Hook up ui::Compositor to Display's BeginFrameSource

cc/surfaces/display_client.h

Index: cc/surfaces/display_client.h
diff --git a/cc/surfaces/display_client.h b/cc/surfaces/display_client.h
index 61ea4d39970e79678e433eb8da6a784bdd5fe4c5..750943581cf4d88f78e4965520560d869fbc82ad 100644
--- a/cc/surfaces/display_client.h
+++ b/cc/surfaces/display_client.h
@@ -10,12 +10,11 @@
 
 namespace cc {
 
+class BeginFrameSource;
 struct ManagedMemoryPolicy;
 
 class DisplayClient {
  public:
-  virtual void CommitVSyncParameters(base::TimeTicks timebase,
-                                     base::TimeDelta interval) = 0;
   virtual void OutputSurfaceLost() = 0;
   virtual void SetMemoryPolicy(const ManagedMemoryPolicy& policy) = 0;