Add an option to specify requested fields for fetching metadata.

storage/browser/fileapi/file_system_operation_runner.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 STORAGE_BROWSER_FILEAPI_FILE_SYSTEM_OPERATION_RUNNER_H_
 #define STORAGE_BROWSER_FILEAPI_FILE_SYSTEM_OPERATION_RUNNER_H_
 
 #include <map>
 #include <set>
 #include <vector>
@@ skipping 30 matching lines @@
   typedef FileSystemOperation::ReadDirectoryCallback ReadDirectoryCallback;
   typedef FileSystemOperation::SnapshotFileCallback SnapshotFileCallback;
   typedef FileSystemOperation::StatusCallback StatusCallback;
   typedef FileSystemOperation::WriteCallback WriteCallback;
   typedef FileSystemOperation::OpenFileCallback OpenFileCallback;
   typedef FileSystemOperation::ErrorBehavior ErrorBehavior;
   typedef FileSystemOperation::CopyProgressCallback CopyProgressCallback;
   typedef FileSystemOperation::CopyFileProgressCallback
       CopyFileProgressCallback;
   typedef FileSystemOperation::CopyOrMoveOption CopyOrMoveOption;
+  typedef FileSystemOperation::GetMetadataField GetMetadataField;
 
   typedef int OperationID;
 
   virtual ~FileSystemOperationRunner();
 
   // Cancels all inflight operations.
   void Shutdown();
 
   // Creates a file at |url|. If |exclusive| is true, an error is raised
   // in case a file is already present at the URL.
@@ skipping 30 matching lines @@
   // Checks if a directory is present at |url|.
   OperationID DirectoryExists(const FileSystemURL& url,
                               const StatusCallback& callback);
 
   // Checks if a file is present at |url|.
   OperationID FileExists(const FileSystemURL& url,
                          const StatusCallback& callback);
 
   // Gets the metadata of a file or directory at |url|.
   OperationID GetMetadata(const FileSystemURL& url,
+                          int fields,
                           const GetMetadataCallback& callback);
 
   // Reads contents of a directory at |url|.
   OperationID ReadDirectory(const FileSystemURL& url,
                             const ReadDirectoryCallback& callback);
 
   // Removes a file or directory at |url|. If |recursive| is true, remove
   // all files and directories under the directory at |url| recursively.
   OperationID Remove(const FileSystemURL& url, bool recursive,
                      const StatusCallback& callback);
@@ skipping 204 matching lines @@
 
   // Callbacks for stray cancels whose target operation is already finished.
   std::map<OperationID, StatusCallback> stray_cancel_callbacks_;
 
   DISALLOW_COPY_AND_ASSIGN(FileSystemOperationRunner);
 };
 
 }  // namespace storage
 
 #endif  // STORAGE_BROWSER_FILEAPI_FILE_SYSTEM_OPERATION_RUNNER_H_