Deliver IPC messages together with SwapCompositorFrame

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 c5fe7e4be0272f0be3f77cdce7a01ca39c82b7cf..235f733b2bbb8435097cfe05d78a90d9124bc56c 100644
--- a/content/renderer/gpu/render_widget_compositor.h
+++ b/content/renderer/gpu/render_widget_compositor.h
@@ -26,6 +26,7 @@ namespace cc {
 class InputHandler;
 class Layer;
 class LayerTreeHost;
+class SwapPromise;
 }
 
 namespace content {
@@ -64,6 +65,7 @@ class RenderWidgetCompositor : public blink::WebLayerTreeView,
   // into a LatencyInfoSwapPromise.
   scoped_ptr<cc::SwapPromiseMonitor> CreateLatencyInfoSwapPromiseMonitor(
       ui::LatencyInfo* latency);
+  void QueueSwapPromise(scoped_ptr<cc::SwapPromise> promise);
   int GetLayerTreeId() const;
   void NotifyInputThrottledUntilCommit();
   const cc::Layer* GetRootLayer() const;
@@ -71,6 +73,7 @@ class RenderWidgetCompositor : public blink::WebLayerTreeView,
       const std::string& name,
       scoped_ptr<base::Value> value,
       const base::Callback<void(scoped_ptr<base::Value>)>& callback);
+  int source_frame_number();
 
   // WebLayerTreeView implementation.
   virtual void setSurfaceReady();