Make cc::SoftwareImageDecodeController, cc::ResourcePool, and cc::StagingBufferPoo…

content/renderer/render_thread_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/render_thread_impl.h"
 
 #include <algorithm>
 #include <limits>
 #include <map>
 #include <utility>
@@ skipping 1678 matching lines @@
   } else {
     renderer_scheduler_->OnRendererForegrounded();
     is_renderer_suspended_ = false;
   }
 }
 
 void RenderThreadImpl::OnProcessPurgeAndSuspend() {
   ChildThreadImpl::OnProcessPurgeAndSuspend();
   if (is_renderer_suspended_)
     return;
-  // TODO(hajimehoshi): Implement purging e.g. cache (crbug/607077)
+
+  // Use ChildMemoryCoordinator to free this renderer's caches as much as
+  // possible before suspending the renderer.
+  if (memory_coordinator_)
+    memory_coordinator_->PrepareToSuspend();

[tasak, 2016/09/15 10:28:01]

The code is just for explaining how to invoke PrepareToSuspend (for
Purge+Suspend).
I will add this code in another CL.

+
   is_renderer_suspended_ = true;
   renderer_scheduler_->SuspendRenderer();
 }
 
 void RenderThreadImpl::OnCreateNewFrame(FrameMsg_NewFrame_Params params) {
   // Debug cases of https://crbug.com/626802.
   base::debug::SetCrashKeyValue("newframe_routing_id",
                                 base::IntToString(params.routing_id));
   base::debug::SetCrashKeyValue("newframe_proxy_id",
                                 base::IntToString(params.proxy_routing_id));
@@ skipping 535 matching lines @@
   if (blink::mainThreadIsolate()) {
     blink::mainThreadIsolate()->MemoryPressureNotification(
         v8::MemoryPressureLevel::kCritical);
     blink::MemoryPressureNotificationToWorkerThreadIsolates(
         v8::MemoryPressureLevel::kCritical);
   }
 }
 
 
 }  // namespace content