Adds a small icon to notifications, and connects it to synced notifications.

ui/message_center/cocoa/notification_controller.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_COCOA_NOTIFICATION_CONTROLLER_H_
 #define UI_MESSAGE_CENTER_COCOA_NOTIFICATION_CONTROLLER_H_
 
 #import <Cocoa/Cocoa.h>
 
 #include <string>
@@ skipping 19 matching lines @@
 
   // A copy of the notification ID.
   std::string notificationID_;
 
   // Controller of the notifications, where action messages are forwarded. Weak.
   message_center::MessageCenter* messageCenter_;
 
   // The button that invokes |-close:|, in the upper-right corner.
   base::scoped_nsobject<HoverImageButton> closeButton_;
 
+  // The small icon associated with the notification, on the bottom right.
+  base::scoped_nsobject<NSImageView> smallImage_;
+
   // The large icon associated with the notification, on the left side.
   base::scoped_nsobject<NSImageView> icon_;
 
   // The title of the message.
   base::scoped_nsobject<NSTextView> title_;
 
   // Body text of the message. Hidden for list notifications.
   base::scoped_nsobject<NSTextView> message_;
 
   // Context-giving text of the message.  Alternate font used to distinguish it.
@@ skipping 27 matching lines @@
 // rather than the model object, so it's safe to use after the Notification has
 // been deleted.
 - (const std::string&)notificationID;
 
 // Called when the user clicks within the notification view.
 - (void)notificationClicked;
 
 @end
 
 @interface MCNotificationController (TestingInterface)
+- (NSImageView*)smallImageView;
 - (NSImageView*)iconView;
 @end
 
 #endif  // UI_MESSAGE_CENTER_COCOA_NOTIFICATION_CONTROLLER_H_