webkit/child/webkitplatformsupport_impl.cc

   1 // Copyright (c) 2012 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 "webkit/child/webkitplatformsupport_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/platform_file.h"
  21 #include "base/process/process_metrics.h"
  22 #include "base/rand_util.h"
  23 #include "base/strings/string_number_conversions.h"
  24 #include "base/strings/string_util.h"
  25 #include "base/strings/utf_string_conversions.h"
  26 #include "base/synchronization/lock.h"
  27 #include "base/time/time.h"
  28 #include "content/public/common/webplugininfo.h"
  29 #include "grit/blink_resources.h"
  30 #include "grit/webkit_resources.h"
  31 #include "grit/webkit_strings.h"
  32 #include "net/base/data_url.h"
  33 #include "net/base/mime_util.h"
  34 #include "net/base/net_errors.h"
  35 #include "third_party/WebKit/public/platform/WebCookie.h"
  36 #include "third_party/WebKit/public/platform/WebData.h"
  37 #include "third_party/WebKit/public/platform/WebDiscardableMemory.h"
  38 #include "third_party/WebKit/public/platform/WebGestureCurve.h"
  39 #include "third_party/WebKit/public/platform/WebPluginListBuilder.h"
  40 #include "third_party/WebKit/public/platform/WebString.h"
  41 #include "third_party/WebKit/public/platform/WebURL.h"
  42 #include "third_party/WebKit/public/platform/WebVector.h"
  43 #include "third_party/WebKit/public/web/WebFrameClient.h"
  44 #include "third_party/WebKit/public/web/WebInputEvent.h"
  45 #include "third_party/WebKit/public/web/WebScreenInfo.h"
  46 #include "third_party/tcmalloc/chromium/src/gperftools/heap-profiler.h"
  47 #include "ui/base/layout.h"
  48 #include "webkit/child/webkit_child_helpers.h"
  49 #include "webkit/child/websocketstreamhandle_impl.h"
  50 #include "webkit/child/weburlloader_impl.h"
  51 #include "webkit/common/user_agent/user_agent.h"
  52 #include "webkit/glue/webkit_glue.h"
  53
  54 using WebKit::WebAudioBus;
  55 using WebKit::WebCookie;
  56 using WebKit::WebData;
  57 using WebKit::WebLocalizedString;
  58 using WebKit::WebPluginListBuilder;
  59 using WebKit::WebString;
  60 using WebKit::WebSocketStreamHandle;
  61 using WebKit::WebURL;
  62 using WebKit::WebURLError;
  63 using WebKit::WebURLLoader;
  64 using WebKit::WebVector;
  65
  66 namespace {
  67
  68 // A simple class to cache the memory usage for a given amount of time.
  69 class MemoryUsageCache {
  70  public:
  71   // Retrieves the Singleton.
  72   static MemoryUsageCache* GetInstance() {
  73     return Singleton<MemoryUsageCache>::get();
  74   }
  75
  76   MemoryUsageCache() : memory_value_(0) { Init(); }
  77   ~MemoryUsageCache() {}
  78
  79   void Init() {
  80     const unsigned int kCacheSeconds = 1;
  81     cache_valid_time_ = base::TimeDelta::FromSeconds(kCacheSeconds);
  82   }
  83
  84   // Returns true if the cached value is fresh.
  85   // Returns false if the cached value is stale, or if |cached_value| is NULL.
  86   bool IsCachedValueValid(size_t* cached_value) {
  87     base::AutoLock scoped_lock(lock_);
  88     if (!cached_value)
  89       return false;
  90     if (base::Time::Now() - last_updated_time_ > cache_valid_time_)
  91       return false;
  92     *cached_value = memory_value_;
  93     return true;
  94   };
  95
  96   // Setter for |memory_value_|, refreshes |last_updated_time_|.
  97   void SetMemoryValue(const size_t value) {
  98     base::AutoLock scoped_lock(lock_);
  99     memory_value_ = value;
 100     last_updated_time_ = base::Time::Now();
 101   }
 102
 103  private:
 104   // The cached memory value.
 105   size_t memory_value_;
 106
 107   // How long the cached value should remain valid.
 108   base::TimeDelta cache_valid_time_;
 109
 110   // The last time the cached value was updated.
 111   base::Time last_updated_time_;
 112
 113   base::Lock lock_;
 114 };
 115
 116 }  // anonymous namespace
 117
 118 namespace webkit_glue {
 119
 120 static int ToMessageID(WebLocalizedString::Name name) {
 121   switch (name) {
 122     case WebLocalizedString::AXAMPMFieldText:
 123       return IDS_AX_AM_PM_FIELD_TEXT;
 124     case WebLocalizedString::AXButtonActionVerb:
 125       return IDS_AX_BUTTON_ACTION_VERB;
 126     case WebLocalizedString::AXCheckedCheckBoxActionVerb:
 127       return IDS_AX_CHECKED_CHECK_BOX_ACTION_VERB;
 128     case WebLocalizedString::AXDateTimeFieldEmptyValueText:
 129       return IDS_AX_DATE_TIME_FIELD_EMPTY_VALUE_TEXT;
 130     case WebLocalizedString::AXDayOfMonthFieldText:
 131       return IDS_AX_DAY_OF_MONTH_FIELD_TEXT;
 132     case WebLocalizedString::AXHeadingText:
 133       return IDS_AX_ROLE_HEADING;
 134     case WebLocalizedString::AXHourFieldText:
 135       return IDS_AX_HOUR_FIELD_TEXT;
 136     case WebLocalizedString::AXImageMapText:
 137       return IDS_AX_ROLE_IMAGE_MAP;
 138     case WebLocalizedString::AXLinkActionVerb:
 139       return IDS_AX_LINK_ACTION_VERB;
 140     case WebLocalizedString::AXLinkText:
 141       return IDS_AX_ROLE_LINK;
 142     case WebLocalizedString::AXListMarkerText:
 143       return IDS_AX_ROLE_LIST_MARKER;
 144     case WebLocalizedString::AXMediaDefault:
 145       return IDS_AX_MEDIA_DEFAULT;
 146     case WebLocalizedString::AXMediaAudioElement:
 147       return IDS_AX_MEDIA_AUDIO_ELEMENT;
 148     case WebLocalizedString::AXMediaVideoElement:
 149       return IDS_AX_MEDIA_VIDEO_ELEMENT;
 150     case WebLocalizedString::AXMediaMuteButton:
 151       return IDS_AX_MEDIA_MUTE_BUTTON;
 152     case WebLocalizedString::AXMediaUnMuteButton:
 153       return IDS_AX_MEDIA_UNMUTE_BUTTON;
 154     case WebLocalizedString::AXMediaPlayButton:
 155       return IDS_AX_MEDIA_PLAY_BUTTON;
 156     case WebLocalizedString::AXMediaPauseButton:
 157       return IDS_AX_MEDIA_PAUSE_BUTTON;
 158     case WebLocalizedString::AXMediaSlider:
 159       return IDS_AX_MEDIA_SLIDER;
 160     case WebLocalizedString::AXMediaSliderThumb:
 161       return IDS_AX_MEDIA_SLIDER_THUMB;
 162     case WebLocalizedString::AXMediaRewindButton:
 163       return IDS_AX_MEDIA_REWIND_BUTTON;
 164     case WebLocalizedString::AXMediaReturnToRealTime:
 165       return IDS_AX_MEDIA_RETURN_TO_REALTIME_BUTTON;
 166     case WebLocalizedString::AXMediaCurrentTimeDisplay:
 167       return IDS_AX_MEDIA_CURRENT_TIME_DISPLAY;
 168     case WebLocalizedString::AXMediaTimeRemainingDisplay:
 169       return IDS_AX_MEDIA_TIME_REMAINING_DISPLAY;
 170     case WebLocalizedString::AXMediaStatusDisplay:
 171       return IDS_AX_MEDIA_STATUS_DISPLAY;
 172     case WebLocalizedString::AXMediaEnterFullscreenButton:
 173       return IDS_AX_MEDIA_ENTER_FULL_SCREEN_BUTTON;
 174     case WebLocalizedString::AXMediaExitFullscreenButton:
 175       return IDS_AX_MEDIA_EXIT_FULL_SCREEN_BUTTON;
 176   case WebLocalizedString::AXMediaSeekForwardButton:
 177     return IDS_AX_MEDIA_SEEK_FORWARD_BUTTON;
 178     case WebLocalizedString::AXMediaSeekBackButton:
 179       return IDS_AX_MEDIA_SEEK_BACK_BUTTON;
 180     case WebLocalizedString::AXMediaShowClosedCaptionsButton:
 181       return IDS_AX_MEDIA_SHOW_CLOSED_CAPTIONS_BUTTON;
 182     case WebLocalizedString::AXMediaHideClosedCaptionsButton:
 183       return IDS_AX_MEDIA_HIDE_CLOSED_CAPTIONS_BUTTON;
 184     case WebLocalizedString::AXMediaAudioElementHelp:
 185       return IDS_AX_MEDIA_AUDIO_ELEMENT_HELP;
 186     case WebLocalizedString::AXMediaVideoElementHelp:
 187       return IDS_AX_MEDIA_VIDEO_ELEMENT_HELP;
 188     case WebLocalizedString::AXMediaMuteButtonHelp:
 189       return IDS_AX_MEDIA_MUTE_BUTTON_HELP;
 190     case WebLocalizedString::AXMediaUnMuteButtonHelp:
 191       return IDS_AX_MEDIA_UNMUTE_BUTTON_HELP;
 192     case WebLocalizedString::AXMediaPlayButtonHelp:
 193       return IDS_AX_MEDIA_PLAY_BUTTON_HELP;
 194     case WebLocalizedString::AXMediaPauseButtonHelp:
 195       return IDS_AX_MEDIA_PAUSE_BUTTON_HELP;
 196     case WebLocalizedString::AXMediaSliderHelp:
 197       return IDS_AX_MEDIA_SLIDER_HELP;
 198     case WebLocalizedString::AXMediaSliderThumbHelp:
 199       return IDS_AX_MEDIA_SLIDER_THUMB_HELP;
 200     case WebLocalizedString::AXMediaRewindButtonHelp:
 201       return IDS_AX_MEDIA_REWIND_BUTTON_HELP;
 202     case WebLocalizedString::AXMediaReturnToRealTimeHelp:
 203       return IDS_AX_MEDIA_RETURN_TO_REALTIME_BUTTON_HELP;
 204     case WebLocalizedString::AXMediaCurrentTimeDisplayHelp:
 205       return IDS_AX_MEDIA_CURRENT_TIME_DISPLAY_HELP;
 206     case WebLocalizedString::AXMediaTimeRemainingDisplayHelp:
 207       return IDS_AX_MEDIA_TIME_REMAINING_DISPLAY_HELP;
 208     case WebLocalizedString::AXMediaStatusDisplayHelp:
 209       return IDS_AX_MEDIA_STATUS_DISPLAY_HELP;
 210     case WebLocalizedString::AXMediaEnterFullscreenButtonHelp:
 211       return IDS_AX_MEDIA_ENTER_FULL_SCREEN_BUTTON_HELP;
 212     case WebLocalizedString::AXMediaExitFullscreenButtonHelp:
 213       return IDS_AX_MEDIA_EXIT_FULL_SCREEN_BUTTON_HELP;
 214   case WebLocalizedString::AXMediaSeekForwardButtonHelp:
 215     return IDS_AX_MEDIA_SEEK_FORWARD_BUTTON_HELP;
 216     case WebLocalizedString::AXMediaSeekBackButtonHelp:
 217       return IDS_AX_MEDIA_SEEK_BACK_BUTTON_HELP;
 218     case WebLocalizedString::AXMediaShowClosedCaptionsButtonHelp:
 219       return IDS_AX_MEDIA_SHOW_CLOSED_CAPTIONS_BUTTON_HELP;
 220     case WebLocalizedString::AXMediaHideClosedCaptionsButtonHelp:
 221       return IDS_AX_MEDIA_HIDE_CLOSED_CAPTIONS_BUTTON_HELP;
 222     case WebLocalizedString::AXMillisecondFieldText:
 223       return IDS_AX_MILLISECOND_FIELD_TEXT;
 224     case WebLocalizedString::AXMinuteFieldText:
 225       return IDS_AX_MINUTE_FIELD_TEXT;
 226     case WebLocalizedString::AXMonthFieldText:
 227       return IDS_AX_MONTH_FIELD_TEXT;
 228     case WebLocalizedString::AXRadioButtonActionVerb:
 229       return IDS_AX_RADIO_BUTTON_ACTION_VERB;
 230     case WebLocalizedString::AXSecondFieldText:
 231       return IDS_AX_SECOND_FIELD_TEXT;
 232     case WebLocalizedString::AXTextFieldActionVerb:
 233       return IDS_AX_TEXT_FIELD_ACTION_VERB;
 234     case WebLocalizedString::AXUncheckedCheckBoxActionVerb:
 235       return IDS_AX_UNCHECKED_CHECK_BOX_ACTION_VERB;
 236     case WebLocalizedString::AXWebAreaText:
 237       return IDS_AX_ROLE_WEB_AREA;
 238     case WebLocalizedString::AXWeekOfYearFieldText:
 239       return IDS_AX_WEEK_OF_YEAR_FIELD_TEXT;
 240     case WebLocalizedString::AXYearFieldText:
 241       return IDS_AX_YEAR_FIELD_TEXT;
 242     case WebLocalizedString::CalendarClear:
 243       return IDS_FORM_CALENDAR_CLEAR;
 244     case WebLocalizedString::CalendarToday:
 245       return IDS_FORM_CALENDAR_TODAY;
 246     case WebLocalizedString::DateFormatDayInMonthLabel:
 247       return IDS_FORM_DATE_FORMAT_DAY_IN_MONTH;
 248     case WebLocalizedString::DateFormatMonthLabel:
 249       return IDS_FORM_DATE_FORMAT_MONTH;
 250     case WebLocalizedString::DateFormatYearLabel:
 251       return IDS_FORM_DATE_FORMAT_YEAR;
 252     case WebLocalizedString::DetailsLabel:
 253       return IDS_DETAILS_WITHOUT_SUMMARY_LABEL;
 254     case WebLocalizedString::FileButtonChooseFileLabel:
 255       return IDS_FORM_FILE_BUTTON_LABEL;
 256     case WebLocalizedString::FileButtonChooseMultipleFilesLabel:
 257       return IDS_FORM_MULTIPLE_FILES_BUTTON_LABEL;
 258     case WebLocalizedString::FileButtonNoFileSelectedLabel:
 259       return IDS_FORM_FILE_NO_FILE_LABEL;
 260     case WebLocalizedString::InputElementAltText:
 261       return IDS_FORM_INPUT_ALT;
 262     case WebLocalizedString::KeygenMenuHighGradeKeySize:
 263       return IDS_KEYGEN_HIGH_GRADE_KEY;
 264     case WebLocalizedString::KeygenMenuMediumGradeKeySize:
 265       return IDS_KEYGEN_MED_GRADE_KEY;
 266     case WebLocalizedString::MissingPluginText:
 267       return IDS_PLUGIN_INITIALIZATION_ERROR;
 268     case WebLocalizedString::MultipleFileUploadText:
 269       return IDS_FORM_FILE_MULTIPLE_UPLOAD;
 270     case WebLocalizedString::OtherColorLabel:
 271       return IDS_FORM_OTHER_COLOR_LABEL;
 272     case WebLocalizedString::OtherDateLabel:
 273         return IDS_FORM_OTHER_DATE_LABEL;
 274     case WebLocalizedString::OtherMonthLabel:
 275       return IDS_FORM_OTHER_MONTH_LABEL;
 276     case WebLocalizedString::OtherTimeLabel:
 277       return IDS_FORM_OTHER_TIME_LABEL;
 278     case WebLocalizedString::OtherWeekLabel:
 279       return IDS_FORM_OTHER_WEEK_LABEL;
 280     case WebLocalizedString::PlaceholderForDayOfMonthField:
 281       return IDS_FORM_PLACEHOLDER_FOR_DAY_OF_MONTH_FIELD;
 282     case WebLocalizedString::PlaceholderForMonthField:
 283       return IDS_FORM_PLACEHOLDER_FOR_MONTH_FIELD;
 284     case WebLocalizedString::PlaceholderForYearField:
 285       return IDS_FORM_PLACEHOLDER_FOR_YEAR_FIELD;
 286     case WebLocalizedString::ResetButtonDefaultLabel:
 287       return IDS_FORM_RESET_LABEL;
 288     case WebLocalizedString::SearchableIndexIntroduction:
 289       return IDS_SEARCHABLE_INDEX_INTRO;
 290     case WebLocalizedString::SearchMenuClearRecentSearchesText:
 291       return IDS_RECENT_SEARCHES_CLEAR;
 292     case WebLocalizedString::SearchMenuNoRecentSearchesText:
 293       return IDS_RECENT_SEARCHES_NONE;
 294     case WebLocalizedString::SearchMenuRecentSearchesText:
 295       return IDS_RECENT_SEARCHES;
 296     case WebLocalizedString::SubmitButtonDefaultLabel:
 297       return IDS_FORM_SUBMIT_LABEL;
 298     case WebLocalizedString::ThisMonthButtonLabel:
 299       return IDS_FORM_THIS_MONTH_LABEL;
 300     case WebLocalizedString::ThisWeekButtonLabel:
 301       return IDS_FORM_THIS_WEEK_LABEL;
 302     case WebLocalizedString::ValidationBadInputForDateTime:
 303       return IDS_FORM_VALIDATION_BAD_INPUT_DATETIME;
 304     case WebLocalizedString::ValidationBadInputForNumber:
 305       return IDS_FORM_VALIDATION_BAD_INPUT_NUMBER;
 306     case WebLocalizedString::ValidationPatternMismatch:
 307       return IDS_FORM_VALIDATION_PATTERN_MISMATCH;
 308     case WebLocalizedString::ValidationRangeOverflow:
 309       return IDS_FORM_VALIDATION_RANGE_OVERFLOW;
 310     case WebLocalizedString::ValidationRangeOverflowDateTime:
 311       return IDS_FORM_VALIDATION_RANGE_OVERFLOW_DATETIME;
 312     case WebLocalizedString::ValidationRangeUnderflow:
 313       return IDS_FORM_VALIDATION_RANGE_UNDERFLOW;
 314     case WebLocalizedString::ValidationRangeUnderflowDateTime:
 315       return IDS_FORM_VALIDATION_RANGE_UNDERFLOW_DATETIME;
 316     case WebLocalizedString::ValidationStepMismatch:
 317       return IDS_FORM_VALIDATION_STEP_MISMATCH;
 318     case WebLocalizedString::ValidationStepMismatchCloseToLimit:
 319       return IDS_FORM_VALIDATION_STEP_MISMATCH_CLOSE_TO_LIMIT;
 320     case WebLocalizedString::ValidationTooLong:
 321       return IDS_FORM_VALIDATION_TOO_LONG;
 322     case WebLocalizedString::ValidationTypeMismatch:
 323       return IDS_FORM_VALIDATION_TYPE_MISMATCH;
 324     case WebLocalizedString::ValidationTypeMismatchForEmail:
 325       return IDS_FORM_VALIDATION_TYPE_MISMATCH_EMAIL;
 326     case WebLocalizedString::ValidationTypeMismatchForEmailEmpty:
 327       return IDS_FORM_VALIDATION_TYPE_MISMATCH_EMAIL_EMPTY;
 328     case WebLocalizedString::ValidationTypeMismatchForEmailEmptyDomain:
 329       return IDS_FORM_VALIDATION_TYPE_MISMATCH_EMAIL_EMPTY_DOMAIN;
 330     case WebLocalizedString::ValidationTypeMismatchForEmailEmptyLocal:
 331       return IDS_FORM_VALIDATION_TYPE_MISMATCH_EMAIL_EMPTY_LOCAL;
 332     case WebLocalizedString::ValidationTypeMismatchForEmailInvalidDomain:
 333       return IDS_FORM_VALIDATION_TYPE_MISMATCH_EMAIL_INVALID_DOMAIN;
 334     case WebLocalizedString::ValidationTypeMismatchForEmailInvalidDots:
 335       return IDS_FORM_VALIDATION_TYPE_MISMATCH_EMAIL_INVALID_DOTS;
 336     case WebLocalizedString::ValidationTypeMismatchForEmailInvalidLocal:
 337       return IDS_FORM_VALIDATION_TYPE_MISMATCH_EMAIL_INVALID_LOCAL;
 338     case WebLocalizedString::ValidationTypeMismatchForEmailNoAtSign:
 339       return IDS_FORM_VALIDATION_TYPE_MISMATCH_EMAIL_NO_AT_SIGN;
 340     case WebLocalizedString::ValidationTypeMismatchForMultipleEmail:
 341       return IDS_FORM_VALIDATION_TYPE_MISMATCH_MULTIPLE_EMAIL;
 342     case WebLocalizedString::ValidationTypeMismatchForURL:
 343       return IDS_FORM_VALIDATION_TYPE_MISMATCH_URL;
 344     case WebLocalizedString::ValidationValueMissing:
 345       return IDS_FORM_VALIDATION_VALUE_MISSING;
 346     case WebLocalizedString::ValidationValueMissingForCheckbox:
 347       return IDS_FORM_VALIDATION_VALUE_MISSING_CHECKBOX;
 348     case WebLocalizedString::ValidationValueMissingForFile:
 349       return IDS_FORM_VALIDATION_VALUE_MISSING_FILE;
 350     case WebLocalizedString::ValidationValueMissingForMultipleFile:
 351       return IDS_FORM_VALIDATION_VALUE_MISSING_MULTIPLE_FILE;
 352     case WebLocalizedString::ValidationValueMissingForRadio:
 353       return IDS_FORM_VALIDATION_VALUE_MISSING_RADIO;
 354     case WebLocalizedString::ValidationValueMissingForSelect:
 355       return IDS_FORM_VALIDATION_VALUE_MISSING_SELECT;
 356     case WebLocalizedString::WeekFormatTemplate:
 357       return IDS_FORM_INPUT_WEEK_TEMPLATE;
 358     case WebLocalizedString::WeekNumberLabel:
 359       return IDS_FORM_WEEK_NUMBER_LABEL;
 360     // This "default:" line exists to avoid compile warnings about enum
 361     // coverage when we add a new symbol to WebLocalizedString.h in WebKit.
 362     // After a planned WebKit patch is landed, we need to add a case statement
 363     // for the added symbol here.
 364     default:
 365       break;
 366   }
 367   return -1;
 368 }
 369
 370 WebKitPlatformSupportImpl::WebKitPlatformSupportImpl()
 371     : main_loop_(base::MessageLoop::current()),
 372       shared_timer_func_(NULL),
 373       shared_timer_fire_time_(0.0),
 374       shared_timer_fire_time_was_set_while_suspended_(false),
 375       shared_timer_suspended_(0) {}
 376
 377 WebKitPlatformSupportImpl::~WebKitPlatformSupportImpl() {
 378 }
 379
 380 WebURLLoader* WebKitPlatformSupportImpl::createURLLoader() {
 381   return new WebURLLoaderImpl(this);
 382 }
 383
 384 WebSocketStreamHandle* WebKitPlatformSupportImpl::createSocketStreamHandle() {
 385   return new WebSocketStreamHandleImpl(this);
 386 }
 387
 388 WebString WebKitPlatformSupportImpl::userAgent(const WebURL& url) {
 389   return WebString::fromUTF8(webkit_glue::GetUserAgent(url));
 390 }
 391
 392 WebData WebKitPlatformSupportImpl::parseDataURL(
 393     const WebURL& url,
 394     WebString& mimetype_out,
 395     WebString& charset_out) {
 396   std::string mime_type, char_set, data;
 397   if (net::DataURL::Parse(url, &mime_type, &char_set, &data)
 398       && net::IsSupportedMimeType(mime_type)) {
 399     mimetype_out = WebString::fromUTF8(mime_type);
 400     charset_out = WebString::fromUTF8(char_set);
 401     return data;
 402   }
 403   return WebData();
 404 }
 405
 406 WebURLError WebKitPlatformSupportImpl::cancelledError(
 407     const WebURL& unreachableURL) const {
 408   return WebURLLoaderImpl::CreateError(unreachableURL, net::ERR_ABORTED);
 409 }
 410
 411 void WebKitPlatformSupportImpl::decrementStatsCounter(const char* name) {
 412   base::StatsCounter(name).Decrement();
 413 }
 414
 415 void WebKitPlatformSupportImpl::incrementStatsCounter(const char* name) {
 416   base::StatsCounter(name).Increment();
 417 }
 418
 419 void WebKitPlatformSupportImpl::histogramCustomCounts(
 420     const char* name, int sample, int min, int max, int bucket_count) {
 421   // Copied from histogram macro, but without the static variable caching
 422   // the histogram because name is dynamic.
 423   base::HistogramBase* counter =
 424       base::Histogram::FactoryGet(name, min, max, bucket_count,
 425           base::HistogramBase::kUmaTargetedHistogramFlag);
 426   DCHECK_EQ(name, counter->histogram_name());
 427   counter->Add(sample);
 428 }
 429
 430 void WebKitPlatformSupportImpl::histogramEnumeration(
 431     const char* name, int sample, int boundary_value) {
 432   // Copied from histogram macro, but without the static variable caching
 433   // the histogram because name is dynamic.
 434   base::HistogramBase* counter =
 435       base::LinearHistogram::FactoryGet(name, 1, boundary_value,
 436           boundary_value + 1, base::HistogramBase::kUmaTargetedHistogramFlag);
 437   DCHECK_EQ(name, counter->histogram_name());
 438   counter->Add(sample);
 439 }
 440
 441 void WebKitPlatformSupportImpl::histogramSparse(const char* name, int sample) {
 442   // For sparse histograms, we can use the macro, as it does not incorporate a
 443   // static.
 444   UMA_HISTOGRAM_SPARSE_SLOWLY(name, sample);
 445 }
 446
 447 const unsigned char* WebKitPlatformSupportImpl::getTraceCategoryEnabledFlag(
 448     const char* category_group) {
 449   return TRACE_EVENT_API_GET_CATEGORY_GROUP_ENABLED(category_group);
 450 }
 451
 452 long* WebKitPlatformSupportImpl::getTraceSamplingState(
 453     const unsigned thread_bucket) {
 454   switch (thread_bucket) {
 455     case 0:
 456       return reinterpret_cast<long*>(&TRACE_EVENT_API_THREAD_BUCKET(0));
 457     case 1:
 458       return reinterpret_cast<long*>(&TRACE_EVENT_API_THREAD_BUCKET(1));
 459     case 2:
 460       return reinterpret_cast<long*>(&TRACE_EVENT_API_THREAD_BUCKET(2));
 461     default:
 462       NOTREACHED() << "Unknown thread bucket type.";
 463   }
 464   return NULL;
 465 }
 466
 467 void WebKitPlatformSupportImpl::addTraceEvent(
 468     char phase,
 469     const unsigned char* category_group_enabled,
 470     const char* name,
 471     unsigned long long id,
 472     int num_args,
 473     const char** arg_names,
 474     const unsigned char* arg_types,
 475     const unsigned long long* arg_values,
 476     unsigned char flags) {
 477   TRACE_EVENT_API_ADD_TRACE_EVENT(phase, category_group_enabled, name, id,
 478                                   num_args, arg_names, arg_types,
 479                                   arg_values, NULL, flags);
 480 }
 481
 482
 483 namespace {
 484
 485 WebData loadAudioSpatializationResource(WebKitPlatformSupportImpl* platform,
 486                                         const char* name) {
 487 #ifdef IDR_AUDIO_SPATIALIZATION_COMPOSITE
 488   if (!strcmp(name, "Composite")) {
 489     base::StringPiece resource =
 490         platform->GetDataResource(IDR_AUDIO_SPATIALIZATION_COMPOSITE,
 491                                   ui::SCALE_FACTOR_NONE);
 492     return WebData(resource.data(), resource.size());
 493   }
 494 #endif
 495
 496 #ifdef IDR_AUDIO_SPATIALIZATION_T000_P000
 497   const size_t kExpectedSpatializationNameLength = 31;
 498   if (strlen(name) != kExpectedSpatializationNameLength) {
 499     return WebData();
 500   }
 501
 502   // Extract the azimuth and elevation from the resource name.
 503   int azimuth = 0;
 504   int elevation = 0;
 505   int values_parsed =
 506       sscanf(name, "IRC_Composite_C_R0195_T%3d_P%3d", &azimuth, &elevation);
 507   if (values_parsed != 2) {
 508     return WebData();
 509   }
 510
 511   // The resource index values go through the elevations first, then azimuths.
 512   const int kAngleSpacing = 15;
 513
 514   // 0 <= elevation <= 90 (or 315 <= elevation <= 345)
 515   // in increments of 15 degrees.
 516   int elevation_index =
 517       elevation <= 90 ? elevation / kAngleSpacing :
 518       7 + (elevation - 315) / kAngleSpacing;
 519   bool is_elevation_index_good = 0 <= elevation_index && elevation_index < 10;
 520
 521   // 0 <= azimuth < 360 in increments of 15 degrees.
 522   int azimuth_index = azimuth / kAngleSpacing;
 523   bool is_azimuth_index_good = 0 <= azimuth_index && azimuth_index < 24;
 524
 525   const int kNumberOfElevations = 10;
 526   const int kNumberOfAudioResources = 240;
 527   int resource_index = kNumberOfElevations * azimuth_index + elevation_index;
 528   bool is_resource_index_good = 0 <= resource_index &&
 529       resource_index < kNumberOfAudioResources;
 530
 531   if (is_azimuth_index_good && is_elevation_index_good &&
 532       is_resource_index_good) {
 533     const int kFirstAudioResourceIndex = IDR_AUDIO_SPATIALIZATION_T000_P000;
 534     base::StringPiece resource =
 535         platform->GetDataResource(kFirstAudioResourceIndex + resource_index,
 536                                   ui::SCALE_FACTOR_NONE);
 537     return WebData(resource.data(), resource.size());
 538   }
 539 #endif  // IDR_AUDIO_SPATIALIZATION_T000_P000
 540
 541   NOTREACHED();
 542   return WebData();
 543 }
 544
 545 struct DataResource {
 546   const char* name;
 547   int id;
 548   ui::ScaleFactor scale_factor;
 549 };
 550
 551 const DataResource kDataResources[] = {
 552   { "missingImage", IDR_BROKENIMAGE, ui::SCALE_FACTOR_100P },
 553   { "missingImage@2x", IDR_BROKENIMAGE, ui::SCALE_FACTOR_200P },
 554   { "mediaplayerPause", IDR_MEDIAPLAYER_PAUSE_BUTTON, ui::SCALE_FACTOR_100P },
 555   { "mediaplayerPauseHover",
 556     IDR_MEDIAPLAYER_PAUSE_BUTTON_HOVER, ui::SCALE_FACTOR_100P },
 557   { "mediaplayerPauseDown",
 558     IDR_MEDIAPLAYER_PAUSE_BUTTON_DOWN, ui::SCALE_FACTOR_100P },
 559   { "mediaplayerPlay", IDR_MEDIAPLAYER_PLAY_BUTTON, ui::SCALE_FACTOR_100P },
 560   { "mediaplayerPlayHover",
 561     IDR_MEDIAPLAYER_PLAY_BUTTON_HOVER, ui::SCALE_FACTOR_100P },
 562   { "mediaplayerPlayDown",
 563     IDR_MEDIAPLAYER_PLAY_BUTTON_DOWN, ui::SCALE_FACTOR_100P },
 564   { "mediaplayerPlayDisabled",
 565     IDR_MEDIAPLAYER_PLAY_BUTTON_DISABLED, ui::SCALE_FACTOR_100P },
 566   { "mediaplayerSoundLevel3",
 567     IDR_MEDIAPLAYER_SOUND_LEVEL3_BUTTON, ui::SCALE_FACTOR_100P },
 568   { "mediaplayerSoundLevel3Hover",
 569     IDR_MEDIAPLAYER_SOUND_LEVEL3_BUTTON_HOVER, ui::SCALE_FACTOR_100P },
 570   { "mediaplayerSoundLevel3Down",
 571     IDR_MEDIAPLAYER_SOUND_LEVEL3_BUTTON_DOWN, ui::SCALE_FACTOR_100P },
 572   { "mediaplayerSoundLevel2",
 573     IDR_MEDIAPLAYER_SOUND_LEVEL2_BUTTON, ui::SCALE_FACTOR_100P },
 574   { "mediaplayerSoundLevel2Hover",
 575     IDR_MEDIAPLAYER_SOUND_LEVEL2_BUTTON_HOVER, ui::SCALE_FACTOR_100P },
 576   { "mediaplayerSoundLevel2Down",
 577     IDR_MEDIAPLAYER_SOUND_LEVEL2_BUTTON_DOWN, ui::SCALE_FACTOR_100P },
 578   { "mediaplayerSoundLevel1",
 579     IDR_MEDIAPLAYER_SOUND_LEVEL1_BUTTON, ui::SCALE_FACTOR_100P },
 580   { "mediaplayerSoundLevel1Hover",
 581     IDR_MEDIAPLAYER_SOUND_LEVEL1_BUTTON_HOVER, ui::SCALE_FACTOR_100P },
 582   { "mediaplayerSoundLevel1Down",
 583     IDR_MEDIAPLAYER_SOUND_LEVEL1_BUTTON_DOWN, ui::SCALE_FACTOR_100P },
 584   { "mediaplayerSoundLevel0",
 585     IDR_MEDIAPLAYER_SOUND_LEVEL0_BUTTON, ui::SCALE_FACTOR_100P },
 586   { "mediaplayerSoundLevel0Hover",
 587     IDR_MEDIAPLAYER_SOUND_LEVEL0_BUTTON_HOVER, ui::SCALE_FACTOR_100P },
 588   { "mediaplayerSoundLevel0Down",
 589     IDR_MEDIAPLAYER_SOUND_LEVEL0_BUTTON_DOWN, ui::SCALE_FACTOR_100P },
 590   { "mediaplayerSoundDisabled",
 591     IDR_MEDIAPLAYER_SOUND_DISABLED, ui::SCALE_FACTOR_100P },
 592   { "mediaplayerSliderThumb",
 593     IDR_MEDIAPLAYER_SLIDER_THUMB, ui::SCALE_FACTOR_100P },
 594   { "mediaplayerSliderThumbHover",
 595     IDR_MEDIAPLAYER_SLIDER_THUMB_HOVER, ui::SCALE_FACTOR_100P },
 596   { "mediaplayerSliderThumbDown",
 597     IDR_MEDIAPLAYER_SLIDER_THUMB_DOWN, ui::SCALE_FACTOR_100P },
 598   { "mediaplayerVolumeSliderThumb",
 599     IDR_MEDIAPLAYER_VOLUME_SLIDER_THUMB, ui::SCALE_FACTOR_100P },
 600   { "mediaplayerVolumeSliderThumbHover",
 601     IDR_MEDIAPLAYER_VOLUME_SLIDER_THUMB_HOVER, ui::SCALE_FACTOR_100P },
 602   { "mediaplayerVolumeSliderThumbDown",
 603     IDR_MEDIAPLAYER_VOLUME_SLIDER_THUMB_DOWN, ui::SCALE_FACTOR_100P },
 604   { "mediaplayerVolumeSliderThumbDisabled",
 605     IDR_MEDIAPLAYER_VOLUME_SLIDER_THUMB_DISABLED, ui::SCALE_FACTOR_100P },
 606   { "mediaplayerClosedCaption",
 607     IDR_MEDIAPLAYER_CLOSEDCAPTION_BUTTON, ui::SCALE_FACTOR_100P },
 608   { "mediaplayerClosedCaptionHover",
 609     IDR_MEDIAPLAYER_CLOSEDCAPTION_BUTTON_HOVER, ui::SCALE_FACTOR_100P },
 610   { "mediaplayerClosedCaptionDown",
 611     IDR_MEDIAPLAYER_CLOSEDCAPTION_BUTTON_DOWN, ui::SCALE_FACTOR_100P },
 612   { "mediaplayerClosedCaptionDisabled",
 613     IDR_MEDIAPLAYER_CLOSEDCAPTION_BUTTON_DISABLED, ui::SCALE_FACTOR_100P },
 614   { "mediaplayerFullscreen",
 615     IDR_MEDIAPLAYER_FULLSCREEN_BUTTON, ui::SCALE_FACTOR_100P },
 616   { "mediaplayerFullscreenHover",
 617     IDR_MEDIAPLAYER_FULLSCREEN_BUTTON_HOVER, ui::SCALE_FACTOR_100P },
 618   { "mediaplayerFullscreenDown",
 619     IDR_MEDIAPLAYER_FULLSCREEN_BUTTON_DOWN, ui::SCALE_FACTOR_100P },
 620   { "mediaplayerFullscreenDisabled",
 621     IDR_MEDIAPLAYER_FULLSCREEN_BUTTON_DISABLED, ui::SCALE_FACTOR_100P },
 622 #if defined(OS_ANDROID)
 623   { "mediaplayerOverlayPlay",
 624     IDR_MEDIAPLAYER_OVERLAY_PLAY_BUTTON, ui::SCALE_FACTOR_100P },
 625 #endif
 626 #if defined(OS_MACOSX)
 627   { "overhangPattern", IDR_OVERHANG_PATTERN, ui::SCALE_FACTOR_100P },
 628   { "overhangShadow", IDR_OVERHANG_SHADOW, ui::SCALE_FACTOR_100P },
 629 #endif
 630   { "panIcon", IDR_PAN_SCROLL_ICON, ui::SCALE_FACTOR_100P },
 631   { "searchCancel", IDR_SEARCH_CANCEL, ui::SCALE_FACTOR_100P },
 632   { "searchCancelPressed", IDR_SEARCH_CANCEL_PRESSED, ui::SCALE_FACTOR_100P },
 633   { "searchMagnifier", IDR_SEARCH_MAGNIFIER, ui::SCALE_FACTOR_100P },
 634   { "searchMagnifierResults",
 635     IDR_SEARCH_MAGNIFIER_RESULTS, ui::SCALE_FACTOR_100P },
 636   { "textAreaResizeCorner", IDR_TEXTAREA_RESIZER, ui::SCALE_FACTOR_100P },
 637   { "textAreaResizeCorner@2x", IDR_TEXTAREA_RESIZER, ui::SCALE_FACTOR_200P },
 638   { "inputSpeech", IDR_INPUT_SPEECH, ui::SCALE_FACTOR_100P },
 639   { "inputSpeechRecording", IDR_INPUT_SPEECH_RECORDING, ui::SCALE_FACTOR_100P },
 640   { "inputSpeechWaiting", IDR_INPUT_SPEECH_WAITING, ui::SCALE_FACTOR_100P },
 641   { "americanExpressCC", IDR_AUTOFILL_CC_AMEX, ui::SCALE_FACTOR_100P },
 642   { "dinersCC", IDR_AUTOFILL_CC_DINERS, ui::SCALE_FACTOR_100P },
 643   { "discoverCC", IDR_AUTOFILL_CC_DISCOVER, ui::SCALE_FACTOR_100P },
 644   { "genericCC", IDR_AUTOFILL_CC_GENERIC, ui::SCALE_FACTOR_100P },
 645   { "jcbCC", IDR_AUTOFILL_CC_JCB, ui::SCALE_FACTOR_100P },
 646   { "masterCardCC", IDR_AUTOFILL_CC_MASTERCARD, ui::SCALE_FACTOR_100P },
 647   { "visaCC", IDR_AUTOFILL_CC_VISA, ui::SCALE_FACTOR_100P },
 648   { "generatePassword", IDR_PASSWORD_GENERATION_ICON, ui::SCALE_FACTOR_100P },
 649   { "generatePasswordHover",
 650     IDR_PASSWORD_GENERATION_ICON_HOVER, ui::SCALE_FACTOR_100P },
 651   { "syntheticTouchCursor",
 652     IDR_SYNTHETIC_TOUCH_CURSOR, ui::SCALE_FACTOR_100P },
 653 };
 654
 655 }  // namespace
 656
 657 WebData WebKitPlatformSupportImpl::loadResource(const char* name) {
 658   // Some clients will call into this method with an empty |name| when they have
 659   // optional resources.  For example, the PopupMenuChromium code can have icons
 660   // for some Autofill items but not for others.
 661   if (!strlen(name))
 662     return WebData();
 663
 664   // Check the name prefix to see if it's an audio resource.
 665   if (StartsWithASCII(name, "IRC_Composite", true) ||
 666       StartsWithASCII(name, "Composite", true))
 667     return loadAudioSpatializationResource(this, name);
 668
 669   // TODO(flackr): We should use a better than linear search here, a trie would
 670   // be ideal.
 671   for (size_t i = 0; i < arraysize(kDataResources); ++i) {
 672     if (!strcmp(name, kDataResources[i].name)) {
 673       base::StringPiece resource =
 674           GetDataResource(kDataResources[i].id,
 675                           kDataResources[i].scale_factor);
 676       return WebData(resource.data(), resource.size());
 677     }
 678   }
 679
 680   NOTREACHED() << "Unknown image resource " << name;
 681   return WebData();
 682 }
 683
 684 WebString WebKitPlatformSupportImpl::queryLocalizedString(
 685     WebLocalizedString::Name name) {
 686   int message_id = ToMessageID(name);
 687   if (message_id < 0)
 688     return WebString();
 689   return GetLocalizedString(message_id);
 690 }
 691
 692 WebString WebKitPlatformSupportImpl::queryLocalizedString(
 693     WebLocalizedString::Name name, int numeric_value) {
 694   return queryLocalizedString(name, base::IntToString16(numeric_value));
 695 }
 696
 697 WebString WebKitPlatformSupportImpl::queryLocalizedString(
 698     WebLocalizedString::Name name, const WebString& value) {
 699   int message_id = ToMessageID(name);
 700   if (message_id < 0)
 701     return WebString();
 702   return ReplaceStringPlaceholders(GetLocalizedString(message_id), value, NULL);
 703 }
 704
 705 WebString WebKitPlatformSupportImpl::queryLocalizedString(
 706     WebLocalizedString::Name name,
 707     const WebString& value1,
 708     const WebString& value2) {
 709   int message_id = ToMessageID(name);
 710   if (message_id < 0)
 711     return WebString();
 712   std::vector<base::string16> values;
 713   values.reserve(2);
 714   values.push_back(value1);
 715   values.push_back(value2);
 716   return ReplaceStringPlaceholders(
 717       GetLocalizedString(message_id), values, NULL);
 718 }
 719
 720 double WebKitPlatformSupportImpl::currentTime() {
 721   return base::Time::Now().ToDoubleT();
 722 }
 723
 724 double WebKitPlatformSupportImpl::monotonicallyIncreasingTime() {
 725   return base::TimeTicks::Now().ToInternalValue() /
 726       static_cast<double>(base::Time::kMicrosecondsPerSecond);
 727 }
 728
 729 void WebKitPlatformSupportImpl::cryptographicallyRandomValues(
 730     unsigned char* buffer, size_t length) {
 731   base::RandBytes(buffer, length);
 732 }
 733
 734 void WebKitPlatformSupportImpl::setSharedTimerFiredFunction(void (*func)()) {
 735   shared_timer_func_ = func;
 736 }
 737
 738 void WebKitPlatformSupportImpl::setSharedTimerFireInterval(
 739     double interval_seconds) {
 740   shared_timer_fire_time_ = interval_seconds + monotonicallyIncreasingTime();
 741   if (shared_timer_suspended_) {
 742     shared_timer_fire_time_was_set_while_suspended_ = true;
 743     return;
 744   }
 745
 746   // By converting between double and int64 representation, we run the risk
 747   // of losing precision due to rounding errors. Performing computations in
 748   // microseconds reduces this risk somewhat. But there still is the potential
 749   // of us computing a fire time for the timer that is shorter than what we
 750   // need.
 751   // As the event loop will check event deadlines prior to actually firing
 752   // them, there is a risk of needlessly rescheduling events and of
 753   // needlessly looping if sleep times are too short even by small amounts.
 754   // This results in measurable performance degradation unless we use ceil() to
 755   // always round up the sleep times.
 756   int64 interval = static_cast<int64>(
 757       ceil(interval_seconds * base::Time::kMillisecondsPerSecond)
 758       * base::Time::kMicrosecondsPerMillisecond);
 759
 760   if (interval < 0)
 761     interval = 0;
 762
 763   shared_timer_.Stop();
 764   shared_timer_.Start(FROM_HERE, base::TimeDelta::FromMicroseconds(interval),
 765                       this, &WebKitPlatformSupportImpl::DoTimeout);
 766   OnStartSharedTimer(base::TimeDelta::FromMicroseconds(interval));
 767 }
 768
 769 void WebKitPlatformSupportImpl::stopSharedTimer() {
 770   shared_timer_.Stop();
 771 }
 772
 773 void WebKitPlatformSupportImpl::callOnMainThread(
 774     void (*func)(void*), void* context) {
 775   main_loop_->PostTask(FROM_HERE, base::Bind(func, context));
 776 }
 777
 778 base::PlatformFile WebKitPlatformSupportImpl::databaseOpenFile(
 779     const WebKit::WebString& vfs_file_name, int desired_flags) {
 780   return base::kInvalidPlatformFileValue;
 781 }
 782
 783 int WebKitPlatformSupportImpl::databaseDeleteFile(
 784     const WebKit::WebString& vfs_file_name, bool sync_dir) {
 785   return -1;
 786 }
 787
 788 long WebKitPlatformSupportImpl::databaseGetFileAttributes(
 789     const WebKit::WebString& vfs_file_name) {
 790   return 0;
 791 }
 792
 793 long long WebKitPlatformSupportImpl::databaseGetFileSize(
 794     const WebKit::WebString& vfs_file_name) {
 795   return 0;
 796 }
 797
 798 long long WebKitPlatformSupportImpl::databaseGetSpaceAvailableForOrigin(
 799     const WebKit::WebString& origin_identifier) {
 800   return 0;
 801 }
 802
 803 WebKit::WebString WebKitPlatformSupportImpl::signedPublicKeyAndChallengeString(
 804     unsigned key_size_index,
 805     const WebKit::WebString& challenge,
 806     const WebKit::WebURL& url) {
 807   return WebKit::WebString("");
 808 }
 809
 810 static scoped_ptr<base::ProcessMetrics> CurrentProcessMetrics() {
 811   using base::ProcessMetrics;
 812 #if defined(OS_MACOSX)
 813   return scoped_ptr<ProcessMetrics>(
 814       // The default port provider is sufficient to get data for the current
 815       // process.
 816       ProcessMetrics::CreateProcessMetrics(base::GetCurrentProcessHandle(),
 817                                            NULL));
 818 #else
 819   return scoped_ptr<ProcessMetrics>(
 820       ProcessMetrics::CreateProcessMetrics(base::GetCurrentProcessHandle()));
 821 #endif
 822 }
 823
 824 static size_t getMemoryUsageMB(bool bypass_cache) {
 825   size_t current_mem_usage = 0;
 826   MemoryUsageCache* mem_usage_cache_singleton = MemoryUsageCache::GetInstance();
 827   if (!bypass_cache &&
 828       mem_usage_cache_singleton->IsCachedValueValid(&current_mem_usage))
 829     return current_mem_usage;
 830
 831   current_mem_usage = MemoryUsageKB() >> 10;
 832   mem_usage_cache_singleton->SetMemoryValue(current_mem_usage);
 833   return current_mem_usage;
 834 }
 835
 836 size_t WebKitPlatformSupportImpl::memoryUsageMB() {
 837   return getMemoryUsageMB(false);
 838 }
 839
 840 size_t WebKitPlatformSupportImpl::actualMemoryUsageMB() {
 841   return getMemoryUsageMB(true);
 842 }
 843
 844 void WebKitPlatformSupportImpl::startHeapProfiling(
 845   const WebKit::WebString& prefix) {
 846   // FIXME(morrita): Make this built on windows.
 847 #if !defined(NO_TCMALLOC) && defined(USE_TCMALLOC) && !defined(OS_WIN)
 848   HeapProfilerStart(prefix.utf8().data());
 849 #endif
 850 }
 851
 852 void WebKitPlatformSupportImpl::stopHeapProfiling() {
 853 #if !defined(NO_TCMALLOC) && defined(USE_TCMALLOC) && !defined(OS_WIN)
 854   HeapProfilerStop();
 855 #endif
 856 }
 857
 858 void WebKitPlatformSupportImpl::dumpHeapProfiling(
 859   const WebKit::WebString& reason) {
 860 #if !defined(NO_TCMALLOC) && defined(USE_TCMALLOC) && !defined(OS_WIN)
 861   HeapProfilerDump(reason.utf8().data());
 862 #endif
 863 }
 864
 865 WebString WebKitPlatformSupportImpl::getHeapProfile() {
 866 #if !defined(NO_TCMALLOC) && defined(USE_TCMALLOC) && !defined(OS_WIN)
 867   char* data = GetHeapProfile();
 868   WebString result = WebString::fromUTF8(std::string(data));
 869   free(data);
 870   return result;
 871 #else
 872   return WebString();
 873 #endif
 874 }
 875
 876 bool WebKitPlatformSupportImpl::processMemorySizesInBytes(
 877     size_t* private_bytes,
 878     size_t* shared_bytes) {
 879   return CurrentProcessMetrics()->GetMemoryBytes(private_bytes, shared_bytes);
 880 }
 881
 882 bool WebKitPlatformSupportImpl::memoryAllocatorWasteInBytes(size_t* size) {
 883   return base::allocator::GetAllocatorWasteSize(size);
 884 }
 885
 886 void WebKitPlatformSupportImpl::SuspendSharedTimer() {
 887   ++shared_timer_suspended_;
 888 }
 889
 890 void WebKitPlatformSupportImpl::ResumeSharedTimer() {
 891   // The shared timer may have fired or been adjusted while we were suspended.
 892   if (--shared_timer_suspended_ == 0 &&
 893       (!shared_timer_.IsRunning() ||
 894        shared_timer_fire_time_was_set_while_suspended_)) {
 895     shared_timer_fire_time_was_set_while_suspended_ = false;
 896     setSharedTimerFireInterval(
 897         shared_timer_fire_time_ - monotonicallyIncreasingTime());
 898   }
 899 }
 900
 901 }  // namespace webkit_glue