Use SNAPSHOT sync mode for LocalSync

chrome/browser/sync_file_system/syncable_file_system_util.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_SYNCABLE_FILE_SYSTEM_UTIL_H_
 #define CHROME_BROWSER_SYNC_FILE_SYSTEM_SYNCABLE_FILE_SYSTEM_UTIL_H_
 
 #include <string>
 
 #include "base/files/file_path.h"
@@ skipping 67 matching lines @@
 void SetEnableSyncFSDirectoryOperation(bool flag);
 
 // Returns true if we allow directory operations in Sync FileSystem API.
 // It is disabled by default but can be overridden by a command-line switch
 // (--enable-syncfs-directory-operations) or by calling
 // SetEnableSyncFSDirectoryOperation().
 // TODO(nhiroki): This method should be used only for testing and should go
 // away when we fully support directory operations. (http://crbug.com/161442)
 bool IsSyncFSDirectoryOperationEnabled();
 
+// Returns SyncFileSystem sub-directory path.
+base::FilePath GetSyncFileSystemDir(const base::FilePath& profile_base_dir);
+
 // Enables directory operation for syncable filesystems temporarily for testing.
 class ScopedEnableSyncFSDirectoryOperation {
  public:
   ScopedEnableSyncFSDirectoryOperation();
   ~ScopedEnableSyncFSDirectoryOperation();
 
  private:
   bool was_enabled_;
 
   DISALLOW_COPY_AND_ASSIGN(ScopedEnableSyncFSDirectoryOperation);
 };
 
 }  // namespace sync_file_system
 
 #endif  // CHROME_BROWSER_SYNC_FILE_SYSTEM_SYNCABLE_FILE_SYSTEM_UTIL_H_