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 5af8d2e0eb760ef0c80739d17630f2645c29cb93..ccc259a996496fc3ba6ef79c47f1688a6b7bd0f7 100644
--- a/cc/surfaces/surface_factory.h
+++ b/cc/surfaces/surface_factory.h
@@ -22,6 +22,7 @@ class Size;
 }
 
 namespace cc {
+class BeginFrameSource;
 class CopyOutputRequest;
 class Surface;
 class SurfaceFactoryClient;
@@ -45,6 +46,10 @@ 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
@@ -80,6 +85,8 @@ class CC_SURFACES_EXPORT SurfaceFactory
       OwningSurfaceMap;
   OwningSurfaceMap surface_map_;
 
+  SurfaceId most_recently_created_surface_id_;
+
   DISALLOW_COPY_AND_ASSIGN(SurfaceFactory);
 };