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 605769b9e6bd1c8adde074de5f3644b54ae62b42..3ed07126fef5ab809c0ebed15b49265d3653fddf 100644
--- a/content/renderer/render_thread_impl.cc
+++ b/content/renderer/render_thread_impl.cc
@@ -1683,7 +1683,11 @@ 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();
 }