compositor: Tick the UI animations from cc, instead of from timer callbacks.

ui/aura/window_unittest.cc

Index: ui/aura/window_unittest.cc
diff --git a/ui/aura/window_unittest.cc b/ui/aura/window_unittest.cc
index 5e08a170da097f9d34b11acccb75a0bce6ed295e..fa5ce404250f86e796371069ea0069f79077cbf8 100644
--- a/ui/aura/window_unittest.cc
+++ b/ui/aura/window_unittest.cc
@@ -1625,7 +1625,7 @@ TEST_F(WindowTest, SetBoundsInternalShouldCheckTargetBounds) {
 
   EXPECT_FALSE(!w1->layer());
   w1->layer()->GetAnimator()->set_disable_timer_for_test(true);
-  gfx::AnimationContainerElement* element = w1->layer()->GetAnimator();
+  ui::LayerAnimator* animator = w1->layer()->GetAnimator();
 
   EXPECT_EQ("0,0 100x100", w1->bounds().ToString());
   EXPECT_EQ("0,0 100x100", w1->layer()->GetTargetBounds().ToString());
@@ -1655,7 +1655,7 @@ TEST_F(WindowTest, SetBoundsInternalShouldCheckTargetBounds) {
   base::TimeTicks start_time =
       w1->layer()->GetAnimator()->last_step_time();
 
-  element->Step(start_time + base::TimeDelta::FromMilliseconds(1000));
+  animator->Step(start_time + base::TimeDelta::FromMilliseconds(1000));
 
   EXPECT_EQ("0,0 100x100", w1->bounds().ToString());
 }
@@ -2374,8 +2374,8 @@ TEST_F(WindowTest, DelegateNotifiedAsBoundsChange) {
   // Animate to the end, which should notify of the change.
   base::TimeTicks start_time =
       window->layer()->GetAnimator()->last_step_time();
-  gfx::AnimationContainerElement* element = window->layer()->GetAnimator();
-  element->Step(start_time + base::TimeDelta::FromMilliseconds(1000));
+  ui::LayerAnimator* animator = window->layer()->GetAnimator();
+  animator->Step(start_time + base::TimeDelta::FromMilliseconds(1000));
   EXPECT_TRUE(delegate.bounds_changed());
   EXPECT_NE("0,0 100x100", window->bounds().ToString());
 }
@@ -2416,8 +2416,8 @@ TEST_F(WindowTest, DelegateNotifiedAsBoundsChangeInHiddenLayer) {
   // Animate to the end: will *not* notify of the change since we are hidden.
   base::TimeTicks start_time =
       window->layer()->GetAnimator()->last_step_time();
-  gfx::AnimationContainerElement* element = window->layer()->GetAnimator();
-  element->Step(start_time + base::TimeDelta::FromMilliseconds(1000));
+  ui::LayerAnimator* animator = window->layer()->GetAnimator();
+  animator->Step(start_time + base::TimeDelta::FromMilliseconds(1000));
 
   // No bounds changed notification at the end of animation since layer
   // delegate is NULL.