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..5f82dafcd5a725fa2766634afbcbd8e5176c9a0b 100644
--- a/cc/test/layer_tree_test.h
+++ b/cc/test/layer_tree_test.h
@@ -78,6 +78,25 @@ class TestHooks : public AnimationDelegate {
                                        bool visible) {}
   virtual base::TimeDelta LowFrequencyAnimationInterval() const;
 
+  // Hooks for SchedulerClient.

[brianderson, 2014/05/20 21:56:28]

I would say this makes more sense in the ThreadProxyLayerTreeTest today, but
since the SingleThreadProxy will also have these soon, we might as well just put
them here.

+  virtual void SetNeedsBeginFrame(bool enable) {}
+  virtual void WillBeginImplFrame(const BeginFrameArgs& args) {}
+  virtual void ScheduledActionSendBeginMainFrame() {}
+  virtual DrawResult ScheduledActionDrawAndSwapIfPossible();
+  virtual DrawResult ScheduledActionDrawAndSwapForced();
+  virtual DrawResult ScheduledActionDrawAndReadback();
+  virtual void ScheduledActionAnimate() {}
+  virtual void ScheduledActionCommit() {}
+  virtual void ScheduledActionUpdateVisibleTiles() {}
+  virtual void ScheduledActionActivatePendingTree() {}
+  virtual void ScheduledActionBeginOutputSurfaceCreation() {}
+  virtual void ScheduledActionManageTiles() {}
+  virtual void DidAnticipatedDrawTimeChange(base::TimeTicks time) {}
+  virtual base::TimeDelta DrawDurationEstimate();
+  virtual base::TimeDelta BeginMainFrameToCommitDurationEstimate();
+  virtual base::TimeDelta CommitToActivateDurationEstimate();
+  virtual void DidBeginImplFrameDeadline() {}
+
   // Implementation of AnimationDelegate:
   virtual void NotifyAnimationStarted(base::TimeTicks monotonic_time,
                                       Animation::TargetProperty target_property)