DriveFileSyncService listens to OnNetworkConnected event to restart synchronization

chrome/browser/sync_file_system/drive_file_sync_client.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_CLIENT_H_
 #define CHROME_BROWSER_SYNC_FILE_SYSTEM_DRIVE_FILE_SYNC_CLIENT_H_
 
 #include <string>
 
 #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/google_apis/drive_upload_error.h"
 #include "chrome/browser/google_apis/gdata_errorcode.h"
 #include "chrome/browser/google_apis/gdata_wapi_parser.h"
+#include "net/base/network_change_notifier.h"
 
 class GURL;
 class Profile;
 
 namespace google_apis {
 class DriveUploaderInterface;
 }
 
 namespace sync_file_system {
 
 class DriveFileSyncClientObserver {
  public:
   DriveFileSyncClientObserver() {}
   virtual ~DriveFileSyncClientObserver() {}
   virtual void OnAuthenticated() = 0;
+  virtual void OnNetworkConnected() = 0;
 
  private:
   DISALLOW_COPY_AND_ASSIGN(DriveFileSyncClientObserver);
 };
 
 // This class is responsible for talking to the Drive service to get and put
 // Drive directories, files and metadata.
 // This class is owned by DriveFileSyncService.
-class DriveFileSyncClient : public google_apis::DriveServiceObserver,
-                            public base::NonThreadSafe,
-                            public base::SupportsWeakPtr<DriveFileSyncClient> {
+class DriveFileSyncClient
+    : public google_apis::DriveServiceObserver,
+      public net::NetworkChangeNotifier::ConnectionTypeObserver,
+      public base::NonThreadSafe,
+      public base::SupportsWeakPtr<DriveFileSyncClient> {
  public:
   typedef base::Callback<void(google_apis::GDataErrorCode error)>
       GDataErrorCallback;
   typedef base::Callback<void(google_apis::GDataErrorCode error,
                               const std::string& file_md5)>
       DownloadFileCallback;
   typedef base::Callback<void(google_apis::GDataErrorCode error,
                               const std::string& resource_id,
                               const std::string& file_md5)>
       UploadFileCallback;
@@ skipping 106 matching lines @@
   // deleted from Drive. If |remote_file_md5| is different from the actual
   // value, cancels the deletion and invokes |callback| with
   // GDataErrorCode::HTTP_CONFLICT immediately.
   void DeleteFile(const std::string& resource_id,
                   const std::string& remote_file_md5,
                   const GDataErrorCallback& callback);
 
   // DriveServiceObserver overrides.
   virtual void OnReadyToPerformOperations() OVERRIDE;
 
+  // ConnectionTypeObserver overrides.
+  virtual void OnConnectionTypeChanged(
+      net::NetworkChangeNotifier::ConnectionType type) OVERRIDE;
+
  private:
   friend class DriveFileSyncClientTest;
   friend class DriveFileSyncServiceTest;
 
   // Constructor for test use.
   DriveFileSyncClient(
       Profile* profile,
       scoped_ptr<google_apis::DriveServiceInterface> drive_service,
       scoped_ptr<google_apis::DriveUploaderInterface> drive_uploader);
 
@@ skipping 76 matching lines @@
   scoped_ptr<google_apis::DriveUploaderInterface> drive_uploader_;
 
   ObserverList<DriveFileSyncClientObserver> observers_;
 
   DISALLOW_COPY_AND_ASSIGN(DriveFileSyncClient);
 };
 
 }  // namespace sync_file_system
 
 #endif  // CHROME_BROWSER_SYNC_FILE_SYSTEM_DRIVE_FILE_SYNC_CLIENT_H_