Adds the contextMessage field to 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 28 matching lines @@
 
   // The large icon associated with the notification, on the left side.
   base::scoped_nsobject<NSImageView> icon_;
 
   // The title of the message.
   base::scoped_nsobject<NSTextField> title_;
 
   // Body text of the message. Hidden for list notifications.
   base::scoped_nsobject<NSTextField> message_;
 
+  // Context-giving text of the message.  Alternate font used to distinguish it.
+  base::scoped_nsobject<NSTextField> contextMessage_;
+
   // Container for optional list item views.
   base::scoped_nsobject<NSView> listItemView_;
 
   // Container for optional progress bar view.
   base::scoped_nsobject<NSProgressIndicator> progressBarView_;
 
   // Container for optional items at the bottom of the notification.
   base::scoped_nsobject<NSView> bottomView_;
 }
 
@@ skipping 19 matching lines @@
 // Called when the user clicks within the notification view.
 - (void)notificationClicked;
 
 @end
 
 @interface MCNotificationController (TestingInterface)
 - (NSImageView*)iconView;
 @end
 
 #endif  // UI_MESSAGE_CENTER_COCOA_NOTIFICATION_CONTROLLER_H_