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

ui/keyboard/keyboard_controller_unittest.cc

Index: ui/keyboard/keyboard_controller_unittest.cc
diff --git a/ui/keyboard/keyboard_controller_unittest.cc b/ui/keyboard/keyboard_controller_unittest.cc
index 3e3418e421a8c723dfe1712f09201106b97e9086..22fa5e7a13ccfa0a4b2c7b31dec0d4cab9f27f28 100644
--- a/ui/keyboard/keyboard_controller_unittest.cc
+++ b/ui/keyboard/keyboard_controller_unittest.cc
@@ -40,13 +40,13 @@ void RunAnimationForLayer(ui::Layer* layer) {
             ui::ScopedAnimationDurationScaleMode::ZERO_DURATION);
 
   ui::LayerAnimatorTestController controller(layer->GetAnimator());
-  gfx::AnimationContainerElement* element = layer->GetAnimator();
   // Multiple steps are required to complete complex animations.
   // TODO(vollick): This should not be necessary. crbug.com/154017
   while (controller.animator()->is_animating()) {
     controller.StartThreadedAnimationsIfNeeded();
     base::TimeTicks step_time = controller.animator()->last_step_time();
-    element->Step(step_time + base::TimeDelta::FromMilliseconds(1000));
+    controller.animator()->Step(step_time +
+                                base::TimeDelta::FromMilliseconds(1000));
   }
 }