Allow partial update for notification update API

chrome/browser/notifications/message_center_notification_manager.cc

 // 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/message_center_notification_manager.h"
 
 #include "base/logging.h"
 #include "base/memory/scoped_ptr.h"
 #include "base/prefs/pref_service.h"
 #include "chrome/browser/extensions/extension_info_map.h"
@@ skipping 46 matching lines @@
 #endif
 }
 
 MessageCenterNotificationManager::~MessageCenterNotificationManager() {
   message_center_->RemoveObserver(this);
 }
 
 ////////////////////////////////////////////////////////////////////////////////
 // NotificationUIManager
 
-bool MessageCenterNotificationManager::DoesIdExist(const std::string& id) {
-  if (NotificationUIManagerImpl::DoesIdExist(id))
+bool MessageCenterNotificationManager::DoesIdExist(
+    const std::string& id, Notification* matched_notification) {
+  if (NotificationUIManagerImpl::DoesIdExist(id, matched_notification))
     return true;
   NotificationMap::iterator iter = profile_notifications_.find(id);
   if (iter == profile_notifications_.end())
     return false;
+  if (matched_notification)
+    *matched_notification = iter->second->notification();
   return true;
 }
 
 bool MessageCenterNotificationManager::CancelById(const std::string& id) {
   // See if this ID hasn't been shown yet.
   if (NotificationUIManagerImpl::CancelById(id))
     return true;
 
   // If it has been shown, remove it.
   NotificationMap::iterator iter = profile_notifications_.find(id);
@@ skipping 441 matching lines @@
 
 MessageCenterNotificationManager::ProfileNotification*
     MessageCenterNotificationManager::FindProfileNotification(
         const std::string& id) const {
   NotificationMap::const_iterator iter = profile_notifications_.find(id);
   if (iter == profile_notifications_.end())
     return NULL;
 
   return (*iter).second;
 }