Show progress bar notifications for Mac.

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 31 matching lines @@
 
   // The title of the message.
   base::scoped_nsobject<NSTextField> title_;
 
   // Body text of the message.
   base::scoped_nsobject<NSTextField> message_;
 
   // 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_;
 }
 
 // Creates a new controller for a given notification.
 - (id)initWithNotification:(const message_center::Notification*)notification
     messageCenter:(message_center::MessageCenter*)messageCenter;
 
 // If the model object changes, this method will update the views to reflect
 // the new model object. Returns the updated frame of the notification.
@@ skipping 13 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_