cc: Plumbing for BeginFrameSource based on Surfaces

cc/surfaces/surface_factory.h

Index: cc/surfaces/surface_factory.h
diff --git a/cc/surfaces/surface_factory.h b/cc/surfaces/surface_factory.h
index 762d5a29e8965534d71dab2fd399915d45b89e15..1347728070a1dd075e8e1495f53b01bf181c1eb3 100644
--- a/cc/surfaces/surface_factory.h
+++ b/cc/surfaces/surface_factory.h
@@ -23,6 +23,7 @@ class Size;
 }
 
 namespace cc {
+class BeginFrameSource;
 class CopyOutputRequest;
 class Surface;
 class SurfaceFactoryClient;
@@ -46,6 +47,10 @@ class CC_SURFACES_EXPORT SurfaceFactory
   void Create(SurfaceId surface_id);
   void Destroy(SurfaceId surface_id);
   void DestroyAll();
+
+  void SetBeginFrameSource(SurfaceId surface_id,
+                           BeginFrameSource* begin_frame_source);
+
   // A frame can only be submitted to a surface created by this factory,
   // although the frame may reference surfaces created by other factories.
   // The callback is called the first time this frame is used to draw, or if