Make SingleThreadProxy a SchedulerClient

cc/trees/layer_tree_host_unittest_animation.cc

Index: cc/trees/layer_tree_host_unittest_animation.cc
diff --git a/cc/trees/layer_tree_host_unittest_animation.cc b/cc/trees/layer_tree_host_unittest_animation.cc
index 1542a1417b42e508f348affaee33d551e905246b..3b2de64a29c5d3128fcab9cf06d5166d37f8ece3 100644
--- a/cc/trees/layer_tree_host_unittest_animation.cc
+++ b/cc/trees/layer_tree_host_unittest_animation.cc
@@ -726,9 +726,7 @@ class LayerTreeHostAnimationTestContinuousAnimate
     : public LayerTreeHostAnimationTest {
  public:
   LayerTreeHostAnimationTestContinuousAnimate()
-      : num_commit_complete_(0),
-        num_draw_layers_(0) {
-  }
+      : num_commit_complete_(0), num_draw_layers_(0), have_animated_(false) {}
 
   virtual void SetupTree() OVERRIDE {
     LayerTreeHostAnimationTest::SetupTree();
@@ -747,6 +745,7 @@ class LayerTreeHostAnimationTestContinuousAnimate
     if (num_draw_layers_ == 2)
       return;
     layer_tree_host()->SetNeedsAnimate();
+    have_animated_ = true;
   }
 
   virtual void Layout() OVERRIDE {
@@ -767,16 +766,18 @@ class LayerTreeHostAnimationTestContinuousAnimate
   virtual void AfterTest() OVERRIDE {
     // Check that we didn't commit twice between first and second draw.
     EXPECT_EQ(1, num_commit_complete_);
+    EXPECT_TRUE(have_animated_);
   }
 
  private:
   int num_commit_complete_;
   int num_draw_layers_;
+  bool have_animated_;
   FakeContentLayerClient client_;
   scoped_refptr<FakeContentLayer> content_;
 };
 
-MULTI_THREAD_TEST_F(LayerTreeHostAnimationTestContinuousAnimate);
+SINGLE_AND_MULTI_THREAD_TEST_F(LayerTreeHostAnimationTestContinuousAnimate);
 
 class LayerTreeHostAnimationTestCancelAnimateCommit
     : public LayerTreeHostAnimationTest {