Use SNAPSHOT sync mode for LocalSync

chrome/browser/sync_file_system/local/local_file_sync_service.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_LOCAL_LOCAL_FILE_SYNC_SERVICE_H_
 #define CHROME_BROWSER_SYNC_FILE_SYSTEM_LOCAL_LOCAL_FILE_SYNC_SERVICE_H_
 
 #include <map>
 #include <set>
 #include <string>
 
 #include "base/basictypes.h"
 #include "base/callback.h"
 #include "base/memory/ref_counted.h"
 #include "base/memory/weak_ptr.h"
 #include "base/observer_list.h"
 #include "chrome/browser/sync_file_system/local/local_origin_change_observer.h"
 #include "chrome/browser/sync_file_system/remote_change_processor.h"
 #include "chrome/browser/sync_file_system/sync_callbacks.h"
 #include "chrome/browser/sync_file_system/sync_status_code.h"
 
 class GURL;
 class Profile;
 
 namespace fileapi {
 class FileSystemContext;
 }
 
+namespace webkit_blob {
+class ScopedFile;
+}
+
 namespace sync_file_system {
 
 class FileChange;
 class LocalChangeProcessor;
 class LocalFileSyncContext;
 struct LocalFileSyncInfo;
 
 // Maintains local file change tracker and sync status.
 // Owned by SyncFileSystemService (which is a per-profile object).
 class LocalFileSyncService
@@ skipping 135 matching lines @@
       SyncStatusCode status);
 
   // Runs local_sync_callback_ and resets it.
   void RunLocalSyncCallback(
       SyncStatusCode status,
       const fileapi::FileSystemURL& url);
 
   // Callbacks for ProcessLocalChange.
   void DidGetFileForLocalSync(
       SyncStatusCode status,
-      const LocalFileSyncInfo& sync_file_info);
+      const LocalFileSyncInfo& sync_file_info,
+      scoped_ptr<webkit_blob::ScopedFile> snapshot);
   void ProcessNextChangeForURL(
+      scoped_ptr<webkit_blob::ScopedFile> snapshot,
       const LocalFileSyncInfo& sync_file_info,
       const FileChange& last_change,
       const FileChangeList& changes,
       SyncStatusCode status);
 
   Profile* profile_;
 
   scoped_refptr<LocalFileSyncContext> sync_context_;
 
   // Origin to context map. (Assuming that as far as we're in the same
@@ skipping 14 matching lines @@
   LocalChangeProcessor* local_change_processor_;
 
   ObserverList<Observer> change_observers_;
 
   DISALLOW_COPY_AND_ASSIGN(LocalFileSyncService);
 };
 
 }  // namespace sync_file_system
 
 #endif  // CHROME_BROWSER_SYNC_FILE_SYSTEM_LOCAL_LOCAL_FILE_SYNC_SERVICE_H_