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

Index: ui/compositor/test/layer_animator_test_controller.h
diff --git a/ui/compositor/test/layer_animator_test_controller.h b/ui/compositor/test/layer_animator_test_controller.h
index 0f8d1e8a3a4735e03a9ba43710064bd633451c95..92798f330d56c6aee54c92c12b0690e7f4395fcd 100644
--- a/ui/compositor/test/layer_animator_test_controller.h
+++ b/ui/compositor/test/layer_animator_test_controller.h
@@ -25,6 +25,9 @@ class LayerAnimatorTestController {
   // 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_;
 };