DriveFileSyncService listens to OnNetworkConnected event to restart synchronization

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>
@@ skipping 70 matching lines @@
   // 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;
+  virtual void OnNetworkConnected() OVERRIDE;
 
  private:
   friend class DriveFileSyncServiceTest;
   class TaskToken;
   struct ProcessRemoteChangeParam;
 
   enum RemoteSyncType {
     // Smaller number indicates higher priority in ChangeQueue.
     REMOTE_SYNC_TYPE_INCREMENTAL = 0,
     REMOTE_SYNC_TYPE_BATCH = 1,
@@ skipping 70 matching lines @@
   // |task_description| is optional but should give human-readable
   // messages that describe the task that is acquiring the token.
   scoped_ptr<TaskToken> GetToken(const tracked_objects::Location& from_here,
                                  TaskType task_type,
                                  const std::string& task_description);
   void NotifyTaskDone(fileapi::SyncStatusCode status,
                       scoped_ptr<TaskToken> token);
   void UpdateServiceState();
   base::WeakPtr<DriveFileSyncService> AsWeakPtr();
 
-
   void DidGetRemoteFileMetadata(
       const fileapi::SyncFileMetadataCallback& callback,
       google_apis::GDataErrorCode error,
       scoped_ptr<google_apis::DocumentEntry> entry);
 
   SyncOperationType ResolveSyncOperationType(
       const fileapi::FileChange& local_file_change,
       const fileapi::FileSystemURL& url);
 
   void DidApplyLocalChange(scoped_ptr<TaskToken> token,
@@ skipping 144 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_