Hook up ui::Compositor to Display's BeginFrameSource

cc/output/output_surface_unittest.cc

Index: cc/output/output_surface_unittest.cc
diff --git a/cc/output/output_surface_unittest.cc b/cc/output/output_surface_unittest.cc
index 36848522ea5bba9f9c2f2cc6a2ef995a73c8b7ce..030b910719e59e6f2f6538c8e1e139a26eae48db 100644
--- a/cc/output/output_surface_unittest.cc
+++ b/cc/output/output_surface_unittest.cc
@@ -40,11 +40,6 @@ class TestOutputSurface : public OutputSurface {
     client_->DidSwapBuffersComplete();
   }
 
-  void CommitVSyncParametersForTesting(base::TimeTicks timebase,
-                                       base::TimeDelta interval) {
-    CommitVSyncParameters(timebase, interval);
-  }
-
   void DidSwapBuffersForTesting() { client_->DidSwapBuffers(); }
 
   void OnSwapBuffersCompleteForTesting() { client_->DidSwapBuffersComplete(); }