gdata: Convert public synchronous functions in GDataFileSystem to asynchronous.

chrome/browser/chromeos/gdata/gdata_file_system_proxy.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_CHROMEOS_GDATA_GDATA_FILE_SYSTEM_PROXY_H_
 #define CHROME_BROWSER_CHROMEOS_GDATA_GDATA_FILE_SYSTEM_PROXY_H_
 #pragma once
 
 #include "webkit/chromeos/fileapi/remote_file_system_proxy.h"
 
@@ skipping 51 matching lines @@
   // Helper callback for relaying reply for metadata retrieval request to the
   // calling thread.
   void OnGetMetadata(
       const FilePath& file_path,
       const fileapi::FileSystemOperationInterface::GetMetadataCallback&
           callback,
       base::PlatformFileError error,
       const FilePath& entry_path,
       scoped_ptr<gdata::GDataEntryProto> entry_proto);
 
+  // Helper callback for relaying reply for GetEntryInfoByPathAsync() to the
+  // calling thread.
+  void OnGetEntryInfoByPathAsync(
+      const fileapi::FileSystemOperationInterface::SnapshotFileCallback&
+          callback,
+      base::PlatformFileError error,
+      const FilePath& entry_path,
+      scoped_ptr<GDataEntryProto> entry_proto);
+
   // Helper callback for relaying reply for ReadDirectory() to the calling
   // thread.
   void OnReadDirectory(
       bool hide_hosted_documents,
       const fileapi::FileSystemOperationInterface::ReadDirectoryCallback&
           callback,
       base::PlatformFileError error,
       scoped_ptr<GDataDirectoryProto> directory_proto);
 
   // GDataFileSystemProxy is owned by Profile, which outlives
   // GDataFileSystemProxy, which is owned by CrosMountPointProvider (i.e. by
   // the time Profile is removed, the file manager is already gone). Hence
   // it's safe to use this as a raw pointer.
   GDataFileSystemInterface* file_system_;
 };
 
 }  // namespace chromeos
 
 #endif  // CHROME_BROWSER_CHROMEOS_GDATA_GDATA_FILE_SYSTEM_PROXY_H_