cc: Plumbing for BeginFrameSource based on Surfaces

cc/surfaces/surface_factory_client.h

Index: cc/surfaces/surface_factory_client.h
diff --git a/cc/surfaces/surface_factory_client.h b/cc/surfaces/surface_factory_client.h
index 9866b279dd6e4f02325af6990b455f37abafb640..b20e185e72388bc0016b742f956eb6e971c4691b 100644
--- a/cc/surfaces/surface_factory_client.h
+++ b/cc/surfaces/surface_factory_client.h
@@ -10,11 +10,14 @@
 
 namespace cc {
 
+class BeginFrameSource;
+
 class CC_SURFACES_EXPORT SurfaceFactoryClient {
  public:
   virtual ~SurfaceFactoryClient() {}
 
   virtual void ReturnResources(const ReturnedResourceArray& resources) = 0;
+  virtual void SetBeginFrameSource(BeginFrameSource* begin_frame_source) = 0;
 };
 
 }  // namespace cc