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