Plumb through notification action types and placeholders on Android

ui/message_center/notification.h

 // Copyright (c) 2013 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_MESSAGE_CENTER_NOTIFICATION_H_
 #define UI_MESSAGE_CENTER_NOTIFICATION_H_
 
 #include <stddef.h>
 
 #include <string>
@@ skipping 11 matching lines @@
 
 namespace message_center {
 
 struct MESSAGE_CENTER_EXPORT NotificationItem {
   base::string16 title;
   base::string16 message;
 
   NotificationItem(const base::string16& title, const base::string16& message);
 };
 
+enum class ButtonType { BUTTON, TEXT };
+
 struct MESSAGE_CENTER_EXPORT ButtonInfo {
   base::string16 title;
   gfx::Image icon;
+  ButtonType type = ButtonType::BUTTON;
+  base::string16 placeholder;
 
-  ButtonInfo(const base::string16& title);
+  explicit ButtonInfo(const base::string16& title);
+  ButtonInfo(const ButtonInfo& other);
+  ~ButtonInfo();
+  ButtonInfo& operator=(const ButtonInfo& other);
 };
 
 class MESSAGE_CENTER_EXPORT RichNotificationData {
  public:
   RichNotificationData();
   RichNotificationData(const RichNotificationData& other);
   ~RichNotificationData();
 
   int priority;
   bool never_timeout;
@@ skipping 238 matching lines @@
   bool is_read_;  // True if this has been seen in the message center.
 
   // A proxy object that allows access back to the JavaScript object that
   // represents the notification, for firing events.
   scoped_refptr<NotificationDelegate> delegate_;
 };
 
 }  // namespace message_center
 
 #endif  // UI_MESSAGE_CENTER_NOTIFICATION_H_