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

content/renderer/render_thread_impl.cc

Index: content/renderer/render_thread_impl.cc
diff --git a/content/renderer/render_thread_impl.cc b/content/renderer/render_thread_impl.cc
index ab786991e9b274cf3f6becf12d1d6081d87d4502..f7c17c8e21969c88243d95717aae858ea015aaae 100644
--- a/content/renderer/render_thread_impl.cc
+++ b/content/renderer/render_thread_impl.cc
@@ -1696,7 +1696,12 @@ 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();
 }