::LinearHistogram::FactoryGet(name, 1, boundary_value,
 498           boundary_value + 1, base::HistogramBase::kUmaTargetedHistogramFlag);
 499   DCHECK_EQ(name, counter->histogram_name());
 500   counter->Add(sample);
 501 }
 502
 503 void BlinkPlatformImpl::histogramSparse(const char* name, int sample) {
 504   // For sparse histograms, we can use the macro, as it does not incorporate a
 505   // static.
 506   UMA_HISTOGRAM_SPARSE_SLOWLY(name, sample);
 507 }
 508
 509 const unsigned char* BlinkPlatformImpl::getTraceCategoryEnabledFlag(
 510     const char* category_group) {
 511   return TRACE_EVENT_API_GET_CATEGORY_GROUP_ENABLED(category_group);
 512 }
 513
 514 long* BlinkPlatformImpl::getTraceSamplingState(
 515     const unsigned thread_bucket) {
 516   switch (thread_bucket) {
 517     case 0:
 518       return reinterpret_cast<long*>(&TRACE_EVENT_API_THREAD_BUCKET(0));
 519     case 1:
 520       return reinterpret_cast<long*>(&TRACE_EVENT_API_THREAD_BUCKET(1));
 521     case 2:
 522       return reinterpret_cast<long*>(&TRACE_EVENT_API_THREAD_BUCKET(2));
 523     default:
 524       NOTREACHED() << "Unknown thread bucket type.";
 525   }
 526   return NULL;
 527 }
 528
 529 COMPILE_ASSERT(
 530     sizeof(blink::Platform::TraceEventHandle) ==
 531         sizeof(base::debug::TraceEventHandle),
 532     TraceEventHandle_types_must_be_same_size);
 533
 534 blink::Platform::TraceEventHandle BlinkPlatformImpl::addTraceEvent(
 535     char phase,
 536     const unsigned char* category_group_enabled,
 537     const char* name,
 538     unsigned long long id,
 539     int num_args,
 540     const char** arg_names,
 541     const unsigned char* arg_types,
 542     const unsigned long long* arg_values,
 543     unsigned char flags) {
 544   base::debug::TraceEventHandle handle = TRACE_EVENT_API_ADD_TRACE_EVENT(
 545       phase, category_group_enabled, name, id,
 546       num_args, arg_names, arg_types, arg_values, NULL, flags);
 547   blink::Platform::TraceEventHandle result;
 548   memcpy(&result, &handle, sizeof(result));
 549   return result;
 550 }
 551
 552 blink::Platform::TraceEventHandle BlinkPlatformImpl::addTraceEvent(
 553     char phase,
 554     const unsigned char* category_group_enabled,
 555     const char* name,
 556     unsigned long long id,
 557     int num_args,
 558     const char** arg_names,
 559     const unsigned char* arg_types,
 560     const unsigned long long* arg_values,
 561     const blink::WebConvertableToTraceFormat* convertable_values,
 562     unsigned char flags) {
 563   scoped_refptr<base::debug::ConvertableToTraceFormat> convertable_wrappers[2];
 564   if (convertable_values) {
 565     size_t size = std::min(static_cast<size_t>(num_args),
 566                            arraysize(convertable_wrappers));
 567     for (size_t i = 0; i < size; ++i) {
 568       if (arg_types[i] == TRACE_VALUE_TYPE_CONVERTABLE) {
 569         convertable_wrappers[i] =
 570             new ConvertableToTraceFormatWrapper(convertable_values[i]);
 571       }
 572     }
 573   }
 574   base::debug::TraceEventHandle handle =
 575       TRACE_EVENT_API_ADD_TRACE_EVENT(phase,
 576                                       category_group_enabled,
 577                                       name,
 578                                       id,
 579                                       num_args,
 580                                       arg_names,
 581                                       arg_types,
 582                                       arg_values,
 583                                       convertable_wrappers,
 584                                       flags);
 585   blink::Platform::TraceEventHandle result;
 586   memcpy(&result, &handle, sizeof(result));
 587   return result;
 588 }
 589
 590 void BlinkPlatformImpl::updateTraceEventDuration(
 591     const unsigned char* category_group_enabled,
 592     const char* name,
 593     TraceEventHandle handle) {
 594   base::debug::TraceEventHandle traceEventHandle;
 595   memcpy(&traceEventHandle, &handle, sizeof(handle));
 596   TRACE_EVENT_API_UPDATE_TRACE_EVENT_DURATION(
 597       category_group_enabled, name, traceEventHandle);
 598 }
 599
 600 namespace {
 601
 602 WebData loadAudioSpatializationResource(const char* name) {
 603 #ifdef IDR_AUDIO_SPATIALIZATION_COMPOSITE
 604   if (!strcmp(name, "Composite")) {
 605     base::StringPiece resource = GetContentClient()->GetDataResource(
 606         IDR_AUDIO_SPATIALIZATION_COMPOSITE, ui::SCALE_FACTOR_NONE);
 607     return WebData(resource.data(), resource.size());
 608   }
 609 #endif
 610
 611 #ifdef IDR_AUDIO_SPATIALIZATION_T000_P000
 612   const size_t kExpectedSpatializationNameLength = 31;
 613   if (strlen(name) != kExpectedSpatializationNameLength) {
 614     return WebData();
 615   }
 616
 617   // Extract the azimuth and elevation from the resource name.
 618   int azimuth = 0;
 619   int elevation = 0;
 620   int values_parsed =
 621       sscanf(name, "IRC_Composite_C_R0195_T%3d_P%3d", &azimuth, &elevation);
 622   if (values_parsed != 2) {
 623     return WebData();
 624   }
 625
 626   // The resource index values go through the elevations first, then azimuths.
 627   const int kAngleSpacing = 15;
 628
 629   // 0 <= elevation <= 90 (or 315 <= elevation <= 345)
 630   // in increments of 15 degrees.
 631   int elevation_index =
 632       elevation <= 90 ? elevation / kAngleSpacing :
 633       7 + (elevation - 315) / kAngleSpacing;
 634   bool is_elevation_index_good = 0 <= elevation_index && elevation_index < 10;
 635
 636   // 0 <= azimuth < 360 in increments of 15 degrees.
 637   int azimuth_index = azimuth / kAngleSpacing;
 638   bool is_azimuth_index_good = 0 <= azimuth_index && azimuth_index < 24;
 639
 640   const int kNumberOfElevations = 10;
 641   const int kNumberOfAudioResources = 240;
 642   int resource_index = kNumberOfElevations * azimuth_index + elevation_index;
 643   bool is_resource_index_good = 0 <= resource_index &&
 644       resource_index < kNumberOfAudioResources;
 645
 646   if (is_azimuth_index_good && is_elevation_index_good &&
 647       is_resource_index_good) {
 648     const int kFirstAudioResourceIndex = IDR_AUDIO_SPATIALIZATION_T000_P000;
 649     base::StringPiece resource = GetContentClient()->GetDataResource(
 650         kFirstAudioResourceIndex + resource_index, ui::SCALE_FACTOR_NONE);
 651     return WebData(resource.data(), resource.size());
 652   }
 653 #endif  // IDR_AUDIO_SPATIALIZATION_T000_P000
 654
 655   NOTREACHED();
 656   return WebData();
 657 }
 658
 659 struct DataResource {
 660   const char* name;
 661   int id;
 662   ui::ScaleFactor scale_factor;
 663 };
 664
 665 const DataResource kDataResources[] = {
 666   { "missingImage", IDR_BROKENIMAGE, ui::SCALE_FACTOR_100P },
 667   { "missingImage@2x", IDR_BROKENIMAGE, ui::SCALE_FACTOR_200P },
 668   { "mediaplayerPause", IDR_MEDIAPLAYER_PAUSE_BUTTON, ui::SCALE_FACTOR_100P },
 669   { "mediaplayerPauseHover",
 670     IDR_MEDIAPLAYER_PAUSE_BUTTON_HOVER, ui::SCALE_FACTOR_100P },
 671   { "mediaplayerPauseDown",
 672     IDR_MEDIAPLAYER_PAUSE_BUTTON_DOWN, ui::SCALE_FACTOR_100P },
 673   { "mediaplayerPlay", IDR_MEDIAPLAYER_PLAY_BUTTON, ui::SCALE_FACTOR_100P },
 674   { "mediaplayerPlayHover",
 675     IDR_MEDIAPLAYER_PLAY_BUTTON_HOVER, ui::SCALE_FACTOR_100P },
 676   { "mediaplayerPlayDown",
 677     IDR_MEDIAPLAYER_PLAY_BUTTON_DOWN, ui::SCALE_FACTOR_100P },
 678   { "mediaplayerPlayDisabled",
 679     IDR_MEDIAPLAYER_PLAY_BUTTON_DISABLED, ui::SCALE_FACTOR_100P },
 680   { "mediaplayerSoundLevel3",
 681     IDR_MEDIAPLAYER_SOUND_LEVEL3_BUTTON, ui::SCALE_FACTOR_100P },
 682   { "mediaplayerSoundLevel3Hover",
 683     IDR_MEDIAPLAYER_SOUND_LEVEL3_BUTTON_HOVER, ui::SCALE_FACTOR_100P },
 684   { "mediaplayerSoundLevel3Down",
 685     IDR_MEDIAPLAYER_SOUND_LEVEL3_BUTTON_DOWN, ui::SCALE_FACTOR_100P },
 686   { "mediaplayerSoundLevel2",
 687     IDR_MEDIAPLAYER_SOUND_LEVEL2_BUTTON, ui::SCALE_FACTOR_100P },
 688   { "mediaplayerSoundLevel2Hover",
 689     IDR_MEDIAPLAYER_SOUND_LEVEL2_BUTTON_HOVER, ui::SCALE_FACTOR_100P },
 690   { "mediaplayerSoundLevel2Down",
 691     IDR_MEDIAPLAYER_SOUND_LEVEL2_BUTTON_DOWN, ui::SCALE_FACTOR_100P },
 692   { "mediaplayerSoundLevel1",
 693     IDR_MEDIAPLAYER_SOUND_LEVEL1_BUTTON, ui::SCALE_FACTOR_100P },
 694   { "mediaplayerSoundLevel1Hover",
 695     IDR_MEDIAPLAYER_SOUND_LEVEL1_BUTTON_HOVER, ui::SCALE_FACTOR_100P },
 696   { "mediaplayerSoundLevel1Down",
 697     IDR_MEDIAPLAYER_SOUND_LEVEL1_BUTTON_DOWN, ui::SCALE_FACTOR_100P },
 698   { "mediaplayerSoundLevel0",
 699     IDR_MEDIAPLAYER_SOUND_LEVEL0_BUTTON, ui::SCALE_FACTOR_100P },
 700   { "mediaplayerSoundLevel0Hover",
 701     IDR_MEDIAPLAYER_SOUND_LEVEL0_BUTTON_HOVER, ui::SCALE_FACTOR_100P },
 702   { "mediaplayerSoundLevel0Down",
 703     IDR_MEDIAPLAYER_SOUND_LEVEL0_BUTTON_DOWN, ui::SCALE_FACTOR_100P },
 704   { "mediaplayerSoundDisabled",
 705     IDR_MEDIAPLAYER_SOUND_DISABLED, ui::SCALE_FACTOR_100P },
 706   { "mediaplayerSliderThumb",
 707     IDR_MEDIAPLAYER_SLIDER_THUMB, ui::SCALE_FACTOR_100P },
 708   { "mediaplayerSliderThumbHover",
 709     IDR_MEDIAPLAYER_SLIDER_THUMB_HOVER, ui::SCALE_FACTOR_100P },
 710   { "mediaplayerSliderThumbDown",
 711     IDR_MEDIAPLAYER_SLIDER_THUMB_DOWN, ui::SCALE_FACTOR_100P },
 712   { "mediaplayerVolumeSliderThumb",
 713     IDR_MEDIAPLAYER_VOLUME_SLIDER_THUMB, ui::SCALE_FACTOR_100P },
 714   { "mediaplayerVolumeSliderThumbHover",
 715     IDR_MEDIAPLAYER_VOLUME_SLIDER_THUMB_HOVER, ui::SCALE_FACTOR_100P },
 716   { "mediaplayerVolumeSliderThumbDown",
 717     IDR_MEDIAPLAYER_VOLUME_SLIDER_THUMB_DOWN, ui::SCALE_FACTOR_100P },
 718   { "mediaplayerVolumeSliderThumbDisabled",
 719     IDR_MEDIAPLAYER_VOLUME_SLIDER_THUMB_DISABLED, ui::SCALE_FACTOR_100P },
 720   { "mediaplayerClosedCaption",
 721     IDR_MEDIAPLAYER_CLOSEDCAPTION_BUTTON, ui::SCALE_FACTOR_100P },
 722   { "mediaplayerClosedCaptionHover",
 723     IDR_MEDIAPLAYER_CLOSEDCAPTION_BUTTON_HOVER, ui::SCALE_FACTOR_100P },
 724   { "mediaplayerClosedCaptionDown",
 725     IDR_MEDIAPLAYER_CLOSEDCAPTION_BUTTON_DOWN, ui::SCALE_FACTOR_100P },
 726   { "mediaplayerClosedCaptionDisabled",
 727     IDR_MEDIAPLAYER_CLOSEDCAPTION_BUTTON_DISABLED, ui::SCALE_FACTOR_100P },
 728   { "mediaplayerFullscreen",
 729     IDR_MEDIAPLAYER_FULLSCREEN_BUTTON, ui::SCALE_FACTOR_100P },
 730   { "mediaplayerFullscreenHover",
 731     IDR_MEDIAPLAYER_FULLSCREEN_BUTTON_HOVER, ui::SCALE_FACTOR_100P },
 732   { "mediaplayerFullscreenDown",
 733     IDR_MEDIAPLAYER_FULLSCREEN_BUTTON_DOWN, ui::SCALE_FACTOR_100P },
 734   { "mediaplayerFullscreenDisabled",
 735     IDR_MEDIAPLAYER_FULLSCREEN_BUTTON_DISABLED, ui::SCALE_FACTOR_100P },
 736   { "mediaplayerOverlayPlay",
 737     IDR_MEDIAPLAYER_OVERLAY_PLAY_BUTTON, ui::SCALE_FACTOR_100P },
 738 #if defined(OS_MACOSX)
 739   { "overhangPattern", IDR_OVERHANG_PATTERN, ui::SCALE_FACTOR_100P },
 740   { "overhangShadow", IDR_OVERHANG_SHADOW, ui::SCALE_FACTOR_100P },
 741 #endif
 742   { "panIcon", IDR_PAN_SCROLL_ICON, ui::SCALE_FACTOR_100P },
 743   { "searchCancel", IDR_SEARCH_CANCEL, ui::SCALE_FACTOR_100P },
 744   { "searchCancelPressed", IDR_SEARCH_CANCEL_PRESSED, ui::SCALE_FACTOR_100P },
 745   { "searchMagnifier", IDR_SEARCH_MAGNIFIER, ui::SCALE_FACTOR_100P },
 746   { "searchMagnifierResults",
 747     IDR_SEARCH_MAGNIFIER_RESULTS, ui::SCALE_FACTOR_100P },
 748   { "textAreaResizeCorner", IDR_TEXTAREA_RESIZER, ui::SCALE_FACTOR_100P },
 749   { "textAreaResizeCorner@2x", IDR_TEXTAREA_RESIZER, ui::SCALE_FACTOR_200P },
 750   { "generatePassword", IDR_PASSWORD_GENERATION_ICON, ui::SCALE_FACTOR_100P },
 751   { "generatePasswordHover",
 752     IDR_PASSWORD_GENERATION_ICON_HOVER, ui::SCALE_FACTOR_100P },
 753 };
 754
 755 }  // namespace
 756
 757 WebData BlinkPlatformImpl::loadResource(const char* name) {
 758   // Some clients will call into this method with an empty |name| when they have
 759   // optional resources.  For example, the PopupMenuChromium code can have icons
 760   // for some Autofill items but not for others.
 761   if (!strlen(name))
 762     return WebData();
 763
 764   // Check the name prefix to see if it's an audio resource.
 765   if (StartsWithASCII(name, "IRC_Composite", true) ||
 766       StartsWithASCII(name, "Composite", true))
 767     return loadAudioSpatializationResource(name);
 768
 769   // TODO(flackr): We should use a better than linear search here, a trie would
 770   // be ideal.
 771   for (size_t i = 0; i < arraysize(kDataResources); ++i) {
 772     if (!strcmp(name, kDataResources[i].name)) {
 773       base::StringPiece resource = GetContentClient()->GetDataResource(
 774           kDataResources[i].id, kDataResources[i].scale_factor);
 775       return WebData(resource.data(), resource.size());
 776     }
 777   }
 778
 779   NOTREACHED() << "Unknown image resource " << name;
 780   return WebData();
 781 }
 782
 783 WebString BlinkPlatformImpl::queryLocalizedString(
 784     WebLocalizedString::Name name) {
 785   int message_id = ToMessageID(name);
 786   if (message_id < 0)
 787     return WebString();
 788   return GetContentClient()->GetLocalizedString(message_id);
 789 }
 790
 791 WebString BlinkPlatformImpl::queryLocalizedString(
 792     WebLocalizedString::Name name, int numeric_value) {
 793   return queryLocalizedString(name, base::IntToString16(numeric_value));
 794 }
 795
 796 WebString BlinkPlatformImpl::queryLocalizedString(
 797     WebLocalizedString::Name name, const WebString& value) {
 798   int message_id = ToMessageID(name);
 799   if (message_id < 0)
 800     return WebString();
 801   return ReplaceStringPlaceholders(GetContentClient()->GetLocalizedString(
 802       message_id), value, NULL);
 803 }
 804
 805 WebString BlinkPlatformImpl::queryLocalizedString(
 806     WebLocalizedString::Name name,
 807     const WebString& value1,
 808     const WebString& value2) {
 809   int message_id = ToMessageID(name);
 810   if (message_id < 0)
 811     return WebString();
 812   std::vector<base::string16> values;
 813   values.reserve(2);
 814   values.push_back(value1);
 815   values.push_back(value2);
 816   return ReplaceStringPlaceholders(
 817       GetContentClient()->GetLocalizedString(message_id), values, NULL);
 818 }
 819
 820 double BlinkPlatformImpl::currentTime() {
 821   return base::Time::Now().ToDoubleT();
 822 }
 823
 824 double BlinkPlatformImpl::monotonicallyIncreasingTime() {
 825   return base::TimeTicks::Now().ToInternalValue() /
 826       static_cast<double>(base::Time::kMicrosecondsPerSecond);
 827 }
 828
 829 void BlinkPlatformImpl::cryptographicallyRandomValues(
 830     unsigned char* buffer, size_t length) {
 831   base::RandBytes(buffer, length);
 832 }
 833
 834 void BlinkPlatformImpl::setSharedTimerFiredFunction(void (*func)()) {
 835   shared_timer_func_ = func;
 836 }
 837
 838 void BlinkPlatformImpl::setSharedTimerFireInterval(
 839     double interval_seconds) {
 840   shared_timer_fire_time_ = interval_seconds + monotonicallyIncreasingTime();
 841   if (shared_timer_suspended_) {
 842     shared_timer_fire_time_was_set_while_suspended_ = true;
 843     return;
 844   }
 845
 846   // By converting between double and int64 representation, we run the risk
 847   // of losing precision due to rounding errors. Performing computations in
 848   // microseconds reduces this risk somewhat. But there still is the potential
 849   // of us computing a fire time for the timer that is shorter than what we
 850   // need.
 851   // As the event loop will check event deadlines prior to actually firing
 852   // them, there is a risk of needlessly rescheduling events and of
 853   // needlessly looping if sleep times are too short even by small amounts.
 854   // This results in measurable performance degradation unless we use ceil() to
 855   // always round up the sleep times.
 856   int64 interval = static_cast<int64>(
 857       ceil(interval_seconds * base::Time::kMillisecondsPerSecond)
 858       * base::Time::kMicrosecondsPerMillisecond);
 859
 860   if (interval < 0)
 861     interval = 0;
 862
 863   shared_timer_.Stop();
 864   shared_timer_.Start(FROM_HERE, base::TimeDelta::FromMicroseconds(interval),
 865                       this, &BlinkPlatformImpl::DoTimeout);
 866   OnStartSharedTimer(base::TimeDelta::FromMicroseconds(interval));
 867 }
 868
 869 void BlinkPlatformImpl::stopSharedTimer() {
 870   shared_timer_.Stop();
 871 }
 872
 873 void BlinkPlatformImpl::callOnMainThread(
 874     void (*func)(void*), void* context) {
 875   main_loop_->PostTask(FROM_HERE, base::Bind(func, context));
 876 }
 877
 878 blink::WebGestureCurve* BlinkPlatformImpl::createFlingAnimationCurve(
 879     blink::WebGestureDevice device_source,
 880     const blink::WebFloatPoint& velocity,
 881     const blink::WebSize& cumulative_scroll) {
 882 #if defined(OS_ANDROID)
 883   return FlingAnimatorImpl::CreateAndroidGestureCurve(
 884       velocity,
 885       cumulative_scroll);
 886 #endif
 887
 888   if (device_source == blink::WebGestureDeviceTouchscreen)
 889     return fling_curve_configuration_->CreateForTouchScreen(velocity,
 890                                                             cumulative_scroll);
 891
 892   return fling_curve_configuration_->CreateForTouchPad(velocity,
 893                                                        cumulative_scroll);
 894 }
 895
 896 void BlinkPlatformImpl::didStartWorkerRunLoop(
 897     const blink::WebWorkerRunLoop& runLoop) {
 898   WorkerTaskRunner* worker_task_runner = WorkerTaskRunner::Instance();
 899   worker_task_runner->OnWorkerRunLoopStarted(runLoop);
 900 }
 901
 902 void BlinkPlatformImpl::didStopWorkerRunLoop(
 903     const blink::WebWorkerRunLoop& runLoop) {
 904   WorkerTaskRunner* worker_task_runner = WorkerTaskRunner::Instance();
 905   worker_task_runner->OnWorkerRunLoopStopped(runLoop);
 906 }
 907
 908 blink::WebCrypto* BlinkPlatformImpl::crypto() {
 909   WebCryptoImpl::EnsureInit();
 910   return &web_crypto_;
 911 }
 912
 913
 914 WebThemeEngine* BlinkPlatformImpl::themeEngine() {
 915   return &native_theme_engine_;
 916 }
 917
 918 WebFallbackThemeEngine* BlinkPlatformImpl::fallbackThemeEngine() {
 919   return &fallback_theme_engine_;
 920 }
 921
 922 blink::Platform::FileHandle BlinkPlatformImpl::databaseOpenFile(
 923     const blink::WebString& vfs_file_name, int desired_flags) {
 924 #if defined(OS_WIN)
 925   return INVALID_HANDLE_VALUE;
 926 #elif defined(OS_POSIX)
 927   return -1;
 928 #endif
 929 }
 930
 931 int BlinkPlatformImpl::databaseDeleteFile(
 932     const blink::WebString& vfs_file_name, bool sync_dir) {
 933   return -1;
 934 }
 935
 936 long BlinkPlatformImpl::databaseGetFileAttributes(
 937     const blink::WebString& vfs_file_name) {
 938   return 0;
 939 }
 940
 941 long long BlinkPlatformImpl::databaseGetFileSize(
 942     const blink::WebString& vfs_file_name) {
 943   return 0;
 944 }
 945
 946 long long BlinkPlatformImpl::databaseGetSpaceAvailableForOrigin(
 947     const blink::WebString& origin_identifier) {
 948   return 0;
 949 }
 950
 951 blink::WebString BlinkPlatformImpl::signedPublicKeyAndChallengeString(
 952     unsigned key_size_index,
 953     const blink::WebString& challenge,
 954     const blink::WebURL& url) {
 955   return blink::WebString("");
 956 }
 957
 958 static scoped_ptr<base::ProcessMetrics> CurrentProcessMetrics() {
 959   using base::ProcessMetrics;
 960 #if defined(OS_MACOSX)
 961   return scoped_ptr<ProcessMetrics>(
 962       // The default port provider is sufficient to get data for the current
 963       // process.
 964       ProcessMetrics::CreateProcessMetrics(base::GetCurrentProcessHandle(),
 965                                            NULL));
 966 #else
 967   return scoped_ptr<ProcessMetrics>(
 968       ProcessMetrics::CreateProcessMetrics(base::GetCurrentProcessHandle()));
 969 #endif
 970 }
 971
 972 static size_t getMemoryUsageMB(bool bypass_cache) {
 973   size_t current_mem_usage = 0;
 974   MemoryUsageCache* mem_usage_cache_singleton = MemoryUsageCache::GetInstance();
 975   if (!bypass_cache &&
 976       mem_usage_cache_singleton->IsCachedValueValid(&current_mem_usage))
 977     return current_mem_usage;
 978
 979   current_mem_usage = GetMemoryUsageKB() >> 10;
 980   mem_usage_cache_singleton->SetMemoryValue(current_mem_usage);
 981   return current_mem_usage;
 982 }
 983
 984 size_t BlinkPlatformImpl::memoryUsageMB() {
 985   return getMemoryUsageMB(false);
 986 }
 987
 988 size_t BlinkPlatformImpl::actualMemoryUsageMB() {
 989   return getMemoryUsageMB(true);
 990 }
 991
 992 size_t BlinkPlatformImpl::physicalMemoryMB() {
 993   return static_cast<size_t>(base::SysInfo::AmountOfPhysicalMemoryMB());
 994 }
 995
 996 size_t BlinkPlatformImpl::virtualMemoryLimitMB() {
 997   return static_cast<size_t>(base::SysInfo::AmountOfVirtualMemoryMB());
 998 }
 999
1000 size_t BlinkPlatformImpl::numberOfProcessors() {
1001   return static_cast<size_t>(base::SysInfo::NumberOfProcessors());
1002 }
1003
1004 void BlinkPlatformImpl::startHeapProfiling(
1005   const blink::WebString& prefix) {
1006   // FIXME(morrita): Make this built on windows.
1007 #if !defined(NO_TCMALLOC) && defined(USE_TCMALLOC) && !defined(OS_WIN)
1008   HeapProfilerStart(prefix.utf8().data());
1009 #endif
1010 }
1011
1012 void BlinkPlatformImpl::stopHeapProfiling() {
1013 #if !defined(NO_TCMALLOC) && defined(USE_TCMALLOC) && !defined(OS_WIN)
1014   HeapProfilerStop();
1015 #endif
1016 }
1017
1018 void BlinkPlatformImpl::dumpHeapProfiling(
1019   const blink::WebString& reason) {
1020 #if !defined(NO_TCMALLOC) && defined(USE_TCMALLOC) && !defined(OS_WIN)
1021   HeapProfilerDump(reason.utf8().data());
1022 #endif
1023 }
1024
1025 WebString BlinkPlatformImpl::getHeapProfile() {
1026 #if !defined(NO_TCMALLOC) && defined(USE_TCMALLOC) && !defined(OS_WIN)
1027   char* data = GetHeapProfile();
1028   WebString result = WebString::fromUTF8(std::string(data));
1029   free(data);
1030   return result;
1031 #else
1032   return WebString();
1033 #endif
1034 }
1035
1036 bool BlinkPlatformImpl::processMemorySizesInBytes(
1037     size_t* private_bytes,
1038     size_t* shared_bytes) {
1039   return CurrentProcessMetrics()->GetMemoryBytes(private_bytes, shared_bytes);
1040 }
1041
1042 bool BlinkPlatformImpl::memoryAllocatorWasteInBytes(size_t* size) {
1043   return base::allocator::GetAllocatorWasteSize(size);
1044 }
1045
1046 blink::WebDiscardableMemory*
1047 BlinkPlatformImpl::allocateAndLockDiscardableMemory(size_t bytes) {
1048   base::DiscardableMemoryType type =
1049       base::DiscardableMemory::GetPreferredType();
1050   if (type == base::DISCARDABLE_MEMORY_TYPE_EMULATED)
1051     return NULL;
1052   return content::WebDiscardableMemoryImpl::CreateLockedMemory(bytes).release();
1053 }
1054
1055 size_t BlinkPlatformImpl::maxDecodedImageBytes() {
1056 #if defined(OS_ANDROID)
1057   if (base::android::SysUtils::IsLowEndDevice()) {
1058     // Limit image decoded size to 3M pixels on low end devices.
1059     // 4 is maximum number of bytes per pixel.
1060     return 3 * 1024 * 1024 * 4;
1061   }
1062   // For other devices, limit decoded image size based on the amount of physical
1063   // memory.
1064   // In some cases all physical memory is not accessible by Chromium, as it can
1065   // be reserved for direct use by certain hardware. Thus, we set the limit so
1066   // that 1.6GB of reported physical memory on a 2GB device is enough to set the
1067   // limit at 16M pixels, which is a desirable value since 4K*4K is a relatively
1068   // common texture size.
1069   return base::SysInfo::AmountOfPhysicalMemory() / 25;
1070 #else
1071   return noDecodedImageByteLimit;
1072 #endif
1073 }
1074
1075 void BlinkPlatformImpl::SetFlingCurveParameters(
1076     const std::vector<float>& new_touchpad,
1077     const std::vector<float>& new_touchscreen) {
1078   fling_curve_configuration_->SetCurveParameters(new_touchpad, new_touchscreen);
1079 }
1080
1081 void BlinkPlatformImpl::SuspendSharedTimer() {
1082   ++shared_timer_suspended_;
1083 }
1084
1085 void BlinkPlatformImpl::ResumeSharedTimer() {
1086   DCHECK_GT(shared_timer_suspended_, 0);
1087
1088   // The shared timer may have fired or been adjusted while we were suspended.
1089   if (--shared_timer_suspended_ == 0 &&
1090       (!shared_timer_.IsRunning() ||
1091        shared_timer_fire_time_was_set_while_suspended_)) {
1092     shared_timer_fire_time_was_set_while_suspended_ = false;
1093     setSharedTimerFireInterval(
1094         shared_timer_fire_time_ - monotonicallyIncreasingTime());
1095   }
1096 }
1097
1098 // static
1099 void BlinkPlatformImpl::DestroyCurrentThread(void* thread) {
1100   WebThreadImplForMessageLoop* impl =
1101       static_cast<WebThreadImplForMessageLoop*>(thread);
1102   delete impl;
1103 }
1104
1105 }  // namespace content