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 4160df2de20f5c820d488c05a8106cb794190cc9..f3be5b25a02b4b23c21152a2e899dddb7b7ca45b 100644
--- a/content/renderer/gpu/render_widget_compositor.h
+++ b/content/renderer/gpu/render_widget_compositor.h
@@ -27,6 +27,7 @@ namespace cc {
 class InputHandler;
 class Layer;
 class LayerTreeHost;
+class SwapPromise;
 }
 
 namespace content {
@@ -68,6 +69,7 @@ class RenderWidgetCompositor : public blink::WebLayerTreeView,
   // LayerTreeHost.
   void QueueSwapPromise(scoped_ptr<cc::SwapPromise> swap_promise);
   int GetLayerTreeId() const;
+  int GetSourceFrameNumber() const;
   void NotifyInputThrottledUntilCommit();
   const cc::Layer* GetRootLayer() const;
   int ScheduleMicroBenchmark(
@@ -103,6 +105,7 @@ class RenderWidgetCompositor : public blink::WebLayerTreeView,
                                        double duration_sec);
   virtual void heuristicsForGpuRasterizationUpdated(bool matches_heuristics);
   virtual void setNeedsAnimate();
+  virtual void setNeedsCommit();

[piman, 2014/06/24 19:35:53]

nit: that's not part of WebLayerTreeView, so you can keep as a non-virtual
method (with Chrome style).

[mkosiba (inactive), 2014/06/25 18:40:38]

Done.

   virtual bool commitRequested() const;
   virtual void didStopFlinging();
   virtual void compositeAndReadbackAsync(