Make SingleThreadProxy a SchedulerClient

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 b11196391911db7ef4688701f7abbac617aa5f12..35e82c6d46fc061dec3f01bbc08419b232d25cb6 100644
--- a/cc/test/layer_tree_test.h
+++ b/cc/test/layer_tree_test.h
@@ -71,8 +71,6 @@ class TestHooks : public AnimationDelegate {
   virtual void DidCommit() {}
   virtual void DidCommitAndDrawFrame() {}
   virtual void DidCompleteSwapBuffers() {}
-  virtual void ScheduleComposite() {}
-  virtual void ScheduleAnimation() {}
   virtual void DidDeferCommit() {}
   virtual void DidSetVisibleOnImplTree(LayerTreeHostImpl* host_impl,
                                        bool visible) {}
@@ -138,8 +136,6 @@ class LayerTreeTest : public testing::Test, public TestHooks {
 
   virtual void InitializeSettings(LayerTreeSettings* settings) {}
 
-  virtual void ScheduleComposite() OVERRIDE;
-
   void RealEndTest();
 
   virtual void DispatchAddAnimation(Layer* layer_to_receive_animation,
@@ -150,7 +146,6 @@ class LayerTreeTest : public testing::Test, public TestHooks {
   void DispatchSetNeedsRedrawRect(const gfx::Rect& damage_rect);
   void DispatchSetVisible(bool visible);
   void DispatchSetNextCommitForcesRedraw();
-  void DispatchComposite();
   void DispatchDidAddAnimation();
 
   virtual void AfterTest() = 0;
@@ -203,7 +198,6 @@ class LayerTreeTest : public testing::Test, public TestHooks {
   bool end_when_begin_returns_;
   bool timed_out_;
   bool scheduled_;
-  bool schedule_when_set_visible_true_;
   bool started_;
   bool ended_;
   bool delegating_renderer_;