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 1014ad1f1d8aebfd54d130828907e4b68d559089..bebd2457275116d0fa4ae27025d84486118c9ea4 100644
--- a/cc/output/output_surface_unittest.cc
+++ b/cc/output/output_surface_unittest.cc
@@ -42,11 +42,6 @@ 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(); }