[SyncFS] Add a UMA to measure RTT in registration

chrome/browser/sync_file_system/drive_backend/sync_engine.h

 // Copyright 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 CHROME_BROWSER_SYNC_FILE_SYSTEM_DRIVE_BACKEND_SYNC_ENGINE_H_
 #define CHROME_BROWSER_SYNC_FILE_SYSTEM_DRIVE_BACKEND_SYNC_ENGINE_H_
 
 #include <set>
 #include <string>
 
@@ skipping 145 matching lines @@
 
   SyncEngine(scoped_ptr<drive::DriveServiceInterface> drive_service,
              scoped_ptr<drive::DriveUploaderInterface> drive_uploader,
              base::SequencedTaskRunner* worker_task_runner,
              drive::DriveNotificationManager* notification_manager,
              ExtensionServiceInterface* extension_service,
              SigninManagerBase* signin_manager);
 
   void UpdateRegisteredApps();
 
+  static void DidRegisterOrigin(base::Time start_time,
+                                const SyncStatusCallback& callback,
+                                SyncStatusCode status);

[tzik, 2014/05/08 06:39:10]

Can this function move to anonymous namespace in .cc?

[peria, 2014/05/08 06:51:52]

Done.

+
   scoped_ptr<drive::DriveServiceInterface> drive_service_;
   scoped_ptr<drive::DriveUploaderInterface> drive_uploader_;
 
   // These external services are not owned by SyncEngine.
   // The owner of the SyncEngine is responsible for their lifetime.
   // I.e. the owner should declare the dependency explicitly by calling
   // KeyedService::DependsOn().
   drive::DriveNotificationManager* notification_manager_;
   ExtensionServiceInterface* extension_service_;
   SigninManagerBase* signin_manager_;
 
   ObserverList<SyncServiceObserver> service_observers_;
   ObserverList<FileStatusObserver> file_status_observers_;
 
   scoped_ptr<WorkerObserver> worker_observer_;
   scoped_ptr<SyncWorker> sync_worker_;
   scoped_refptr<base::SequencedTaskRunner> worker_task_runner_;
 
   base::WeakPtrFactory<SyncEngine> weak_ptr_factory_;
   DISALLOW_COPY_AND_ASSIGN(SyncEngine);
 };
 
 }  // namespace drive_backend
 }  // namespace sync_file_system
 
 #endif  // CHROME_BROWSER_SYNC_FILE_SYSTEM_DRIVE_BACKEND_SYNC_ENGINE_H_