MD - add ripples to DL shelf items

ui/views/animation/button_ink_drop_delegate.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_BUTTON_INK_DROP_DELEGATE_H_
 #define UI_VIEWS_ANIMATION_BUTTON_INK_DROP_DELEGATE_H_
 
 #include "base/macros.h"
 #include "base/memory/scoped_ptr.h"
 #include "ui/events/event_handler.h"
+#include "ui/gfx/geometry/point.h"
 #include "ui/views/animation/ink_drop_delegate.h"
 #include "ui/views/views_export.h"
 
 namespace ui {
 class ScopedTargetHandler;
 }
 
 namespace views {
 
 class InkDropAnimationController;
 class InkDropHost;
 class View;
 
 // An InkDropDelegate that handles animations for things that act like buttons.
 class VIEWS_EXPORT ButtonInkDropDelegate : public InkDropDelegate,
                                            public ui::EventHandler {
  public:
   ButtonInkDropDelegate(InkDropHost* ink_drop_host, View* view);
   ~ButtonInkDropDelegate() override;
 
+  const gfx::Point& last_ink_drop_location() const {
+    return last_ink_drop_location_;
+  }
+  void set_last_ink_drop_location(const gfx::Point& point) {
+    last_ink_drop_location_ = point;
+  }
+
   // InkDropDelegate:
   void OnAction(InkDropState state) override;
   void SnapToActivated() override;
   void SetHovered(bool is_hovered) override;
 
   // ui::EventHandler:
   void OnMouseEvent(ui::MouseEvent* event) override;
   void OnGestureEvent(ui::GestureEvent* event) override;
 
  private:
   // An instance of ScopedTargetHandler allowing |this| to handle events.
   scoped_ptr<ui::ScopedTargetHandler> target_handler_;
 
   // Parent InkDropHost (typically a View) that hosts the ink ripple animations.
   InkDropHost* ink_drop_host_;
 
+  // Location of the last ink drop triggering event in coordinate system of the
+  // ctor argument |view|.
+  gfx::Point last_ink_drop_location_;
+
   // Animation controller for the ink drop ripple effect.
   scoped_ptr<InkDropAnimationController> ink_drop_animation_controller_;
 
   DISALLOW_COPY_AND_ASSIGN(ButtonInkDropDelegate);
 };
 
 }  // namespace views
 
 #endif  // UI_VIEWS_ANIMATION_BUTTON_INK_DROP_DELEGATE_H_