Add ink drop ripple to overview mode button

ui/views/animation/ink_drop_host_view.h

 // Copyright 2016 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_HOST_VIEW_H_
 #define UI_VIEWS_ANIMATION_INK_DROP_HOST_VIEW_H_
 
 #include <memory>
 
 #include "third_party/skia/include/core/SkColor.h"
@@ skipping 91 matching lines @@
   InkDrop* GetInkDrop();
 
   // Returns an InkDropImpl configured to work well with a
   // flood-fill ink drop ripple.
   std::unique_ptr<InkDropImpl> CreateDefaultFloodFillInkDropImpl();
 
   // Returns an InkDropImpl with default configuration. The base implementation
   // of CreateInkDrop() delegates to this function.
   std::unique_ptr<InkDropImpl> CreateDefaultInkDropImpl();
 
+  InkDropMode ink_drop_mode() const { return ink_drop_mode_; }
+
  private:
   class InkDropGestureHandler;
   friend class InkDropGestureHandler;
   friend class test::InkDropHostViewTestApi;
 
   // The last user Event to trigger an ink drop ripple animation.
   std::unique_ptr<ui::LocatedEvent> last_ripple_triggering_event_;
 
   // Defines what type of |ink_drop_| to create.
   InkDropMode ink_drop_mode_;
@@ skipping 11 matching lines @@
   // drop layer.
   bool old_paint_to_layer_;
 
   bool destroying_;
 
   DISALLOW_COPY_AND_ASSIGN(InkDropHostView);
 };
 }  // namespace views
 
 #endif  // UI_VIEWS_ANIMATION_INK_DROP_HOST_VIEW_H_