cc: Setup API to release OutputSurface from LTHClient.

content/renderer/gpu/render_widget_compositor.h

Index: content/renderer/gpu/render_widget_compositor.h
diff --git a/content/renderer/gpu/render_widget_compositor.h b/content/renderer/gpu/render_widget_compositor.h
index 185ac08e7f764bc9a278237fbfae39ac0a86fe62..6d8ff5fa1605bdb22d91cbe5bc7d63c0394c61b9 100644
--- a/content/renderer/gpu/render_widget_compositor.h
+++ b/content/renderer/gpu/render_widget_compositor.h
@@ -78,6 +78,7 @@ class CONTENT_EXPORT RenderWidgetCompositor
   bool SendMessageToMicroBenchmark(int id, scoped_ptr<base::Value> value);
   void StartCompositor();
   void SetSurfaceIdNamespace(uint32_t surface_id_namespace);
+  scoped_ptr<cc::OutputSurface> GiveBackOutputSurface();
 
   // WebLayerTreeView implementation.
   virtual void setRootLayer(const blink::WebLayer& layer);
@@ -193,6 +194,7 @@ class CONTENT_EXPORT RenderWidgetCompositor
 
   blink::WebLayoutAndPaintAsyncCallback* layout_and_paint_async_callback_;
   scoped_ptr<cc::CopyOutputRequest> temporary_copy_output_request_;
+  bool did_give_back_output_surface_;
 
   base::WeakPtrFactory<RenderWidgetCompositor> weak_factory_;
 };