Use MD-style focus indicator on DL shelf items.

ui/views/controls/button/custom_button.h

 // Copyright (c) 2012 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_CONTROLS_BUTTON_CUSTOM_BUTTON_H_
 #define UI_VIEWS_CONTROLS_BUTTON_CUSTOM_BUTTON_H_
 
 #include "base/macros.h"
 #include "base/memory/scoped_ptr.h"
 #include "ui/events/event_constants.h"
@@ skipping 14 matching lines @@
  public:
   // An enum describing the events on which a button should notify its listener.
   enum NotifyAction {
     NOTIFY_ON_PRESS,
     NOTIFY_ON_RELEASE,
   };
 
   // The menu button's class name.
   static const char kViewClassName[];
 
-  static const CustomButton* AsCustomButton(const views::View* view);
-  static CustomButton* AsCustomButton(views::View* view);
+  static const CustomButton* AsCustomButton(const View* view);
+  static CustomButton* AsCustomButton(View* view);
+
+  // Paint an MD-style focus ring on the given canvas at the given bounds.
+  static void PaintMdFocusRing(gfx::Canvas* canvas, View* view);
 
   ~CustomButton() override;
 
   // Get/sets the current display state of the button.
   ButtonState state() const { return state_; }
   void SetState(ButtonState state);
 
   // Starts throbbing. See HoverAnimation for a description of cycles_til_stop.
   void StartThrobbing(int cycles_til_stop);
 
@@ skipping 153 matching lines @@
   // because it needs to paint to a layer so it can extend beyond the bounds of
   // |this|.
   views::View* md_focus_ring_;
 
   DISALLOW_COPY_AND_ASSIGN(CustomButton);
 };
 
 }  // namespace views
 
 #endif  // UI_VIEWS_CONTROLS_BUTTON_CUSTOM_BUTTON_H_