Enhanced the InkDropRippleImpl to create/destroy InkDropAnimations as needed.

ui/views/animation/ink_drop_animation_controller.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_INK_DROP_ANIMATION_CONTROLLER_H_
 #define UI_VIEWS_ANIMATION_INK_DROP_ANIMATION_CONTROLLER_H_
 
 #include "base/memory/scoped_ptr.h"
 #include "base/time/time.h"
 #include "ui/compositor/layer_tree_owner.h"
@@ skipping 11 matching lines @@
 
 // Pure virtual base class that manages an ink drop animation's lifetime and
 // state.
 class VIEWS_EXPORT InkDropAnimationController {
  public:
   virtual ~InkDropAnimationController() {}
 
   // Gets the current state of the ink drop.
   virtual InkDropState GetInkDropState() const = 0;
 
   // Animates from the current InkDropState to |state|.

[varkha, 2015/10/06 20:58:38]

nit: s/state/ink_drop_state?

[bruthig, 2015/10/08 21:42:55]

Done.

-  virtual void AnimateToState(InkDropState state) = 0;
+  virtual void AnimateToState(InkDropState ink_drop_state) = 0;
 
   virtual gfx::Size GetInkDropLargeSize() const = 0;
 
   // Sets the different sizes of the ink drop.
   virtual void SetInkDropSize(const gfx::Size& large_size,
                               int large_corner_radius,
                               const gfx::Size& small_size,
                               int small_corner_radius) = 0;
 
   // Sets the |center_point| of the ink drop relative to its parent Layer.
   virtual void SetInkDropCenter(const gfx::Point& center_point) = 0;
 
  protected:
   InkDropAnimationController() {}
 
  private:
   DISALLOW_COPY_AND_ASSIGN(InkDropAnimationController);
 };
 
 }  // namespace views
 
 #endif  // UI_VIEWS_ANIMATION_INK_DROP_ANIMATION_CONTROLLER_H_