Make the material design ripple effect more visible on a quick action (single click or single tap)

ui/compositor/test/layer_animator_test_controller.h

 // Copyright (c) 2013 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #ifndef UI_COMPOSITOR_TEST_LAYER_ANIMATOR_TEST_CONTROLLER_H_
 #define UI_COMPOSITOR_TEST_LAYER_ANIMATOR_TEST_CONTROLLER_H_
 
 #include "ui/compositor/layer_animator.h"
 
 namespace ui {
 
 // Allows tests to access sequences owned by the animator.
 class LayerAnimatorTestController {
  public:
   LayerAnimatorTestController(scoped_refptr<LayerAnimator> animator);
 
   ~LayerAnimatorTestController();
 
   LayerAnimator* animator() { return animator_.get(); }
 
   // Returns the running sequence animating the given property, if any.
   LayerAnimationSequence* GetRunningSequence(
       LayerAnimationElement::AnimatableProperty property);
 
   // Starts threaded animations that are waiting for an effective start time.
   void StartThreadedAnimationsIfNeeded();
 
+  // Progresses all running animations by the given |duration|.
+  void Step(const base::TimeDelta& duration);
+
  private:
   scoped_refptr<LayerAnimator> animator_;
 };
 
 }  // namespace ui
 
 #endif  // UI_COMPOSITOR_TEST_LAYER_ANIMATOR_TEST_CONTROLLER_H_