DriveFileSyncService listens to OnAuthenticated event to recover from unavailable state

chrome/browser/sync_file_system/drive_file_sync_service.h

 // 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.
 
 #ifndef CHROME_BROWSER_SYNC_FILE_SYSTEM_DRIVE_FILE_SYNC_SERVICE_H_
 #define CHROME_BROWSER_SYNC_FILE_SYSTEM_DRIVE_FILE_SYNC_SERVICE_H_
 
 #include <deque>
 #include <map>
 #include <set>
 #include <string>
 #include <vector>
 
 #include "base/callback_forward.h"
 #include "base/memory/scoped_ptr.h"
 #include "base/memory/weak_ptr.h"
 #include "base/observer_list.h"
 #include "base/threading/non_thread_safe.h"
 #include "chrome/browser/google_apis/drive_service_interface.h"
+#include "chrome/browser/sync_file_system/drive_file_sync_client.h"
 #include "chrome/browser/sync_file_system/local_change_processor.h"
 #include "chrome/browser/sync_file_system/remote_file_sync_service.h"
 #include "webkit/fileapi/syncable/file_change.h"
 #include "webkit/fileapi/syncable/sync_callbacks.h"
 
 namespace google_apis {
 class DocumentFeed;
 }
 
 namespace tracked_objects {
 class Location;
 }
 
 namespace sync_file_system {
 
-class DriveFileSyncClient;
 class DriveMetadataStore;
 
 // Maintains remote file changes.
 // Owned by SyncFileSystemService (which is a per-profile object).
 class DriveFileSyncService
     : public RemoteFileSyncService,
       public LocalChangeProcessor,
+      public DriveFileSyncClientObserver,
       public base::NonThreadSafe {
  public:
   static const char kServiceName[];
 
   explicit DriveFileSyncService(Profile* profile);
   virtual ~DriveFileSyncService();
 
   // Creates DriveFileSyncClient instance for testing.
   // |metadata_store| must be initialized beforehand.
   static scoped_ptr<DriveFileSyncService> CreateForTesting(
@@ skipping 22 matching lines @@
   virtual RemoteServiceState GetCurrentState() const OVERRIDE;
 
   // LocalChangeProcessor overrides.
   virtual void ApplyLocalChange(
       const fileapi::FileChange& change,
       const FilePath& local_file_path,
       const fileapi::SyncFileMetadata& local_file_metadata,
       const fileapi::FileSystemURL& url,
       const fileapi::SyncStatusCallback& callback) OVERRIDE;
 
+  // DriveFileSyncClientObserver overrides.
+  virtual void OnAuthenticated() OVERRIDE;
+
  private:
   friend class DriveFileSyncServiceTest;
   class TaskToken;
 
   struct ChangeQueueItem {
     int64 changestamp;
     fileapi::FileSystemURL url;
 
     ChangeQueueItem();
     ChangeQueueItem(int64 changestamp, const fileapi::FileSystemURL& url);
@@ skipping 157 matching lines @@
   // Use WeakPtrFactory instead of SupportsWeakPtr to revoke the weak pointer
   // in |token_|.
   base::WeakPtrFactory<DriveFileSyncService> weak_factory_;
 
   DISALLOW_COPY_AND_ASSIGN(DriveFileSyncService);
 };
 
 }  // namespace sync_file_system
 
 #endif  // CHROME_BROWSER_SYNC_FILE_SYSTEM_DRIVE_FILE_SYNC_SERVICE_H_