Support buttons on ARC Notifications

ui/arc/notification/arc_notification_item.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_ARC_NOTIFICATION_ARC_NOTIFICATION_ITEM_H_
 #define UI_ARC_NOTIFICATION_ARC_NOTIFICATION_ITEM_H_
 
 #include <string>
 
 #include "base/macros.h"
@@ skipping 17 matching lines @@
   ~ArcNotificationItem();
 
   void UpdateWithArcNotificationData(const ArcNotificationData& data);
 
   // Methods called from ArcNotificationManager:
   void OnClosedFromAndroid();
 
   // Methods called from ArcNotificationItemDelegate:
   void Close(bool by_user);
   void Click();
+  void ButtonClick(int button_index);
 
  private:
   void OnImageDecoded(const SkBitmap& bitmap);
 
   ArcNotificationManager* const manager_;
   message_center::MessageCenter* const message_center_;
   const AccountId profile_id_;
 
   const std::string notification_key_;
   const std::string notification_id_;
@@ skipping 16 matching lines @@
 
   base::ThreadChecker thread_checker_;
   base::WeakPtrFactory<ArcNotificationItem> weak_ptr_factory_;
 
   DISALLOW_COPY_AND_ASSIGN(ArcNotificationItem);
 };
 
 }  // namespace arc
 
 #endif  // UI_ARC_NOTIFICATION_ARC_NOTIFICATION_ITEM_H_