Start building message_center on Mac.

chrome/browser/notifications/notification_ui_manager_mac.mm

 // Copyright (c) 2012 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.
 
 #include "chrome/browser/notifications/notification_ui_manager_mac.h"
 
 #include "base/mac/cocoa_protocols.h"
 #include "base/mac/mac_util.h"
 #include "base/sys_string_conversions.h"
 #include "chrome/browser/notifications/notification.h"
 #include "chrome/browser/notifications/balloon_notification_ui_manager.h"
 
+#if defined(ENABLE_MESSAGE_CENTER)
+#include "chrome/browser/browser_process.h"
+#include "chrome/browser/notifications/message_center_notification_manager.h"
+#include "ui/message_center/message_center_util.h"
+#endif
+
 @class NSUserNotificationCenter;
 
 // Since NSUserNotification and NSUserNotificationCenter are new classes in
 // 10.8, they cannot simply be declared with an @interface. An @implementation
 // is needed to link, but providing one would cause a runtime conflict when
 // running on 10.8. Instead, provide the interface defined as a protocol and
 // use that instead, because sizeof(id<Protocol>) == sizeof(Class*). In order to
 // instantiate, use NSClassFromString and simply assign the alloc/init'd result
 // to an instance of the proper protocol. This way the compiler, linker, and
 // loader are all happy. And the code isn't full of objc_msgSend.
@@ skipping 64 matching lines @@
 
 NotificationUIManagerMac::ControllerNotification::~ControllerNotification() {
   [view release];
   delete model;
 }
 
 ////////////////////////////////////////////////////////////////////////////////
 
 // static
 NotificationUIManager* NotificationUIManager::Create(PrefService* local_state) {
+#if defined(ENABLE_MESSAGE_CENTER)
+  // TODO(rsesek): Remove this function and merge it with the one in
+  // notification_ui_manager.cc.
+  if (DelegatesToMessageCenter()) {
+    return new MessageCenterNotificationManager(
+        g_browser_process->message_center());
+  }
+#endif
+
   BalloonNotificationUIManager* balloon_manager = NULL;
   if (base::mac::IsOSMountainLionOrLater())
     balloon_manager = new NotificationUIManagerMac(local_state);
   else
     balloon_manager = new BalloonNotificationUIManager(local_state);
   balloon_manager->SetBalloonCollection(BalloonCollection::Create());
   return balloon_manager;
 }
 
 NotificationUIManagerMac::NotificationUIManagerMac(PrefService* local_state)
@@ skipping 191 matching lines @@
     notification->Click();
 }
 
 - (BOOL)userNotificationCenter:(NSUserNotificationCenter*)center
      shouldPresentNotification:(id<CrUserNotification>)nsNotification {
   // Always display notifications, regardless of whether the app is foreground.
   return YES;
 }
 
 @end