Add an option to specify requested fields for fetching metadata.

storage/browser/fileapi/async_file_util.h

 // Copyright (c) 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 STORAGE_BROWSER_FILEAPI_ASYNC_FILE_UTIL_H_
 #define STORAGE_BROWSER_FILEAPI_ASYNC_FILE_UTIL_H_
 
 #include <vector>
 
 #include "base/basictypes.h"
@@ skipping 62 matching lines @@
   typedef base::Callback<
       void(base::File::Error result,
            const base::File::Info& file_info,
            const base::FilePath& platform_path,
            const scoped_refptr<storage::ShareableFileReference>& file_ref)>
       CreateSnapshotFileCallback;
 
   typedef base::Callback<void(int64 size)> CopyFileProgressCallback;
 
   typedef FileSystemOperation::CopyOrMoveOption CopyOrMoveOption;
+  typedef FileSystemOperation::GetMetadataField GetMetadataField;
 
   // Creates an AsyncFileUtil instance which performs file operations on
   // local native file system. The created instance assumes
   // FileSystemURL::path() has the target platform path.
   STORAGE_EXPORT static AsyncFileUtil*
       CreateForLocalFileSystem();
 
   AsyncFileUtil() {}
   virtual ~AsyncFileUtil() {}
 
@@ skipping 49 matching lines @@
       const StatusCallback& callback) = 0;
 
   // Retrieves the information about a file.
   //
   // FileSystemOperationImpl::GetMetadata calls this.
   //
   // This reports following error code via |callback|:
   // - File::FILE_ERROR_NOT_FOUND if the file doesn't exist.
   // - Other error code if there was an error while retrieving the file info.
   //
-  virtual void GetFileInfo(
-      scoped_ptr<FileSystemOperationContext> context,
-      const FileSystemURL& url,
-      const GetFileInfoCallback& callback) = 0;
+  virtual void GetFileInfo(scoped_ptr<FileSystemOperationContext> context,
+                           const FileSystemURL& url,
+                           int fields,
+                           const GetFileInfoCallback& callback) = 0;
 
   // Reads contents of a directory at |path|.
   //
   // FileSystemOperationImpl::ReadDirectory calls this.
   //
   // Note that the |name| field of each entry in |file_list|
   // returned by |callback| should have a base file name
   // of the entry relative to the directory, but not an absolute path.
   //
   // (E.g. if ReadDirectory is called for a directory
@@ skipping 191 matching lines @@
       const FileSystemURL& url,
       const CreateSnapshotFileCallback& callback) = 0;
 
  private:
   DISALLOW_COPY_AND_ASSIGN(AsyncFileUtil);
 };
 
 }  // namespace storage
 
 #endif  // STORAGE_BROWSER_FILEAPI_ASYNC_FILE_UTIL_H_