Add MD Ink Drop Layers to InkDropHost only when a ripple/hover is active.

ui/views/animation/test/ink_drop_animation_test_api.h

 // Copyright 2015 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_VIEWS_ANIMATION_TEST_INK_DROP_ANIMATION_TEST_API_H_
 #define UI_VIEWS_ANIMATION_TEST_INK_DROP_ANIMATION_TEST_API_H_
 
 #include <vector>
 
 #include "base/macros.h"
-#include "base/time/time.h"
 #include "ui/compositor/test/multi_layer_animator_test_controller.h"
 #include "ui/compositor/test/multi_layer_animator_test_controller_delegate.h"
 
 namespace ui {
 class LayerAnimator;
 }  // namespace ui
 
 namespace views {
 class InkDropAnimation;
 
@@ skipping 27 matching lines @@
   // The InkDropedAnimation to provide internal access to.
   InkDropAnimation* ink_drop_animation_;
 
   DISALLOW_COPY_AND_ASSIGN(InkDropAnimationTestApi);
 };
 
 }  // namespace test
 }  // namespace views
 
 #endif  // UI_VIEWS_ANIMATION_TEST_INK_DROP_ANIMATION_TEST_API_H_