Allow partial update for notification update API

chrome/browser/notifications/sync_notifier/synced_notification_unittest.cc

 // 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.
 
 #include <string>
 
 #include "base/memory/scoped_ptr.h"
 #include "base/message_loop/message_loop.h"
 #include "base/strings/utf_string_conversions.h"
 #include "chrome/browser/notifications/notification.h"
@@ skipping 40 matching lines @@
   // Adds a notification to be displayed. Virtual for unit test override.
   virtual void Add(const Notification& notification, Profile* profile)
       OVERRIDE {
     // Make a deep copy of the notification that we can inspect.
     notification_ = notification;
     profile_ = profile;
   }
 
   // Returns true if any notifications match the supplied ID, either currently
   // displayed or in the queue.
-  virtual bool DoesIdExist(const std::string& id) OVERRIDE {
-    return true;
+  virtual const Notification* FindById(const std::string& id) const OVERRIDE {
+    return (notification_.id() == id) ? &notification_ : NULL;
   }
 
   // Removes any notifications matching the supplied ID, either currently
   // displayed or in the queue.  Returns true if anything was removed.
   virtual bool CancelById(const std::string& notification_id) OVERRIDE {
     dismissed_id_ = notification_id;
     return true;
   }
 
   virtual std::set<std::string> GetAllIdsByProfileAndSourceOrigin(
@@ skipping 342 matching lines @@
 
   notification1_->QueueBitmapFetchJobs(&notification_manager, NULL, NULL);
 
   // There should be 4 urls in the queue, icon, image, and two buttons.
   EXPECT_EQ(4, notification1_->active_fetcher_count_);
 }
 
 // TODO(petewil): Add a test for a notification being read and or deleted.
 
 }  // namespace notifier