Purge memory before suspending timer queues when backgrounded.

content/renderer/renderer_blink_platform_impl.cc

 // Copyright (c) 2012 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "content/renderer/renderer_blink_platform_impl.h"
 
 #include <memory>
 #include <utility>
 
 #include "base/command_line.h"
@@ skipping 221 matching lines @@
   base::Lock unicode_font_families_mutex_;
   std::map<int32_t, blink::WebFallbackFont> unicode_font_families_;
 #endif
 };
 #endif  // !defined(OS_ANDROID) && !defined(OS_WIN)
 
 //------------------------------------------------------------------------------
 
 RendererBlinkPlatformImpl::RendererBlinkPlatformImpl(
     blink::scheduler::RendererScheduler* renderer_scheduler,
-    base::WeakPtr<service_manager::InterfaceProvider> remote_interfaces)
+    base::WeakPtr<service_manager::InterfaceProvider> remote_interfaces,
+    content::ChildMemoryCoordinatorImpl* memory_coordinator)
     : BlinkPlatformImpl(renderer_scheduler->DefaultTaskRunner()),
       main_thread_(renderer_scheduler->CreateMainThread()),
       clipboard_delegate_(new RendererClipboardDelegate),
       clipboard_(new WebClipboardImpl(clipboard_delegate_.get())),
       sudden_termination_disables_(0),
       plugin_refresh_allowed_(true),
       default_task_runner_(renderer_scheduler->DefaultTaskRunner()),
       loading_task_runner_(renderer_scheduler->LoadingTaskRunner()),
       web_scrollbar_behavior_(new WebScrollbarBehaviorImpl),
       renderer_scheduler_(renderer_scheduler),
       blink_interface_provider_(
-          new BlinkInterfaceProviderImpl(remote_interfaces)) {
+          new BlinkInterfaceProviderImpl(remote_interfaces)),
+      memory_coordinator_(memory_coordinator) {
 #if !defined(OS_ANDROID) && !defined(OS_WIN)
   if (g_sandbox_enabled && sandboxEnabled()) {
     sandbox_support_.reset(new RendererBlinkPlatformImpl::SandboxSupport);
   } else {
     DVLOG(1) << "Disabling sandbox support for testing.";
   }
 #endif
 
   // RenderThread may not exist in some tests.
   if (RenderThreadImpl::current()) {
@@ skipping 1017 matching lines @@
 RendererBlinkPlatformImpl::trialTokenValidator() {
   return &trial_token_validator_;
 }
 
 void RendererBlinkPlatformImpl::workerContextCreated(
     const v8::Local<v8::Context>& worker) {
   GetContentClient()->renderer()->DidInitializeWorkerContextOnWorkerThread(
       worker);
 }
 
+//------------------------------------------------------------------------------
+void RendererBlinkPlatformImpl::requestPurgeMemory() {
+  DCHECK(memory_coordinator_);
+  memory_coordinator_->PurgeMemory();
+}
+
 }  // namespace content