Changes for browser-side implementation for file api....

chrome/browser/file_system/file_system_backend_client.h

Index: chrome/browser/file_system/file_system_backend_client.h
===================================================================
--- chrome/browser/file_system/file_system_backend_client.h	(revision 0)
+++ chrome/browser/file_system/file_system_backend_client.h	(revision 0)
@@ -0,0 +1,32 @@
+// Copyright (c) 2010 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_FILE_SYSTEM_FILE_SYSTEM_BACKEND_CLIENT_H_
+#define CHROME_BROWSER_FILE_SYSTEM_FILE_SYSTEM_BACKEND_CLIENT_H_
+
+#include <vector>
+
+#include "base/file_util_proxy.h"
+#include "third_party/WebKit/WebKit/chromium/public/WebFileError.h"
+
+// Interface for client of FileSystemBackend.
+class FileSystemBackendClient {
+ public:
+  virtual ~FileSystemBackendClient() {}
+
+  virtual void DidFail(WebKit::WebFileError status, int request_id) = 0;
+
+  virtual void DidSucceed(int request_id) = 0;
+
+  // Info about the file entry such as modification date and size.
+  virtual void DidReadMetadata(const file_util::FileInfo& info,
+                               int request_id) = 0;
+
+  virtual void DidReadDirectory(
+      const std::vector<base::file_util_proxy::Entry>& entries,
+      bool has_more,
+      int request_id) = 0;
+};
+
+#endif  // CHROME_BROWSER_FILE_SYSTEM_FILE_SYSTEM_BACKEND_CLIENT_H_