Refactoring the way begin frame sources inside scheduler work.

cc/trees/layer_tree_host_impl_unittest.cc

Index: cc/trees/layer_tree_host_impl_unittest.cc
diff --git a/cc/trees/layer_tree_host_impl_unittest.cc b/cc/trees/layer_tree_host_impl_unittest.cc
index d9afdd861c4f42e21fab9b756a2c469c18529515..a98e005257ad31ab46682cb3fe8a677be7299083 100644
--- a/cc/trees/layer_tree_host_impl_unittest.cc
+++ b/cc/trees/layer_tree_host_impl_unittest.cc
@@ -111,13 +111,10 @@ class LayerTreeHostImplTest : public testing::Test,
 
   virtual void UpdateRendererCapabilitiesOnImplThread() OVERRIDE {}
   virtual void DidLoseOutputSurfaceOnImplThread() OVERRIDE {}
-  virtual void CommitVSyncParameters(base::TimeTicks timebase,
-                                     base::TimeDelta interval) OVERRIDE {}
   virtual void SetEstimatedParentDrawTime(base::TimeDelta draw_time) OVERRIDE {}
   virtual void SetMaxSwapsPendingOnImplThread(int max) OVERRIDE {}
   virtual void DidSwapBuffersOnImplThread() OVERRIDE {}
   virtual void DidSwapBuffersCompleteOnImplThread() OVERRIDE {}
-  virtual void BeginFrame(const BeginFrameArgs& args) OVERRIDE {}
   virtual void OnCanDrawStateChanged(bool can_draw) OVERRIDE {
     on_can_draw_state_changed_called_ = true;
   }