cc: Add testing stubs for proxy test

cc/test/layer_tree_test.h

Index: cc/test/layer_tree_test.h
diff --git a/cc/test/layer_tree_test.h b/cc/test/layer_tree_test.h
index 41e27f00544ba46c1368c3d4fd48c5435f89daad..2c078a1cebc3d6c05a271088e5c3cd86bdbd1df6 100644
--- a/cc/test/layer_tree_test.h
+++ b/cc/test/layer_tree_test.h
@@ -78,6 +78,12 @@ class TestHooks : public AnimationDelegate {
                                        bool visible) {}
   virtual base::TimeDelta LowFrequencyAnimationInterval() const;
 
+  // Hooks for SchedulerClient.
+  virtual void ScheduledActionBeginOutputSurfaceCreation() {}
+  virtual void ScheduledActionSendBeginMainFrame() {}
+  virtual void ScheduledActionCommit() {}
+  virtual void ScheduledActionDrawAndSwapIfPossible() {}
+
   // Implementation of AnimationDelegate:
   virtual void NotifyAnimationStarted(base::TimeTicks monotonic_time,
                                       Animation::TargetProperty target_property)