arc: Make ChromeVox read an ARC custom notification

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 43 matching lines @@
   bool should_make_spoken_feedback_for_popup_updates;
   bool clickable;
 #if defined(OS_CHROMEOS)
   // Flag if the notification is pinned. If true, the notification is pinned
   // and user can't remove it.
   bool pinned;
 #endif  // defined(OS_CHROMEOS)
   std::vector<int> vibration_pattern;
   bool renotify;
   bool silent;
+  base::string16 accessible_name;
 };
 
 class MESSAGE_CENTER_EXPORT Notification {
  public:
   Notification(NotificationType type,
                const std::string& id,
                const base::string16& title,
                const base::string16& message,
                const gfx::Image& icon,
                const base::string16& display_source,
@@ skipping 142 matching lines @@
 #if defined(OS_CHROMEOS)
     return optional_fields_.pinned;
 #else
     return false;
 #endif  // defined(OS_CHROMEOS)
   }
 #if defined(OS_CHROMEOS)
   void set_pinned(bool pinned) { optional_fields_.pinned = pinned; }
 #endif  // defined(OS_CHROMEOS)
 
+  // Gets a text for spoken feedback.
+  base::string16 accessible_name() const {

[xiyuan, 2016/09/07 16:26:08]

nit: const base::string16& to avoid copying ?

[yhanada, 2016/09/08 03:37:23]

Done.

+    return optional_fields_.accessible_name;
+  }
+
   NotificationDelegate* delegate() const { return delegate_.get(); }
 
   const RichNotificationData& rich_notification_data() const {
     return optional_fields_;
   }
 
   // Set the priority to SYSTEM. The system priority user needs to call this
   // method explicitly, to avoid setting it accidentally.
   void SetSystemPriority();
 
@@ skipping 43 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_