content/renderer/render_thread_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 "content/renderer/render_thread_impl.h"
   6
   7 #include <algorithm>
   8 #include <limits>
   9 #include <map>
  10 #include <vector>
  11
  12 #include "base/allocator/allocator_extension.h"
  13 #include "base/command_line.h"
  14 #include "base/lazy_instance.h"
  15 #include "base/logging.h"
  16 #include "base/memory/discardable_memory.h"
  17 #include "base/memory/discardable_memory_emulated.h"
  18 #include "base/memory/discardable_memory_shmem_allocator.h"
  19 #include "base/memory/shared_memory.h"
  20 #include "base/metrics/field_trial.h"
  21 #include "base/metrics/histogram.h"
  22 #include "base/path_service.h"
  23 #include "base/single_thread_task_runner.h"
  24 #include "base/strings/string16.h"
  25 #include "base/strings/string_number_conversions.h"
  26 #include "base/strings/string_tokenizer.h"
  27 #include "base/strings/sys_string_conversions.h"
  28 #include "base/strings/utf_string_conversions.h"
  29 #include "base/threading/thread_local.h"
  30 #include "base/threading/thread_restrictions.h"
  31 #include "base/trace_event/trace_event.h"
  32 #include "base/values.h"
  33 #include "cc/base/switches.h"
  34 #include "cc/blink/web_external_bitmap_impl.h"
  35 #include "cc/blink/web_layer_impl.h"
  36 #include "cc/resources/tile_task_worker_pool.h"
  37 #include "content/child/appcache/appcache_dispatcher.h"
  38 #include "content/child/appcache/appcache_frontend_impl.h"
  39 #include "content/child/child_discardable_shared_memory_manager.h"
  40 #include "content/child/child_gpu_memory_buffer_manager.h"
  41 #include "content/child/child_histogram_message_filter.h"
  42 #include "content/child/child_resource_message_filter.h"
  43 #include "content/child/child_shared_bitmap_manager.h"
  44 #include "content/child/content_child_helpers.h"
  45 #include "content/child/db_message_filter.h"
  46 #include "content/child/indexed_db/indexed_db_dispatcher.h"
  47 #include "content/child/indexed_db/indexed_db_message_filter.h"
  48 #include "content/child/npapi/npobject_util.h"
  49 #include "content/child/plugin_messages.h"
  50 #include "content/child/resource_dispatcher.h"
  51 #include "content/child/resource_scheduling_filter.h"
  52 #include "content/child/runtime_features.h"
  53 #include "content/child/thread_safe_sender.h"
  54 #include "content/child/web_database_observer_impl.h"
  55 #include "content/child/worker_task_runner.h"
  56 #include "content/common/child_process_messages.h"
  57 #include "content/common/content_constants_internal.h"
  58 #include "content/common/database_messages.h"
  59 #include "content/common/dom_storage/dom_storage_messages.h"
  60 #include "content/common/frame_messages.h"
  61 #include "content/common/gpu/client/context_provider_command_buffer.h"
  62 #include "content/common/gpu/client/gpu_channel_host.h"
  63 #include "content/common/gpu/gpu_messages.h"
  64 #include "content/common/gpu/gpu_process_launch_causes.h"
  65 #include "content/common/render_frame_setup.mojom.h"
  66 #include "content/common/resource_messages.h"
  67 #include "content/common/view_messages.h"
  68 #include "content/common/worker_messages.h"
  69 #include "content/public/common/content_constants.h"
  70 #include "content/public/common/content_paths.h"
  71 #include "content/public/common/content_switches.h"
  72 #include "content/public/common/mojo_channel_switches.h"
  73 #include "content/public/common/renderer_preferences.h"
  74 #include "content/public/common/url_constants.h"
  75 #include "content/public/renderer/content_renderer_client.h"
  76 #include "content/public/renderer/render_process_observer.h"
  77 #include "content/public/renderer/render_view_visitor.h"
  78 #include "content/renderer/browser_plugin/browser_plugin_manager.h"
  79 #include "content/renderer/devtools/devtools_agent_filter.h"
  80 #include "content/renderer/devtools/v8_sampling_profiler.h"
  81 #include "content/renderer/dom_storage/dom_storage_dispatcher.h"
  82 #include "content/renderer/dom_storage/webstoragearea_impl.h"
  83 #include "content/renderer/dom_storage/webstoragenamespace_impl.h"
  84 #include "content/renderer/gpu/compositor_external_begin_frame_source.h"
  85 #include "content/renderer/gpu/compositor_forwarding_message_filter.h"
  86 #include "content/renderer/gpu/compositor_output_surface.h"
  87 #include "content/renderer/input/input_event_filter.h"
  88 #include "content/renderer/input/input_handler_manager.h"
  89 #include "content/renderer/input/main_thread_input_event_filter.h"
  90 #include "content/renderer/media/aec_dump_message_filter.h"
  91 #include "content/renderer/media/audio_input_message_filter.h"
  92 #include "content/renderer/media/audio_message_filter.h"
  93 #include "content/renderer/media/audio_renderer_mixer_manager.h"
  94 #include "content/renderer/media/media_stream_center.h"
  95 #include "content/renderer/media/midi_message_filter.h"
  96 #include "content/renderer/media/render_media_client.h"
  97 #include "content/renderer/media/renderer_gpu_video_accelerator_factories.h"
  98 #include "content/renderer/media/video_capture_impl_manager.h"
  99 #include "content/renderer/media/video_capture_message_filter.h"
 100 #include "content/renderer/net_info_helper.h"
 101 #include "content/renderer/p2p/socket_dispatcher.h"
 102 #include "content/renderer/render_frame_proxy.h"
 103 #include "content/renderer/render_process_impl.h"
 104 #include "content/renderer/render_view_impl.h"
 105 #include "content/renderer/renderer_blink_platform_impl.h"
 106 #include "content/renderer/scheduler/renderer_scheduler.h"
 107 #include "content/renderer/scheduler/resource_dispatch_throttler.h"
 108 #include "content/renderer/service_worker/embedded_worker_context_message_filter.h"
 109 #include "content/renderer/service_worker/embedded_worker_dispatcher.h"
 110 #include "content/renderer/shared_worker/embedded_shared_worker_stub.h"
 111 #include "gin/public/debug.h"
 112 #include "gpu/GLES2/gl2extchromium.h"
 113 #include "gpu/command_buffer/common/gles2_cmd_utils.h"
 114 #include "ipc/ipc_channel_handle.h"
 115 #include "ipc/ipc_platform_file.h"
 116 #include "ipc/mojo/ipc_channel_mojo.h"
 117 #include "media/base/audio_hardware_config.h"
 118 #include "media/base/media.h"
 119 #include "media/renderers/gpu_video_accelerator_factories.h"
 120 #include "mojo/common/common_type_converters.h"
 121 #include "net/base/net_errors.h"
 122 #include "net/base/net_util.h"
 123 #include "skia/ext/event_tracer_impl.h"
 124 #include "third_party/WebKit/public/platform/WebString.h"
 125 #include "third_party/WebKit/public/platform/WebThread.h"
 126 #include "third_party/WebKit/public/web/WebCache.h"
 127 #include "third_party/WebKit/public/web/WebColorName.h"
 128 #include "third_party/WebKit/public/web/WebDatabase.h"
 129 #include "third_party/WebKit/public/web/WebDocument.h"
 130 #include "third_party/WebKit/public/web/WebFrame.h"
 131 #include "third_party/WebKit/public/web/WebImageCache.h"
 132 #include "third_party/WebKit/public/web/WebKit.h"
 133 #include "third_party/WebKit/public/web/WebNetworkStateNotifier.h"
 134 #include "third_party/WebKit/public/web/WebPopupMenu.h"
 135 #include "third_party/WebKit/public/web/WebRuntimeFeatures.h"
 136 #include "third_party/WebKit/public/web/WebScriptController.h"
 137 #include "third_party/WebKit/public/web/WebSecurityPolicy.h"
 138 #include "third_party/WebKit/public/web/WebView.h"
 139 #include "third_party/skia/include/core/SkGraphics.h"
 140 #include "ui/base/layout.h"
 141 #include "ui/base/ui_base_switches.h"
 142 #include "v8/include/v8.h"
 143
 144 #if defined(OS_ANDROID)
 145 #include <cpu-features.h>
 146 #include "content/renderer/android/synchronous_compositor_factory.h"
 147 #include "content/renderer/media/android/renderer_demuxer_android.h"
 148 #endif
 149
 150 #if defined(OS_MACOSX)
 151 #include "base/mac/mac_util.h"
 152 #include "content/renderer/webscrollbarbehavior_impl_mac.h"
 153 #endif
 154
 155 #if defined(OS_POSIX)
 156 #include "ipc/ipc_channel_posix.h"
 157 #endif
 158
 159 #if defined(OS_WIN)
 160 #include <windows.h>
 161 #include <objbase.h>
 162 #else
 163 // TODO(port)
 164 #include "content/child/npapi/np_channel_base.h"
 165 #endif
 166
 167 #if defined(ENABLE_PLUGINS)
 168 #include "content/renderer/npapi/plugin_channel_host.h"
 169 #endif
 170
 171 #if defined(ENABLE_WEBRTC)
 172 #include "content/renderer/media/peer_connection_tracker.h"
 173 #include "content/renderer/media/rtc_peer_connection_handler.h"
 174 #include "content/renderer/media/webrtc/peer_connection_dependency_factory.h"
 175 #include "content/renderer/media/webrtc_identity_service.h"
 176 #endif
 177
 178 #ifdef ENABLE_VTUNE_JIT_INTERFACE
 179 #include "v8/src/third_party/vtune/v8-vtune.h"
 180 #endif
 181
 182 using base::ThreadRestrictions;
 183 using blink::WebDocument;
 184 using blink::WebFrame;
 185 using blink::WebNetworkStateNotifier;
 186 using blink::WebRuntimeFeatures;
 187 using blink::WebScriptController;
 188 using blink::WebSecurityPolicy;
 189 using blink::WebString;
 190 using blink::WebView;
 191
 192 namespace content {
 193
 194 namespace {
 195
 196 const int64 kInitialIdleHandlerDelayMs = 1000;
 197 const int64 kLongIdleHandlerDelayMs = 30*1000;
 198
 199 #if defined(OS_ANDROID)
 200 // On Android, resource messages can each take ~1.5ms to dispatch on the browser
 201 // IO thread. Limiting the message rate to 3/frame at 60hz ensures that the
 202 // induced work takes but a fraction (~1/4) of the overall frame budget.
 203 const int kMaxResourceRequestsPerFlushWhenThrottled = 3;
 204 #else
 205 const int kMaxResourceRequestsPerFlushWhenThrottled = 8;
 206 #endif
 207 const double kThrottledResourceRequestFlushPeriodS = 1. / 60.;
 208
 209 // Maximum allocation size allowed for image scaling filters that
 210 // require pre-scaling. Skia will fallback to a filter that doesn't
 211 // require pre-scaling if the default filter would require an
 212 // allocation that exceeds this limit.
 213 const size_t kImageCacheSingleAllocationByteLimit = 64 * 1024 * 1024;
 214
 215 const size_t kEmulatedDiscardableMemoryBytesToKeepWhenWidgetsHidden =
 216     4 * 1024 * 1024;
 217
 218 // Keep the global RenderThreadImpl in a TLS slot so it is impossible to access
 219 // incorrectly from the wrong thread.
 220 base::LazyInstance<base::ThreadLocalPointer<RenderThreadImpl> >
 221     lazy_tls = LAZY_INSTANCE_INITIALIZER;
 222
 223 class RenderViewZoomer : public RenderViewVisitor {
 224  public:
 225   RenderViewZoomer(const std::string& scheme,
 226                    const std::string& host,
 227                    double zoom_level) : scheme_(scheme),
 228                                         host_(host),
 229                                         zoom_level_(zoom_level) {
 230   }
 231
 232   bool Visit(RenderView* render_view) override {
 233     WebView* webview = render_view->GetWebView();
 234     WebDocument document = webview->mainFrame()->document();
 235
 236     // Don't set zoom level for full-page plugin since they don't use the same
 237     // zoom settings.
 238     if (document.isPluginDocument())
 239       return true;
 240     GURL url(document.url());
 241     // Empty scheme works as wildcard that matches any scheme,
 242     if ((net::GetHostOrSpecFromURL(url) == host_) &&
 243         (scheme_.empty() || scheme_ == url.scheme()) &&
 244         !static_cast<RenderViewImpl*>(render_view)
 245              ->uses_temporary_zoom_level()) {
 246       webview->hidePopups();
 247       webview->setZoomLevel(zoom_level_);
 248     }
 249     return true;
 250   }
 251
 252  private:
 253   const std::string scheme_;
 254   const std::string host_;
 255   const double zoom_level_;
 256
 257   DISALLOW_COPY_AND_ASSIGN(RenderViewZoomer);
 258 };
 259
 260 std::string HostToCustomHistogramSuffix(const std::string& host) {
 261   if (host == "mail.google.com")
 262     return ".gmail";
 263   if (host == "docs.google.com" || host == "drive.google.com")
 264     return ".docs";
 265   if (host == "plus.google.com")
 266     return ".plus";
 267   return std::string();
 268 }
 269
 270 void* CreateHistogram(
 271     const char *name, int min, int max, size_t buckets) {
 272   if (min <= 0)
 273     min = 1;
 274   std::string histogram_name;
 275   RenderThreadImpl* render_thread_impl = RenderThreadImpl::current();
 276   if (render_thread_impl) {  // Can be null in tests.
 277     histogram_name = render_thread_impl->
 278         histogram_customizer()->ConvertToCustomHistogramName(name);
 279   } else {
 280     histogram_name = std::string(name);
 281   }
 282   base::HistogramBase* histogram = base::Histogram::FactoryGet(
 283       histogram_name, min, max, buckets,
 284       base::Histogram::kUmaTargetedHistogramFlag);
 285   return histogram;
 286 }
 287
 288 void AddHistogramSample(void* hist, int sample) {
 289   base::Histogram* histogram = static_cast<base::Histogram*>(hist);
 290   histogram->Add(sample);
 291 }
 292
 293 scoped_ptr<cc::SharedBitmap> AllocateSharedBitmapFunction(
 294     const gfx::Size& size) {
 295   return ChildThreadImpl::current()->shared_bitmap_manager()->
 296       AllocateSharedBitmap(size);
 297 }
 298
 299 void EnableBlinkPlatformLogChannels(const std::string& channels) {
 300   if (channels.empty())
 301     return;
 302   base::StringTokenizer t(channels, ", ");
 303   while (t.GetNext())
 304     blink::enableLogChannel(t.token().c_str());
 305 }
 306
 307 void NotifyTimezoneChangeOnThisThread() {
 308   v8::Isolate* isolate = v8::Isolate::GetCurrent();
 309   if (!isolate)
 310     return;
 311   v8::Date::DateTimeConfigurationChangeNotification(isolate);
 312 }
 313
 314 void LowMemoryNotificationOnThisThread() {
 315   v8::Isolate* isolate = v8::Isolate::GetCurrent();
 316   if (!isolate)
 317     return;
 318   isolate->LowMemoryNotification();
 319 }
 320
 321 class RenderFrameSetupImpl : public mojo::InterfaceImpl<RenderFrameSetup> {
 322  public:
 323   RenderFrameSetupImpl()
 324       : routing_id_highmark_(-1) {
 325   }
 326
 327   void ExchangeServiceProviders(
 328       int32_t frame_routing_id,
 329       mojo::InterfaceRequest<mojo::ServiceProvider> services,
 330       mojo::ServiceProviderPtr exposed_services)
 331       override {
 332     // TODO(morrita): This is for investigating http://crbug.com/415059 and
 333     // should be removed once it is fixed.
 334     CHECK_LT(routing_id_highmark_, frame_routing_id);
 335     routing_id_highmark_ = frame_routing_id;
 336
 337     RenderFrameImpl* frame = RenderFrameImpl::FromRoutingID(frame_routing_id);
 338     // We can receive a GetServiceProviderForFrame message for a frame not yet
 339     // created due to a race between the message and a ViewMsg_New IPC that
 340     // triggers creation of the RenderFrame we want.
 341     if (!frame) {
 342       RenderThreadImpl::current()->RegisterPendingRenderFrameConnect(
 343           frame_routing_id, services.Pass(), exposed_services.Pass());
 344       return;
 345     }
 346
 347     frame->BindServiceRegistry(services.Pass(), exposed_services.Pass());
 348   }
 349
 350  private:
 351   int32_t routing_id_highmark_;
 352 };
 353
 354 void CreateRenderFrameSetup(mojo::InterfaceRequest<RenderFrameSetup> request) {
 355   mojo::BindToRequest(new RenderFrameSetupImpl(), &request);
 356 }
 357
 358 blink::WebGraphicsContext3D::Attributes GetOffscreenAttribs() {
 359   blink::WebGraphicsContext3D::Attributes attributes;
 360   attributes.shareResources = true;
 361   attributes.depth = false;
 362   attributes.stencil = false;
 363   attributes.antialias = false;
 364   attributes.noAutomaticFlushes = true;
 365   return attributes;
 366 }
 367
 368 }  // namespace
 369
 370 // For measuring memory usage after each task. Behind a command line flag.
 371 class MemoryObserver : public base::MessageLoop::TaskObserver {
 372  public:
 373   MemoryObserver() {}
 374   ~MemoryObserver() override {}
 375
 376   void WillProcessTask(const base::PendingTask& pending_task) override {}
 377
 378   void DidProcessTask(const base::PendingTask& pending_task) override {
 379     LOCAL_HISTOGRAM_MEMORY_KB("Memory.RendererUsed", GetMemoryUsageKB());
 380   }
 381
 382  private:
 383   DISALLOW_COPY_AND_ASSIGN(MemoryObserver);
 384 };
 385
 386 RenderThreadImpl::HistogramCustomizer::HistogramCustomizer() {
 387   custom_histograms_.insert("V8.MemoryExternalFragmentationTotal");
 388   custom_histograms_.insert("V8.MemoryHeapSampleTotalCommitted");
 389   custom_histograms_.insert("V8.MemoryHeapSampleTotalUsed");
 390 }
 391
 392 RenderThreadImpl::HistogramCustomizer::~HistogramCustomizer() {}
 393
 394 void RenderThreadImpl::HistogramCustomizer::RenderViewNavigatedToHost(
 395     const std::string& host, size_t view_count) {
 396   if (base::CommandLine::ForCurrentProcess()->HasSwitch(
 397           switches::kDisableHistogramCustomizer)) {
 398     return;
 399   }
 400   // Check if all RenderViews are displaying a page from the same host. If there
 401   // is only one RenderView, the common host is this view's host. If there are
 402   // many, check if this one shares the common host of the other
 403   // RenderViews. It's ok to not detect some cases where the RenderViews share a
 404   // common host. This information is only used for producing custom histograms.
 405   if (view_count == 1)
 406     SetCommonHost(host);
 407   else if (host != common_host_)
 408     SetCommonHost(std::string());
 409 }
 410
 411 std::string RenderThreadImpl::HistogramCustomizer::ConvertToCustomHistogramName(
 412     const char* histogram_name) const {
 413   std::string name(histogram_name);
 414   if (!common_host_histogram_suffix_.empty() &&
 415       custom_histograms_.find(name) != custom_histograms_.end())
 416     name += common_host_histogram_suffix_;
 417   return name;
 418 }
 419
 420 void RenderThreadImpl::HistogramCustomizer::SetCommonHost(
 421     const std::string& host) {
 422   if (host != common_host_) {
 423     common_host_ = host;
 424     common_host_histogram_suffix_ = HostToCustomHistogramSuffix(host);
 425     blink::mainThreadIsolate()->SetCreateHistogramFunction(CreateHistogram);
 426   }
 427 }
 428
 429 RenderThreadImpl* RenderThreadImpl::current() {
 430   return lazy_tls.Pointer()->Get();
 431 }
 432
 433 // When we run plugins in process, we actually run them on the render thread,
 434 // which means that we need to make the render thread pump UI events.
 435 RenderThreadImpl::RenderThreadImpl()
 436     : ChildThreadImpl(Options(ShouldUseMojoChannel())) {
 437   Init();
 438 }
 439
 440 RenderThreadImpl::RenderThreadImpl(const std::string& channel_name)
 441     : ChildThreadImpl(Options(channel_name, ShouldUseMojoChannel())) {
 442   Init();
 443 }
 444
 445 RenderThreadImpl::RenderThreadImpl(
 446     scoped_ptr<base::MessageLoop> main_message_loop)
 447     : ChildThreadImpl(Options(ShouldUseMojoChannel())),
 448       main_message_loop_(main_message_loop.Pass()) {
 449   Init();
 450 }
 451
 452 void RenderThreadImpl::Init() {
 453   TRACE_EVENT_BEGIN_ETW("RenderThreadImpl::Init", 0, "");
 454
 455   base::trace_event::TraceLog::GetInstance()->SetThreadSortIndex(
 456       base::PlatformThread::CurrentId(),
 457       kTraceEventRendererMainThreadSortIndex);
 458
 459 #if defined(OS_MACOSX) || defined(OS_ANDROID)
 460   // On Mac and Android, the select popups are rendered by the browser.
 461   blink::WebView::setUseExternalPopupMenus(true);
 462 #endif
 463
 464   lazy_tls.Pointer()->Set(this);
 465
 466   // Register this object as the main thread.
 467   ChildProcess::current()->set_main_thread(this);
 468
 469   // In single process the single process is all there is.
 470   suspend_webkit_shared_timer_ = true;
 471   notify_webkit_of_modal_loop_ = true;
 472   webkit_shared_timer_suspended_ = false;
 473   widget_count_ = 0;
 474   hidden_widget_count_ = 0;
 475   idle_notification_delay_in_ms_ = kInitialIdleHandlerDelayMs;
 476   idle_notifications_to_skip_ = 0;
 477   layout_test_mode_ = false;
 478
 479   appcache_dispatcher_.reset(
 480       new AppCacheDispatcher(Get(), new AppCacheFrontendImpl()));
 481   dom_storage_dispatcher_.reset(new DomStorageDispatcher());
 482   main_thread_indexed_db_dispatcher_.reset(new IndexedDBDispatcher(
 483       thread_safe_sender()));
 484   renderer_scheduler_ = RendererScheduler::Create();
 485   channel()->SetListenerTaskRunner(renderer_scheduler_->DefaultTaskRunner());
 486   embedded_worker_dispatcher_.reset(new EmbeddedWorkerDispatcher());
 487
 488   // Note: This may reorder messages from the ResourceDispatcher with respect to
 489   // other subsystems.
 490   resource_dispatch_throttler_.reset(new ResourceDispatchThrottler(
 491       static_cast<RenderThread*>(this), renderer_scheduler_.get(),
 492       base::TimeDelta::FromSecondsD(kThrottledResourceRequestFlushPeriodS),
 493       kMaxResourceRequestsPerFlushWhenThrottled));
 494   resource_dispatcher()->set_message_sender(resource_dispatch_throttler_.get());
 495
 496   media_stream_center_ = NULL;
 497
 498   db_message_filter_ = new DBMessageFilter();
 499   AddFilter(db_message_filter_.get());
 500
 501   vc_manager_.reset(new VideoCaptureImplManager());
 502   AddFilter(vc_manager_->video_capture_message_filter());
 503
 504   browser_plugin_manager_.reset(new BrowserPluginManager());
 505   AddObserver(browser_plugin_manager_.get());
 506
 507 #if defined(ENABLE_WEBRTC)
 508   peer_connection_tracker_.reset(new PeerConnectionTracker());
 509   AddObserver(peer_connection_tracker_.get());
 510
 511   p2p_socket_dispatcher_ =
 512       new P2PSocketDispatcher(GetIOMessageLoopProxy().get());
 513   AddFilter(p2p_socket_dispatcher_.get());
 514
 515   webrtc_identity_service_.reset(new WebRTCIdentityService());
 516
 517   aec_dump_message_filter_ =
 518       new AecDumpMessageFilter(GetIOMessageLoopProxy(),
 519                                message_loop()->message_loop_proxy());
 520   AddFilter(aec_dump_message_filter_.get());
 521
 522   peer_connection_factory_.reset(new PeerConnectionDependencyFactory(
 523       p2p_socket_dispatcher_.get()));
 524 #endif  // defined(ENABLE_WEBRTC)
 525
 526   audio_input_message_filter_ =
 527       new AudioInputMessageFilter(GetIOMessageLoopProxy());
 528   AddFilter(audio_input_message_filter_.get());
 529
 530   audio_message_filter_ = new AudioMessageFilter(GetIOMessageLoopProxy());
 531   AddFilter(audio_message_filter_.get());
 532
 533   midi_message_filter_ = new MidiMessageFilter(GetIOMessageLoopProxy());
 534   AddFilter(midi_message_filter_.get());
 535
 536   AddFilter((new IndexedDBMessageFilter(thread_safe_sender()))->GetFilter());
 537
 538   AddFilter((new EmbeddedWorkerContextMessageFilter())->GetFilter());
 539
 540   GetContentClient()->renderer()->RenderThreadStarted();
 541
 542   InitSkiaEventTracer();
 543
 544   const base::CommandLine& command_line =
 545       *base::CommandLine::ForCurrentProcess();
 546
 547   is_impl_side_painting_enabled_ =
 548       !command_line.HasSwitch(switches::kDisableImplSidePainting);
 549   cc_blink::WebLayerImpl::SetImplSidePaintingEnabled(
 550       is_impl_side_painting_enabled_);
 551
 552   is_zero_copy_enabled_ = command_line.HasSwitch(switches::kEnableZeroCopy);
 553   is_one_copy_enabled_ = !command_line.HasSwitch(switches::kDisableOneCopy);
 554
 555 #if defined(OS_MACOSX) && !defined(OS_IOS)
 556   is_elastic_overscroll_enabled_ =
 557       !base::CommandLine::ForCurrentProcess()->HasSwitch(
 558           switches::kDisableThreadedEventHandlingMac) &&
 559       base::mac::IsOSLionOrLater();
 560   if (is_elastic_overscroll_enabled_) {
 561     base::ScopedCFTypeRef<CFStringRef> key(
 562         base::SysUTF8ToCFStringRef("NSScrollViewRubberbanding"));
 563     Boolean key_exists = false;
 564     Boolean value = CFPreferencesGetAppBooleanValue(
 565         key, kCFPreferencesCurrentApplication, &key_exists);
 566     if (key_exists && !value)
 567       is_elastic_overscroll_enabled_ = false;
 568   }
 569 #else
 570   is_elastic_overscroll_enabled_ = false;
 571 #endif
 572
 573   std::string image_texture_target_string =
 574       command_line.GetSwitchValueASCII(switches::kUseImageTextureTarget);
 575   bool parsed_image_texture_target = base::StringToUint(
 576       image_texture_target_string, &use_image_texture_target_);
 577   DCHECK(parsed_image_texture_target);
 578
 579   if (command_line.HasSwitch(switches::kDisableLCDText)) {
 580     is_lcd_text_enabled_ = false;
 581   } else if (command_line.HasSwitch(switches::kEnableLCDText)) {
 582     is_lcd_text_enabled_ = true;
 583   } else {
 584 #if defined(OS_ANDROID)
 585     is_lcd_text_enabled_ = false;
 586 #else
 587     is_lcd_text_enabled_ = true;
 588 #endif
 589   }
 590
 591   is_gpu_rasterization_enabled_ =
 592       command_line.HasSwitch(switches::kEnableGpuRasterization);
 593   is_gpu_rasterization_forced_ =
 594       command_line.HasSwitch(switches::kForceGpuRasterization);
 595
 596   if (command_line.HasSwitch(switches::kGpuRasterizationMSAASampleCount)) {
 597     std::string string_value = command_line.GetSwitchValueASCII(
 598         switches::kGpuRasterizationMSAASampleCount);
 599     bool parsed_msaa_sample_count =
 600         base::StringToInt(string_value, &gpu_rasterization_msaa_sample_count_);
 601     DCHECK(parsed_msaa_sample_count) << string_value;
 602     DCHECK_GE(gpu_rasterization_msaa_sample_count_, 0);
 603   } else {
 604     gpu_rasterization_msaa_sample_count_ = 0;
 605   }
 606   is_threaded_gpu_rasterization_enabled_ =
 607       command_line.HasSwitch(switches::kEnableThreadedGpuRasterization);
 608
 609   if (command_line.HasSwitch(switches::kDisableDistanceFieldText)) {
 610     is_distance_field_text_enabled_ = false;
 611   } else if (command_line.HasSwitch(switches::kEnableDistanceFieldText)) {
 612     is_distance_field_text_enabled_ = true;
 613   } else {
 614     is_distance_field_text_enabled_ = false;
 615   }
 616
 617   // Note that under Linux, the media library will normally already have
 618   // been initialized by the Zygote before this instance became a Renderer.
 619   base::FilePath media_path;
 620   PathService::Get(DIR_MEDIA_LIBS, &media_path);
 621   if (!media_path.empty())
 622     media::InitializeMediaLibrary(media_path);
 623
 624   memory_pressure_listener_.reset(new base::MemoryPressureListener(
 625       base::Bind(&RenderThreadImpl::OnMemoryPressure, base::Unretained(this))));
 626
 627   std::vector<base::DiscardableMemoryType> supported_types;
 628   base::DiscardableMemory::GetSupportedTypes(&supported_types);
 629   DCHECK(!supported_types.empty());
 630
 631   // The default preferred type is always the first one in list.
 632   base::DiscardableMemoryType type = supported_types[0];
 633
 634   if (command_line.HasSwitch(switches::kUseDiscardableMemory)) {
 635     std::string requested_type_name = command_line.GetSwitchValueASCII(
 636         switches::kUseDiscardableMemory);
 637     base::DiscardableMemoryType requested_type =
 638         base::DiscardableMemory::GetNamedType(requested_type_name);
 639     if (std::find(supported_types.begin(),
 640                   supported_types.end(),
 641                   requested_type) != supported_types.end()) {
 642       type = requested_type;
 643     } else {
 644       LOG(ERROR) << "Requested discardable memory type is not supported.";
 645     }
 646   }
 647
 648   base::DiscardableMemory::SetPreferredType(type);
 649
 650   if (is_impl_side_painting_enabled_) {
 651     int num_raster_threads = 0;
 652     std::string string_value =
 653         command_line.GetSwitchValueASCII(switches::kNumRasterThreads);
 654     bool parsed_num_raster_threads =
 655         base::StringToInt(string_value, &num_raster_threads);
 656     DCHECK(parsed_num_raster_threads) << string_value;
 657     DCHECK_GT(num_raster_threads, 0);
 658
 659     // Force maximum 1 thread for threaded GPU rasterization.
 660     // TODO(vmiura): crbug.com/459760 Support existence of multiple raster
 661     // threads in GPU raster mode.
 662     if (is_threaded_gpu_rasterization_enabled_)
 663       num_raster_threads = 1;
 664     cc::TileTaskWorkerPool::SetNumWorkerThreads(num_raster_threads);
 665
 666 #if defined(OS_ANDROID) || defined(OS_LINUX)
 667     if (!command_line.HasSwitch(
 668             switches::kUseNormalPriorityForTileTaskWorkerThreads)) {
 669       cc::TileTaskWorkerPool::SetWorkerThreadPriority(
 670           base::kThreadPriority_Background);
 671     }
 672 #endif
 673   }
 674
 675   base::DiscardableMemoryShmemAllocator::SetInstance(
 676       ChildThreadImpl::discardable_shared_memory_manager());
 677
 678   service_registry()->AddService<RenderFrameSetup>(
 679       base::Bind(CreateRenderFrameSetup));
 680
 681   TRACE_EVENT_END_ETW("RenderThreadImpl::Init", 0, "");
 682 }
 683
 684 RenderThreadImpl::~RenderThreadImpl() {
 685 }
 686
 687 void RenderThreadImpl::Shutdown() {
 688   FOR_EACH_OBSERVER(
 689       RenderProcessObserver, observers_, OnRenderProcessShutdown());
 690
 691   ChildThreadImpl::Shutdown();
 692
 693   if (memory_observer_) {
 694     message_loop()->RemoveTaskObserver(memory_observer_.get());
 695     memory_observer_.reset();
 696   }
 697
 698   // Wait for all databases to be closed.
 699   if (blink_platform_impl_) {
 700     // WaitForAllDatabasesToClose might run a nested message loop. To avoid
 701     // processing timer events while we're already in the process of shutting
 702     // down blink, put a ScopePageLoadDeferrer on the stack.
 703     WebView::willEnterModalLoop();
 704     blink_platform_impl_->web_database_observer_impl()
 705         ->WaitForAllDatabasesToClose();
 706     WebView::didExitModalLoop();
 707   }
 708
 709   // Shutdown in reverse of the initialization order.
 710   if (devtools_agent_message_filter_.get()) {
 711     RemoveFilter(devtools_agent_message_filter_.get());
 712     devtools_agent_message_filter_ = NULL;
 713   }
 714
 715   RemoveFilter(audio_input_message_filter_.get());
 716   audio_input_message_filter_ = NULL;
 717
 718 #if defined(ENABLE_WEBRTC)
 719   RTCPeerConnectionHandler::DestructAllHandlers();
 720   // |peer_connection_factory_| cannot be deleted until after the main message
 721   // loop has been destroyed.  This is because there may be pending tasks that
 722   // hold on to objects produced by the PC factory that depend on threads owned
 723   // by the PC factory.  Once those tasks have been freed, the factory can be
 724   // deleted.
 725 #endif
 726   RemoveFilter(vc_manager_->video_capture_message_filter());
 727   vc_manager_.reset();
 728
 729   RemoveFilter(db_message_filter_.get());
 730   db_message_filter_ = NULL;
 731
 732   // Shutdown the file thread if it's running.
 733   if (file_thread_)
 734     file_thread_->Stop();
 735
 736   if (compositor_message_filter_.get()) {
 737     RemoveFilter(compositor_message_filter_.get());
 738     compositor_message_filter_ = NULL;
 739   }
 740
 741   media_thread_.reset();
 742
 743   // AudioMessageFilter may be accessed on |media_thread_|, so shutdown after.
 744   RemoveFilter(audio_message_filter_.get());
 745   audio_message_filter_ = NULL;
 746
 747   compositor_thread_.reset();
 748
 749   main_input_callback_.Cancel();
 750   input_handler_manager_.reset();
 751   if (input_event_filter_.get()) {
 752     RemoveFilter(input_event_filter_.get());
 753     input_event_filter_ = NULL;
 754   }
 755
 756   // RemoveEmbeddedWorkerRoute may be called while deleting
 757   // EmbeddedWorkerDispatcher. So it must be deleted before deleting
 758   // RenderThreadImpl.
 759   embedded_worker_dispatcher_.reset();
 760
 761   // Ramp down IDB before we ramp down WebKit (and V8), since IDB classes might
 762   // hold pointers to V8 objects (e.g., via pending requests).
 763   main_thread_indexed_db_dispatcher_.reset();
 764
 765   main_thread_compositor_task_runner_ = NULL;
 766
 767   if (gpu_channel_.get())
 768     gpu_channel_->DestroyChannel();
 769
 770   // TODO(port)
 771 #if defined(OS_WIN)
 772   // Clean up plugin channels before this thread goes away.
 773   NPChannelBase::CleanupChannels();
 774 #endif
 775
 776   // Shut down the message loop before shutting down Blink.
 777   // This prevents a scenario where a pending task in the message loop accesses
 778   // Blink objects after Blink shuts down.
 779   // This must be at the very end of the shutdown sequence. You must not touch
 780   // the message loop after this.
 781   main_message_loop_.reset();
 782   if (blink_platform_impl_)
 783     blink::shutdown();
 784
 785   lazy_tls.Pointer()->Set(NULL);
 786 }
 787
 788 bool RenderThreadImpl::Send(IPC::Message* msg) {
 789   // Certain synchronous messages cannot always be processed synchronously by
 790   // the browser, e.g., putting up UI and waiting for the user. This could cause
 791   // a complete hang of Chrome if a windowed plug-in is trying to communicate
 792   // with the renderer thread since the browser's UI thread could be stuck
 793   // (within a Windows API call) trying to synchronously communicate with the
 794   // plug-in.  The remedy is to pump messages on this thread while the browser
 795   // is processing this request. This creates an opportunity for re-entrancy
 796   // into WebKit, so we need to take care to disable callbacks, timers, and
 797   // pending network loads that could trigger such callbacks.
 798   bool pumping_events = false;
 799   if (msg->is_sync()) {
 800     if (msg->is_caller_pumping_messages()) {
 801       pumping_events = true;
 802     }
 803   }
 804
 805   bool suspend_webkit_shared_timer = true;  // default value
 806   std::swap(suspend_webkit_shared_timer, suspend_webkit_shared_timer_);
 807
 808   bool notify_webkit_of_modal_loop = true;  // default value
 809   std::swap(notify_webkit_of_modal_loop, notify_webkit_of_modal_loop_);
 810
 811 #if defined(ENABLE_PLUGINS)
 812   int render_view_id = MSG_ROUTING_NONE;
 813 #endif
 814
 815   if (pumping_events) {
 816     if (suspend_webkit_shared_timer)
 817       blink_platform_impl_->SuspendSharedTimer();
 818
 819     if (notify_webkit_of_modal_loop)
 820       WebView::willEnterModalLoop();
 821 #if defined(ENABLE_PLUGINS)
 822     RenderViewImpl* render_view =
 823         RenderViewImpl::FromRoutingID(msg->routing_id());
 824     if (render_view) {
 825       render_view_id = msg->routing_id();
 826       PluginChannelHost::Broadcast(
 827           new PluginMsg_SignalModalDialogEvent(render_view_id));
 828     }
 829 #endif
 830   }
 831
 832   bool rv = ChildThreadImpl::Send(msg);
 833
 834   if (pumping_events) {
 835 #if defined(ENABLE_PLUGINS)
 836     if (render_view_id != MSG_ROUTING_NONE) {
 837       PluginChannelHost::Broadcast(
 838           new PluginMsg_ResetModalDialogEvent(render_view_id));
 839     }
 840 #endif
 841
 842     if (notify_webkit_of_modal_loop)
 843       WebView::didExitModalLoop();
 844
 845     if (suspend_webkit_shared_timer)
 846       blink_platform_impl_->ResumeSharedTimer();
 847   }
 848
 849   return rv;
 850 }
 851
 852 scoped_refptr<base::SingleThreadTaskRunner> RenderThreadImpl::GetTaskRunner() {
 853   return GetRendererScheduler()->DefaultTaskRunner();
 854 }
 855
 856 IPC::SyncChannel* RenderThreadImpl::GetChannel() {
 857   return channel();
 858 }
 859
 860 std::string RenderThreadImpl::GetLocale() {
 861   // The browser process should have passed the locale to the renderer via the
 862   // --lang command line flag.
 863   const base::CommandLine& parsed_command_line =
 864       *base::CommandLine::ForCurrentProcess();
 865   const std::string& lang =
 866       parsed_command_line.GetSwitchValueASCII(switches::kLang);
 867   DCHECK(!lang.empty());
 868   return lang;
 869 }
 870
 871 IPC::SyncMessageFilter* RenderThreadImpl::GetSyncMessageFilter() {
 872   return sync_message_filter();
 873 }
 874
 875 scoped_refptr<base::MessageLoopProxy>
 876     RenderThreadImpl::GetIOMessageLoopProxy() {
 877   return ChildProcess::current()->io_message_loop_proxy();
 878 }
 879
 880 void RenderThreadImpl::AddRoute(int32 routing_id, IPC::Listener* listener) {
 881   ChildThreadImpl::GetRouter()->AddRoute(routing_id, listener);
 882   PendingRenderFrameConnectMap::iterator it =
 883       pending_render_frame_connects_.find(routing_id);
 884   if (it == pending_render_frame_connects_.end())
 885     return;
 886
 887   RenderFrameImpl* frame = RenderFrameImpl::FromRoutingID(routing_id);
 888   if (!frame)
 889     return;
 890
 891   scoped_refptr<PendingRenderFrameConnect> connection(it->second);
 892   mojo::InterfaceRequest<mojo::ServiceProvider> services(
 893       connection->services.Pass());
 894   mojo::ServiceProviderPtr exposed_services(
 895       connection->exposed_services.Pass());
 896   pending_render_frame_connects_.erase(it);
 897
 898   frame->BindServiceRegistry(services.Pass(), exposed_services.Pass());
 899 }
 900
 901 void RenderThreadImpl::RemoveRoute(int32 routing_id) {
 902   ChildThreadImpl::GetRouter()->RemoveRoute(routing_id);
 903 }
 904
 905 void RenderThreadImpl::AddEmbeddedWorkerRoute(int32 routing_id,
 906                                               IPC::Listener* listener) {
 907   AddRoute(routing_id, listener);
 908   if (devtools_agent_message_filter_.get()) {
 909     devtools_agent_message_filter_->AddEmbeddedWorkerRouteOnMainThread(
 910         routing_id);
 911   }
 912 }
 913
 914 void RenderThreadImpl::RemoveEmbeddedWorkerRoute(int32 routing_id) {
 915   RemoveRoute(routing_id);
 916   if (devtools_agent_message_filter_.get()) {
 917     devtools_agent_message_filter_->RemoveEmbeddedWorkerRouteOnMainThread(
 918         routing_id);
 919   }
 920 }
 921
 922 void RenderThreadImpl::RegisterPendingRenderFrameConnect(
 923     int routing_id,
 924     mojo::InterfaceRequest<mojo::ServiceProvider> services,
 925     mojo::ServiceProviderPtr exposed_services) {
 926   std::pair<PendingRenderFrameConnectMap::iterator, bool> result =
 927       pending_render_frame_connects_.insert(std::make_pair(
 928           routing_id,
 929           make_scoped_refptr(new PendingRenderFrameConnect(
 930               services.Pass(),
 931               exposed_services.Pass()))));
 932   CHECK(result.second) << "Inserting a duplicate item.";
 933 }
 934
 935 int RenderThreadImpl::GenerateRoutingID() {
 936   int routing_id = MSG_ROUTING_NONE;
 937   Send(new ViewHostMsg_GenerateRoutingID(&routing_id));
 938   return routing_id;
 939 }
 940
 941 void RenderThreadImpl::AddFilter(IPC::MessageFilter* filter) {
 942   channel()->AddFilter(filter);
 943 }
 944
 945 void RenderThreadImpl::RemoveFilter(IPC::MessageFilter* filter) {
 946   channel()->RemoveFilter(filter);
 947 }
 948
 949 void RenderThreadImpl::AddObserver(RenderProcessObserver* observer) {
 950   observers_.AddObserver(observer);
 951 }
 952
 953 void RenderThreadImpl::RemoveObserver(RenderProcessObserver* observer) {
 954   observers_.RemoveObserver(observer);
 955 }
 956
 957 void RenderThreadImpl::SetResourceDispatcherDelegate(
 958     ResourceDispatcherDelegate* delegate) {
 959   resource_dispatcher()->set_delegate(delegate);
 960 }
 961
 962 void RenderThreadImpl::SetResourceDispatchTaskQueue(
 963     const scoped_refptr<base::SingleThreadTaskRunner>& resource_task_queue) {
 964   // Add a filter that forces resource messages to be dispatched via a
 965   // particular task runner.
 966   resource_scheduling_filter_ =
 967       new ResourceSchedulingFilter(resource_task_queue, resource_dispatcher());
 968   channel()->AddFilter(resource_scheduling_filter_.get());
 969
 970   // The ChildResourceMessageFilter and the ResourceDispatcher need to use the
 971   // same queue to ensure tasks are executed in the expected order.
 972   child_resource_message_filter()->SetMainThreadTaskRunner(resource_task_queue);
 973   resource_dispatcher()->SetMainThreadTaskRunner(resource_task_queue);
 974 }
 975
 976 void RenderThreadImpl::EnsureWebKitInitialized() {
 977   if (blink_platform_impl_)
 978     return;
 979
 980   const base::CommandLine& command_line =
 981       *base::CommandLine::ForCurrentProcess();
 982
 983 #ifdef ENABLE_VTUNE_JIT_INTERFACE
 984   if (command_line.HasSwitch(switches::kEnableVtune))
 985     gin::Debug::SetJitCodeEventHandler(vTune::GetVtuneCodeEventHandler());
 986 #endif
 987
 988   SetRuntimeFeaturesDefaultsAndUpdateFromArgs(command_line);
 989
 990   blink_platform_impl_.reset(
 991       new RendererBlinkPlatformImpl(renderer_scheduler_.get()));
 992   blink::initialize(blink_platform_impl_.get());
 993
 994   v8::Isolate* isolate = blink::mainThreadIsolate();
 995   isolate->SetCreateHistogramFunction(CreateHistogram);
 996   isolate->SetAddHistogramSampleFunction(AddHistogramSample);
 997
 998   main_thread_compositor_task_runner_ =
 999       renderer_scheduler_->CompositorTaskRunner();
1000
1001   main_input_callback_.Reset(
1002       base::Bind(base::IgnoreResult(&RenderThreadImpl::OnMessageReceived),
1003                  base::Unretained(this)));
1004
1005   SetResourceDispatchTaskQueue(renderer_scheduler_->LoadingTaskRunner());
1006
1007   bool enable = !command_line.HasSwitch(switches::kDisableThreadedCompositing);
1008   if (enable) {
1009 #if defined(OS_ANDROID)
1010     if (SynchronousCompositorFactory* factory =
1011         SynchronousCompositorFactory::GetInstance())
1012       compositor_message_loop_proxy_ =
1013           factory->GetCompositorMessageLoop();
1014 #endif
1015     if (!compositor_message_loop_proxy_.get()) {
1016       compositor_thread_.reset(new base::Thread("Compositor"));
1017       compositor_thread_->Start();
1018 #if defined(OS_ANDROID)
1019       compositor_thread_->SetPriority(base::kThreadPriority_Display);
1020 #endif
1021       compositor_message_loop_proxy_ =
1022           compositor_thread_->message_loop_proxy();
1023       compositor_message_loop_proxy_->PostTask(
1024           FROM_HERE,
1025           base::Bind(base::IgnoreResult(&ThreadRestrictions::SetIOAllowed),
1026                      false));
1027     }
1028
1029     InputHandlerManagerClient* input_handler_manager_client = NULL;
1030 #if defined(OS_ANDROID)
1031     if (SynchronousCompositorFactory* factory =
1032         SynchronousCompositorFactory::GetInstance()) {
1033       input_handler_manager_client = factory->GetInputHandlerManagerClient();
1034     }
1035 #endif
1036     if (!input_handler_manager_client) {
1037       scoped_refptr<InputEventFilter> compositor_input_event_filter(
1038           new InputEventFilter(main_input_callback_.callback(),
1039                                main_thread_compositor_task_runner_,
1040                                compositor_message_loop_proxy_));
1041       input_handler_manager_client = compositor_input_event_filter.get();
1042       input_event_filter_ = compositor_input_event_filter;
1043     }
1044     input_handler_manager_.reset(new InputHandlerManager(
1045         compositor_message_loop_proxy_, input_handler_manager_client,
1046         renderer_scheduler_.get()));
1047   }
1048
1049   if (!input_event_filter_.get()) {
1050     // Always provide an input event filter implementation to ensure consistent
1051     // input event scheduling and prioritization.
1052     // TODO(jdduke): Merge InputEventFilter, InputHandlerManager and
1053     // MainThreadInputEventFilter, crbug.com/436057.
1054     input_event_filter_ = new MainThreadInputEventFilter(
1055         main_input_callback_.callback(), main_thread_compositor_task_runner_);
1056   }
1057   AddFilter(input_event_filter_.get());
1058
1059   scoped_refptr<base::MessageLoopProxy> compositor_impl_side_loop;
1060   if (enable)
1061     compositor_impl_side_loop = compositor_message_loop_proxy_;
1062   else
1063     compositor_impl_side_loop = base::MessageLoopProxy::current();
1064
1065   compositor_message_filter_ = new CompositorForwardingMessageFilter(
1066       compositor_impl_side_loop.get());
1067   AddFilter(compositor_message_filter_.get());
1068
1069   RenderThreadImpl::RegisterSchemes();
1070
1071   EnableBlinkPlatformLogChannels(
1072       command_line.GetSwitchValueASCII(switches::kBlinkPlatformLogChannels));
1073
1074   if (!media::IsMediaLibraryInitialized()) {
1075     WebRuntimeFeatures::enableWebAudio(false);
1076   }
1077
1078   RenderMediaClient::Initialize();
1079
1080   FOR_EACH_OBSERVER(RenderProcessObserver, observers_, WebKitInitialized());
1081
1082   devtools_agent_message_filter_ = new DevToolsAgentFilter();
1083   AddFilter(devtools_agent_message_filter_.get());
1084
1085   v8_sampling_profiler_.reset(new V8SamplingProfiler());
1086
1087   if (GetContentClient()->renderer()->RunIdleHandlerWhenWidgetsHidden())
1088     ScheduleIdleHandler(kLongIdleHandlerDelayMs);
1089
1090   cc_blink::SetSharedBitmapAllocationFunction(AllocateSharedBitmapFunction);
1091
1092   // Limit use of the scaled image cache to when deferred image decoding is
1093   // enabled.
1094   if (!command_line.HasSwitch(switches::kEnableDeferredImageDecoding) &&
1095       !is_impl_side_painting_enabled_)
1096     SkGraphics::SetResourceCacheTotalByteLimit(0u);
1097
1098   SkGraphics::SetResourceCacheSingleAllocationByteLimit(
1099       kImageCacheSingleAllocationByteLimit);
1100
1101   if (command_line.HasSwitch(switches::kMemoryMetrics)) {
1102     memory_observer_.reset(new MemoryObserver());
1103     message_loop()->AddTaskObserver(memory_observer_.get());
1104   }
1105 }
1106
1107 void RenderThreadImpl::RegisterSchemes() {
1108   // swappedout: pages should not be accessible, and should also
1109   // be treated as empty documents that can commit synchronously.
1110   WebString swappedout_scheme(base::ASCIIToUTF16(kSwappedOutScheme));
1111   WebSecurityPolicy::registerURLSchemeAsDisplayIsolated(swappedout_scheme);
1112   WebSecurityPolicy::registerURLSchemeAsEmptyDocument(swappedout_scheme);
1113 }
1114
1115 void RenderThreadImpl::NotifyTimezoneChange() {
1116   NotifyTimezoneChangeOnThisThread();
1117   RenderThread::Get()->PostTaskToAllWebWorkers(
1118       base::Bind(&NotifyTimezoneChangeOnThisThread));
1119 }
1120
1121 void RenderThreadImpl::RecordAction(const base::UserMetricsAction& action) {
1122   Send(new ViewHostMsg_UserMetricsRecordAction(action.str_));
1123 }
1124
1125 void RenderThreadImpl::RecordComputedAction(const std::string& action) {
1126   Send(new ViewHostMsg_UserMetricsRecordAction(action));
1127 }
1128
1129 scoped_ptr<base::SharedMemory>
1130     RenderThreadImpl::HostAllocateSharedMemoryBuffer(size_t size) {
1131   return ChildThreadImpl::AllocateSharedMemory(size, thread_safe_sender());
1132 }
1133
1134 cc::SharedBitmapManager* RenderThreadImpl::GetSharedBitmapManager() {
1135   return shared_bitmap_manager();
1136 }
1137
1138 void RenderThreadImpl::RegisterExtension(v8::Extension* extension) {
1139   WebScriptController::registerExtension(extension);
1140 }
1141
1142 void RenderThreadImpl::ScheduleIdleHandler(int64 initial_delay_ms) {
1143   idle_notification_delay_in_ms_ = initial_delay_ms;
1144   idle_timer_.Stop();
1145   idle_timer_.Start(FROM_HERE,
1146       base::TimeDelta::FromMilliseconds(initial_delay_ms),
1147       this, &RenderThreadImpl::IdleHandler);
1148 }
1149
1150 void RenderThreadImpl::IdleHandler() {
1151   bool run_in_foreground_tab = (widget_count_ > hidden_widget_count_) &&
1152                                GetContentClient()->renderer()->
1153                                    RunIdleHandlerWhenWidgetsHidden();
1154   if (run_in_foreground_tab) {
1155     if (idle_notifications_to_skip_ > 0) {
1156       --idle_notifications_to_skip_;
1157     } else {
1158       base::allocator::ReleaseFreeMemory();
1159       base::DiscardableMemory::ReduceMemoryUsage();
1160     }
1161     ScheduleIdleHandler(kLongIdleHandlerDelayMs);
1162     return;
1163   }
1164
1165   base::allocator::ReleaseFreeMemory();
1166   discardable_shared_memory_manager()->ReleaseFreeMemory();
1167
1168   // Continue the idle timer if the webkit shared timer is not suspended or
1169   // something is left to do.
1170   bool continue_timer = !webkit_shared_timer_suspended_;
1171
1172   if (blink::mainThreadIsolate() &&
1173       !blink::mainThreadIsolate()->IdleNotification(1000)) {
1174     continue_timer = true;
1175   }
1176   if (!base::DiscardableMemory::ReduceMemoryUsage()) {
1177     continue_timer = true;
1178   }
1179
1180   // Schedule next invocation. When the tab is originally hidden, an invocation
1181   // is scheduled for kInitialIdleHandlerDelayMs in
1182   // RenderThreadImpl::WidgetHidden in order to race to a minimal heap.
1183   // After that, idle calls can be much less frequent, so run at a maximum of
1184   // once every kLongIdleHandlerDelayMs.
1185   // Dampen the delay using the algorithm (if delay is in seconds):
1186   //    delay = delay + 1 / (delay + 2)
1187   // Using floor(delay) has a dampening effect such as:
1188   //    30s, 30, 30, 31, 31, 31, 31, 32, 32, ...
1189   // If the delay is in milliseconds, the above formula is equivalent to:
1190   //    delay_ms / 1000 = delay_ms / 1000 + 1 / (delay_ms / 1000 + 2)
1191   // which is equivalent to
1192   //    delay_ms = delay_ms + 1000*1000 / (delay_ms + 2000).
1193   if (continue_timer) {
1194     ScheduleIdleHandler(
1195         std::max(kLongIdleHandlerDelayMs,
1196                  idle_notification_delay_in_ms_ +
1197                  1000000 / (idle_notification_delay_in_ms_ + 2000)));
1198
1199   } else {
1200     idle_timer_.Stop();
1201   }
1202
1203   FOR_EACH_OBSERVER(RenderProcessObserver, observers_, IdleNotification());
1204 }
1205
1206 int64 RenderThreadImpl::GetIdleNotificationDelayInMs() const {
1207   return idle_notification_delay_in_ms_;
1208 }
1209
1210 void RenderThreadImpl::SetIdleNotificationDelayInMs(
1211     int64 idle_notification_delay_in_ms) {
1212   idle_notification_delay_in_ms_ = idle_notification_delay_in_ms;
1213 }
1214
1215 void RenderThreadImpl::UpdateHistograms(int sequence_number) {
1216   child_histogram_message_filter()->SendHistograms(sequence_number);
1217 }
1218
1219 int RenderThreadImpl::PostTaskToAllWebWorkers(const base::Closure& closure) {
1220   return WorkerTaskRunner::Instance()->PostTaskToAllThreads(closure);
1221 }
1222
1223 bool RenderThreadImpl::ResolveProxy(const GURL& url, std::string* proxy_list) {
1224   bool result = false;
1225   Send(new ViewHostMsg_ResolveProxy(url, &result, proxy_list));
1226   return result;
1227 }
1228
1229 void RenderThreadImpl::PostponeIdleNotification() {
1230   idle_notifications_to_skip_ = 2;
1231 }
1232
1233 scoped_refptr<media::GpuVideoAcceleratorFactories>
1234 RenderThreadImpl::GetGpuFactories() {
1235   DCHECK(IsMainThread());
1236
1237   scoped_refptr<GpuChannelHost> gpu_channel_host = GetGpuChannel();
1238   const base::CommandLine* cmd_line = base::CommandLine::ForCurrentProcess();
1239   scoped_refptr<media::GpuVideoAcceleratorFactories> gpu_factories;
1240   scoped_refptr<base::SingleThreadTaskRunner> media_task_runner =
1241       GetMediaThreadTaskRunner();
1242   if (!cmd_line->HasSwitch(switches::kDisableAcceleratedVideoDecode)) {
1243     if (!gpu_va_context_provider_.get() ||
1244         gpu_va_context_provider_->DestroyedOnMainThread()) {
1245       if (!gpu_channel_host.get()) {
1246         gpu_channel_host = EstablishGpuChannelSync(
1247             CAUSE_FOR_GPU_LAUNCH_WEBGRAPHICSCONTEXT3DCOMMANDBUFFERIMPL_INITIALIZE);
1248       }
1249       blink::WebGraphicsContext3D::Attributes attributes;
1250       bool lose_context_when_out_of_memory = false;
1251       gpu_va_context_provider_ = ContextProviderCommandBuffer::Create(
1252           make_scoped_ptr(
1253               WebGraphicsContext3DCommandBufferImpl::CreateOffscreenContext(
1254                   gpu_channel_host.get(),
1255                   attributes,
1256                   lose_context_when_out_of_memory,
1257                   GURL("chrome://gpu/RenderThreadImpl::GetGpuVDAContext3D"),
1258                   WebGraphicsContext3DCommandBufferImpl::SharedMemoryLimits(),
1259                   NULL)),
1260           "GPU-VideoAccelerator-Offscreen");
1261     }
1262   }
1263   if (gpu_va_context_provider_.get()) {
1264     gpu_factories = RendererGpuVideoAcceleratorFactories::Create(
1265         gpu_channel_host.get(), media_task_runner, gpu_va_context_provider_);
1266   }
1267   return gpu_factories;
1268 }
1269
1270 scoped_ptr<WebGraphicsContext3DCommandBufferImpl>
1271 RenderThreadImpl::CreateOffscreenContext3d() {
1272   blink::WebGraphicsContext3D::Attributes attributes(GetOffscreenAttribs());
1273   bool lose_context_when_out_of_memory = true;
1274
1275   scoped_refptr<GpuChannelHost> gpu_channel_host(EstablishGpuChannelSync(
1276       CAUSE_FOR_GPU_LAUNCH_WEBGRAPHICSCONTEXT3DCOMMANDBUFFERIMPL_INITIALIZE));
1277   return make_scoped_ptr(
1278       WebGraphicsContext3DCommandBufferImpl::CreateOffscreenContext(
1279           gpu_channel_host.get(),
1280           attributes,
1281           lose_context_when_out_of_memory,
1282           GURL("chrome://gpu/RenderThreadImpl::CreateOffscreenContext3d"),
1283           WebGraphicsContext3DCommandBufferImpl::SharedMemoryLimits(),
1284           NULL));
1285 }
1286
1287 scoped_refptr<cc_blink::ContextProviderWebContext>
1288 RenderThreadImpl::SharedMainThreadContextProvider() {
1289   DCHECK(IsMainThread());
1290   if (!shared_main_thread_contexts_.get() ||
1291       shared_main_thread_contexts_->DestroyedOnMainThread()) {
1292     shared_main_thread_contexts_ = NULL;
1293 #if defined(OS_ANDROID)
1294     if (SynchronousCompositorFactory* factory =
1295             SynchronousCompositorFactory::GetInstance()) {
1296       shared_main_thread_contexts_ = factory->CreateOffscreenContextProvider(
1297           GetOffscreenAttribs(), "Offscreen-MainThread");
1298     }
1299 #endif
1300     if (!shared_main_thread_contexts_.get()) {
1301       shared_main_thread_contexts_ = ContextProviderCommandBuffer::Create(
1302           CreateOffscreenContext3d(), "Offscreen-MainThread");
1303     }
1304     if (shared_main_thread_contexts_.get() &&
1305         !shared_main_thread_contexts_->BindToCurrentThread())
1306       shared_main_thread_contexts_ = NULL;
1307   }
1308   return shared_main_thread_contexts_;
1309 }
1310
1311 AudioRendererMixerManager* RenderThreadImpl::GetAudioRendererMixerManager() {
1312   if (!audio_renderer_mixer_manager_) {
1313     audio_renderer_mixer_manager_.reset(new AudioRendererMixerManager(
1314         GetAudioHardwareConfig()));
1315   }
1316
1317   return audio_renderer_mixer_manager_.get();
1318 }
1319
1320 media::AudioHardwareConfig* RenderThreadImpl::GetAudioHardwareConfig() {
1321   if (!audio_hardware_config_) {
1322     media::AudioParameters input_params;
1323     media::AudioParameters output_params;
1324     Send(new ViewHostMsg_GetAudioHardwareConfig(
1325         &input_params, &output_params));
1326
1327     audio_hardware_config_.reset(new media::AudioHardwareConfig(
1328         input_params, output_params));
1329     audio_message_filter_->SetAudioHardwareConfig(audio_hardware_config_.get());
1330   }
1331
1332   return audio_hardware_config_.get();
1333 }
1334
1335 base::WaitableEvent* RenderThreadImpl::GetShutdownEvent() {
1336   return ChildProcess::current()->GetShutDownEvent();
1337 }
1338
1339 #if defined(OS_WIN)
1340 void RenderThreadImpl::PreCacheFontCharacters(const LOGFONT& log_font,
1341                                               const base::string16& str) {
1342   Send(new ViewHostMsg_PreCacheFontCharacters(log_font, str));
1343 }
1344
1345 #endif  // OS_WIN
1346
1347 ServiceRegistry* RenderThreadImpl::GetServiceRegistry() {
1348   return service_registry();
1349 }
1350
1351 bool RenderThreadImpl::IsImplSidePaintingEnabled() {
1352   return is_impl_side_painting_enabled_;
1353 }
1354
1355 bool RenderThreadImpl::IsGpuRasterizationForced() {
1356   return is_gpu_rasterization_forced_;
1357 }
1358
1359 bool RenderThreadImpl::IsGpuRasterizationEnabled() {
1360   return is_gpu_rasterization_enabled_;
1361 }
1362
1363 bool RenderThreadImpl::IsThreadedGpuRasterizationEnabled() {
1364   return is_threaded_gpu_rasterization_enabled_;
1365 }
1366
1367 int RenderThreadImpl::GetGpuRasterizationMSAASampleCount() {
1368   return gpu_rasterization_msaa_sample_count_;
1369 }
1370
1371 bool RenderThreadImpl::IsLcdTextEnabled() {
1372   return is_lcd_text_enabled_;
1373 }
1374
1375 bool RenderThreadImpl::IsDistanceFieldTextEnabled() {
1376   return is_distance_field_text_enabled_;
1377 }
1378
1379 bool RenderThreadImpl::IsZeroCopyEnabled() {
1380   return is_zero_copy_enabled_;
1381 }
1382
1383 bool RenderThreadImpl::IsOneCopyEnabled() {
1384   return is_one_copy_enabled_;
1385 }
1386
1387 bool RenderThreadImpl::IsElasticOverscrollEnabled() {
1388   return is_elastic_overscroll_enabled_;
1389 }
1390
1391 bool RenderThreadImpl::UseSingleThreadScheduler() {
1392   base::CommandLine* cmd = base::CommandLine::ForCurrentProcess();
1393   return !cmd->HasSwitch(switches::kDisableSingleThreadProxyScheduler);
1394 }
1395
1396 uint32 RenderThreadImpl::GetImageTextureTarget() {
1397   return use_image_texture_target_;
1398 }
1399
1400 scoped_refptr<base::SingleThreadTaskRunner>
1401 RenderThreadImpl::GetCompositorMainThreadTaskRunner() {
1402   return main_thread_compositor_task_runner_;
1403 }
1404
1405 scoped_refptr<base::SingleThreadTaskRunner>
1406 RenderThreadImpl::GetCompositorImplThreadTaskRunner() {
1407   return compositor_message_loop_proxy_;
1408 }
1409
1410 gpu::GpuMemoryBufferManager* RenderThreadImpl::GetGpuMemoryBufferManager() {
1411   return gpu_memory_buffer_manager();
1412 }
1413
1414 RendererScheduler* RenderThreadImpl::GetRendererScheduler() {
1415   return renderer_scheduler_.get();
1416 }
1417
1418 cc::ContextProvider* RenderThreadImpl::GetSharedMainThreadContextProvider() {
1419   return SharedMainThreadContextProvider().get();
1420 }
1421
1422 scoped_ptr<cc::BeginFrameSource>
1423 RenderThreadImpl::CreateExternalBeginFrameSource(int routing_id) {
1424 #if defined(OS_ANDROID)
1425   if (SynchronousCompositorFactory* factory =
1426           SynchronousCompositorFactory::GetInstance()) {
1427     return factory->CreateExternalBeginFrameSource(routing_id);
1428   }
1429 #endif
1430   return make_scoped_ptr(new CompositorExternalBeginFrameSource(
1431       compositor_message_filter_.get(), sync_message_filter(), routing_id));
1432 }
1433
1434 bool RenderThreadImpl::IsMainThread() {
1435   return !!current();
1436 }
1437
1438 base::MessageLoop* RenderThreadImpl::GetMainLoop() {
1439   return message_loop();
1440 }
1441
1442 scoped_refptr<base::MessageLoopProxy> RenderThreadImpl::GetIOLoopProxy() {
1443   return io_message_loop_proxy_;
1444 }
1445
1446 scoped_ptr<base::SharedMemory> RenderThreadImpl::AllocateSharedMemory(
1447     size_t size) {
1448   return scoped_ptr<base::SharedMemory>(
1449       HostAllocateSharedMemoryBuffer(size));
1450 }
1451
1452 CreateCommandBufferResult RenderThreadImpl::CreateViewCommandBuffer(
1453       int32 surface_id,
1454       const GPUCreateCommandBufferConfig& init_params,
1455       int32 route_id) {
1456   TRACE_EVENT1("gpu",
1457                "RenderThreadImpl::CreateViewCommandBuffer",
1458                "surface_id",
1459                surface_id);
1460
1461   CreateCommandBufferResult result = CREATE_COMMAND_BUFFER_FAILED;
1462   IPC::Message* message = new GpuHostMsg_CreateViewCommandBuffer(
1463       surface_id,
1464       init_params,
1465       route_id,
1466       &result);
1467
1468   // Allow calling this from the compositor thread.
1469   thread_safe_sender()->Send(message);
1470
1471   return result;
1472 }
1473
1474 void RenderThreadImpl::DoNotSuspendWebKitSharedTimer() {
1475   suspend_webkit_shared_timer_ = false;
1476 }
1477
1478 void RenderThreadImpl::DoNotNotifyWebKitOfModalLoop() {
1479   notify_webkit_of_modal_loop_ = false;
1480 }
1481
1482 bool RenderThreadImpl::OnControlMessageReceived(const IPC::Message& msg) {
1483   ObserverListBase<RenderProcessObserver>::Iterator it(observers_);
1484   RenderProcessObserver* observer;
1485   while ((observer = it.GetNext()) != NULL) {
1486     if (observer->OnControlMessageReceived(msg))
1487       return true;
1488   }
1489
1490   // Some messages are handled by delegates.
1491   if (appcache_dispatcher_->OnMessageReceived(msg) ||
1492       dom_storage_dispatcher_->OnMessageReceived(msg) ||
1493       embedded_worker_dispatcher_->OnMessageReceived(msg)) {
1494     return true;
1495   }
1496
1497   bool handled = true;
1498   IPC_BEGIN_MESSAGE_MAP(RenderThreadImpl, msg)
1499     IPC_MESSAGE_HANDLER(FrameMsg_NewFrame, OnCreateNewFrame)
1500     IPC_MESSAGE_HANDLER(FrameMsg_NewFrameProxy, OnCreateNewFrameProxy)
1501     IPC_MESSAGE_HANDLER(ViewMsg_SetZoomLevelForCurrentURL,
1502                         OnSetZoomLevelForCurrentURL)
1503     // TODO(port): removed from render_messages_internal.h;
1504     // is there a new non-windows message I should add here?
1505     IPC_MESSAGE_HANDLER(ViewMsg_New, OnCreateNewView)
1506     IPC_MESSAGE_HANDLER(ViewMsg_NetworkTypeChanged, OnNetworkTypeChanged)
1507     IPC_MESSAGE_HANDLER(ViewMsg_TempCrashWithData, OnTempCrashWithData)
1508     IPC_MESSAGE_HANDLER(WorkerProcessMsg_CreateWorker, OnCreateNewSharedWorker)
1509     IPC_MESSAGE_HANDLER(ViewMsg_TimezoneChange, OnUpdateTimezone)
1510 #if defined(OS_ANDROID)
1511     IPC_MESSAGE_HANDLER(ViewMsg_SetWebKitSharedTimersSuspended,
1512                         OnSetWebKitSharedTimersSuspended)
1513 #endif
1514 #if defined(OS_MACOSX)
1515     IPC_MESSAGE_HANDLER(ViewMsg_UpdateScrollbarTheme, OnUpdateScrollbarTheme)
1516 #endif
1517 #if defined(ENABLE_PLUGINS)
1518     IPC_MESSAGE_HANDLER(ViewMsg_PurgePluginListCache, OnPurgePluginListCache)
1519 #endif
1520     IPC_MESSAGE_UNHANDLED(handled = false)
1521   IPC_END_MESSAGE_MAP()
1522   return handled;
1523 }
1524
1525 void RenderThreadImpl::OnCreateNewFrame(
1526     int routing_id,
1527     int parent_routing_id,
1528     int proxy_routing_id,
1529     const FrameReplicationState& replicated_state,
1530     FrameMsg_NewFrame_WidgetParams params) {
1531   CompositorDependencies* compositor_deps = this;
1532   RenderFrameImpl::CreateFrame(routing_id, parent_routing_id, proxy_routing_id,
1533                                replicated_state, compositor_deps, params);
1534 }
1535
1536 void RenderThreadImpl::OnCreateNewFrameProxy(
1537     int routing_id,
1538     int parent_routing_id,
1539     int render_view_routing_id,
1540     const FrameReplicationState& replicated_state) {
1541   RenderFrameProxy::CreateFrameProxy(routing_id, parent_routing_id,
1542                                      render_view_routing_id, replicated_state);
1543 }
1544
1545 void RenderThreadImpl::OnSetZoomLevelForCurrentURL(const std::string& scheme,
1546                                                    const std::string& host,
1547                                                    double zoom_level) {
1548   RenderViewZoomer zoomer(scheme, host, zoom_level);
1549   RenderView::ForEach(&zoomer);
1550 }
1551
1552 void RenderThreadImpl::OnCreateNewView(const ViewMsg_New_Params& params) {
1553   EnsureWebKitInitialized();
1554   CompositorDependencies* compositor_deps = this;
1555   // When bringing in render_view, also bring in webkit's glue and jsbindings.
1556   RenderViewImpl::Create(params, compositor_deps, false);
1557 }
1558
1559 GpuChannelHost* RenderThreadImpl::EstablishGpuChannelSync(
1560     CauseForGpuLaunch cause_for_gpu_launch) {
1561   TRACE_EVENT0("gpu", "RenderThreadImpl::EstablishGpuChannelSync");
1562
1563   if (gpu_channel_.get()) {
1564     // Do nothing if we already have a GPU channel or are already
1565     // establishing one.
1566     if (!gpu_channel_->IsLost())
1567       return gpu_channel_.get();
1568
1569     // Recreate the channel if it has been lost.
1570     gpu_channel_ = NULL;
1571   }
1572
1573   // Ask the browser for the channel name.
1574   int client_id = 0;
1575   IPC::ChannelHandle channel_handle;
1576   gpu::GPUInfo gpu_info;
1577   if (!Send(new GpuHostMsg_EstablishGpuChannel(cause_for_gpu_launch,
1578                                                &client_id,
1579                                                &channel_handle,
1580                                                &gpu_info)) ||
1581 #if defined(OS_POSIX)
1582       channel_handle.socket.fd == -1 ||
1583 #endif
1584       channel_handle.name.empty()) {
1585     // Otherwise cancel the connection.
1586     return NULL;
1587   }
1588
1589   GetContentClient()->SetGpuInfo(gpu_info);
1590
1591   // Cache some variables that are needed on the compositor thread for our
1592   // implementation of GpuChannelHostFactory.
1593   io_message_loop_proxy_ = ChildProcess::current()->io_message_loop_proxy();
1594
1595   gpu_channel_ =
1596       GpuChannelHost::Create(this,
1597                              gpu_info,
1598                              channel_handle,
1599                              ChildProcess::current()->GetShutDownEvent(),
1600                              gpu_memory_buffer_manager());
1601   return gpu_channel_.get();
1602 }
1603
1604 blink::WebMediaStreamCenter* RenderThreadImpl::CreateMediaStreamCenter(
1605     blink::WebMediaStreamCenterClient* client) {
1606 #if defined(OS_ANDROID)
1607   if (base::CommandLine::ForCurrentProcess()->HasSwitch(
1608           switches::kDisableWebRTC))
1609     return NULL;
1610 #endif
1611
1612 #if defined(ENABLE_WEBRTC)
1613   if (!media_stream_center_) {
1614     media_stream_center_ = GetContentClient()->renderer()
1615         ->OverrideCreateWebMediaStreamCenter(client);
1616     if (!media_stream_center_) {
1617       scoped_ptr<MediaStreamCenter> media_stream_center(
1618           new MediaStreamCenter(client, GetPeerConnectionDependencyFactory()));
1619       media_stream_center_ = media_stream_center.release();
1620     }
1621   }
1622 #endif
1623   return media_stream_center_;
1624 }
1625
1626 #if defined(ENABLE_WEBRTC)
1627 PeerConnectionDependencyFactory*
1628 RenderThreadImpl::GetPeerConnectionDependencyFactory() {
1629   return peer_connection_factory_.get();
1630 }
1631 #endif
1632
1633 GpuChannelHost* RenderThreadImpl::GetGpuChannel() {
1634   if (!gpu_channel_.get())
1635     return NULL;
1636
1637   if (gpu_channel_->IsLost())
1638     return NULL;
1639
1640   return gpu_channel_.get();
1641 }
1642
1643 #if defined(ENABLE_PLUGINS)
1644 void RenderThreadImpl::OnPurgePluginListCache(bool reload_pages) {
1645   EnsureWebKitInitialized();
1646   // The call below will cause a GetPlugins call with refresh=true, but at this
1647   // point we already know that the browser has refreshed its list, so disable
1648   // refresh temporarily to prevent each renderer process causing the list to be
1649   // regenerated.
1650   blink_platform_impl_->set_plugin_refresh_allowed(false);
1651   blink::resetPluginCache(reload_pages);
1652   blink_platform_impl_->set_plugin_refresh_allowed(true);
1653
1654   FOR_EACH_OBSERVER(RenderProcessObserver, observers_, PluginListChanged());
1655 }
1656 #endif
1657
1658 void RenderThreadImpl::OnNetworkTypeChanged(
1659     net::NetworkChangeNotifier::ConnectionType type) {
1660   EnsureWebKitInitialized();
1661   bool online = type != net::NetworkChangeNotifier::CONNECTION_NONE;
1662   WebNetworkStateNotifier::setOnLine(online);
1663   FOR_EACH_OBSERVER(
1664       RenderProcessObserver, observers_, NetworkStateChanged(online));
1665   WebNetworkStateNotifier::setWebConnectionType(
1666       NetConnectionTypeToWebConnectionType(type));
1667 }
1668
1669 void RenderThreadImpl::OnTempCrashWithData(const GURL& data) {
1670   GetContentClient()->SetActiveURL(data);
1671   CHECK(false);
1672 }
1673
1674 void RenderThreadImpl::OnUpdateTimezone() {
1675   if (!blink_platform_impl_)
1676     return;
1677   NotifyTimezoneChange();
1678 }
1679
1680 #if defined(OS_ANDROID)
1681 void RenderThreadImpl::OnSetWebKitSharedTimersSuspended(bool suspend) {
1682   if (suspend_webkit_shared_timer_) {
1683     EnsureWebKitInitialized();
1684     if (suspend) {
1685       blink_platform_impl_->SuspendSharedTimer();
1686     } else {
1687       blink_platform_impl_->ResumeSharedTimer();
1688     }
1689     webkit_shared_timer_suspended_ = suspend;
1690   }
1691 }
1692 #endif
1693
1694 #if defined(OS_MACOSX)
1695 void RenderThreadImpl::OnUpdateScrollbarTheme(
1696     float initial_button_delay,
1697     float autoscroll_button_delay,
1698     bool jump_on_track_click,
1699     blink::ScrollerStyle preferred_scroller_style,
1700     bool redraw) {
1701   EnsureWebKitInitialized();
1702   static_cast<WebScrollbarBehaviorImpl*>(
1703       blink_platform_impl_->scrollbarBehavior())
1704       ->set_jump_on_track_click(jump_on_track_click);
1705   blink::WebScrollbarTheme::updateScrollbars(initial_button_delay,
1706                                              autoscroll_button_delay,
1707                                              preferred_scroller_style,
1708                                              redraw);
1709 }
1710 #endif
1711
1712 void RenderThreadImpl::OnCreateNewSharedWorker(
1713     const WorkerProcessMsg_CreateWorker_Params& params) {
1714   // EmbeddedSharedWorkerStub will self-destruct.
1715   new EmbeddedSharedWorkerStub(params.url,
1716                                params.name,
1717                                params.content_security_policy,
1718                                params.security_policy_type,
1719                                params.pause_on_start,
1720                                params.route_id);
1721 }
1722
1723 void RenderThreadImpl::OnMemoryPressure(
1724     base::MemoryPressureListener::MemoryPressureLevel memory_pressure_level) {
1725   base::allocator::ReleaseFreeMemory();
1726
1727   // Do not call into blink if it is not initialized.
1728   if (blink_platform_impl_) {
1729     blink::WebCache::pruneAll();
1730
1731     if (blink::mainThreadIsolate()) {
1732       // Trigger full v8 garbage collection on memory pressure notifications.
1733       // This will potentially hang the renderer for a long time, however, when
1734       // we receive a memory pressure notification, we might be about to be
1735       // killed.
1736       blink::mainThreadIsolate()->LowMemoryNotification();
1737       RenderThread::Get()->PostTaskToAllWebWorkers(
1738           base::Bind(&LowMemoryNotificationOnThisThread));
1739     }
1740
1741     if (memory_pressure_level ==
1742         base::MemoryPressureListener::MEMORY_PRESSURE_LEVEL_CRITICAL) {
1743       // Clear the image cache.
1744       blink::WebImageCache::clear();
1745
1746       // Purge Skia font cache, by setting it to 0 and then again to the
1747       // previous limit.
1748       size_t font_cache_limit = SkGraphics::SetFontCacheLimit(0);
1749       SkGraphics::SetFontCacheLimit(font_cache_limit);
1750     }
1751   }
1752 }
1753
1754 scoped_refptr<base::MessageLoopProxy>
1755 RenderThreadImpl::GetFileThreadMessageLoopProxy() {
1756   DCHECK(message_loop() == base::MessageLoop::current());
1757   if (!file_thread_) {
1758     file_thread_.reset(new base::Thread("Renderer::FILE"));
1759     file_thread_->Start();
1760   }
1761   return file_thread_->message_loop_proxy();
1762 }
1763
1764 scoped_refptr<base::SingleThreadTaskRunner>
1765 RenderThreadImpl::GetMediaThreadTaskRunner() {
1766   DCHECK(message_loop() == base::MessageLoop::current());
1767   if (!media_thread_) {
1768     media_thread_.reset(new base::Thread("Media"));
1769     media_thread_->Start();
1770
1771 #if defined(OS_ANDROID)
1772     renderer_demuxer_ = new RendererDemuxerAndroid();
1773     AddFilter(renderer_demuxer_.get());
1774 #endif
1775   }
1776   return media_thread_->message_loop_proxy();
1777 }
1778
1779 void RenderThreadImpl::SampleGamepads(blink::WebGamepads* data) {
1780   blink_platform_impl_->sampleGamepads(*data);
1781 }
1782
1783 void RenderThreadImpl::WidgetCreated() {
1784   widget_count_++;
1785 }
1786
1787 void RenderThreadImpl::WidgetDestroyed() {
1788   widget_count_--;
1789 }
1790
1791 void RenderThreadImpl::WidgetHidden() {
1792   DCHECK_LT(hidden_widget_count_, widget_count_);
1793   hidden_widget_count_++;
1794
1795   if (widget_count_ && hidden_widget_count_ == widget_count_) {
1796     // TODO(reveman): Remove this when we have a better mechanism to prevent
1797     // total discardable memory used by all renderers from growing too large.
1798     base::internal::DiscardableMemoryEmulated::
1799         ReduceMemoryUsageUntilWithinLimit(
1800             kEmulatedDiscardableMemoryBytesToKeepWhenWidgetsHidden);
1801
1802     if (GetContentClient()->renderer()->RunIdleHandlerWhenWidgetsHidden())
1803       ScheduleIdleHandler(kInitialIdleHandlerDelayMs);
1804   }
1805 }
1806
1807 void RenderThreadImpl::WidgetRestored() {
1808   DCHECK_GT(hidden_widget_count_, 0);
1809   hidden_widget_count_--;
1810
1811   if (!GetContentClient()->renderer()->RunIdleHandlerWhenWidgetsHidden()) {
1812     return;
1813   }
1814
1815   ScheduleIdleHandler(kLongIdleHandlerDelayMs);
1816 }
1817
1818 RenderThreadImpl::PendingRenderFrameConnect::PendingRenderFrameConnect(
1819     mojo::InterfaceRequest<mojo::ServiceProvider> services,
1820     mojo::ServiceProviderPtr exposed_services)
1821     : services(services.Pass()),
1822       exposed_services(exposed_services.Pass()) {
1823 }
1824
1825 RenderThreadImpl::PendingRenderFrameConnect::~PendingRenderFrameConnect() {
1826 }
1827
1828 }  // namespace content