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 957e6acd2b49ef0628a75c5ca74c9313e8afd310..cb1e67b3c4b7463675501858675a814ed9a6ae80 100644
--- a/content/renderer/render_thread_impl.cc
+++ b/content/renderer/render_thread_impl.cc
@@ -1695,7 +1695,11 @@ 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.
+  memory_coordinator::ChildMemoryCoordinatorImpl::GetInstance()
+      ->PrepareToSuspend();
+
   is_renderer_suspended_ = true;
   renderer_scheduler_->SuspendRenderer();
 }