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

chrome/browser/file_system/file_system_backend.h

Index: chrome/browser/file_system/file_system_backend.h
===================================================================
--- chrome/browser/file_system/file_system_backend.h	(revision 0)
+++ chrome/browser/file_system/file_system_backend.h	(revision 0)
@@ -0,0 +1,83 @@
+// 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_H_
+#define CHROME_BROWSER_FILE_SYSTEM_FILE_SYSTEM_BACKEND_H_
+
+#include <vector>
+
+#include "base/file_path.h"
+#include "base/file_util_proxy.h"
+#include "base/scoped_callback_factory.h"
+#include "chrome/browser/chrome_thread.h"
+
+class FileSystemBackendClient;
+
+class FileSystemBackend {
+ public:
+  FileSystemBackend();
+
+  void set_client(FileSystemBackendClient* client);
+
+  void CreateFile(const FilePath& path,
+                  bool exclusive,
+                  int request_id);
+
+  void CreateDirectory(const FilePath& path,
+                       bool exclusive,
+                       int request_id);
+
+  void Copy(const FilePath& src_path,
+            const FilePath& dest_path,
+            int request_id);
+
+  void Move(const FilePath& src_path,
+            const FilePath& dest_path,
+            int request_id);
+
+  void DirectoryExists(const FilePath& path, int request_id);
+
+  void FileExists(const FilePath& path, int request_id);
+
+  void GetMetadata(const FilePath& path, int request_id);
+
+  void ReadDirectory(const FilePath& path, int request_id);
+
+  void Remove(const FilePath& path, int request_id);
+
+ private:
+  // Callbacks for above methods.
+  void DidCreateFileExclusive(
+      base::PlatformFileError rv, base::PassPlatformFile file, bool created);
+
+  // Returns success even if the file already existed.
+  void DidCreateFileNonExclusive(
+      base::PlatformFileError rv, base::PassPlatformFile file, bool created);
+
+  // Generic callback that translates platform errors to WebKit error codes.
+  void DidFinishFileOperation(base::PlatformFileError rv);
+
+  void DidDirectoryExists(base::PlatformFileError rv,
+                          const file_util::FileInfo& file_info);
+
+  void DidFileExists(base::PlatformFileError rv,
+                     const file_util::FileInfo& file_info);
+
+  void DidGetMetadata(base::PlatformFileError rv,
+                      const file_util::FileInfo& file_info);
+
+  void DidReadDirectory(
+      base::PlatformFileError rv,
+      const std::vector<base::file_util_proxy::Entry>& entries);
+
+  // Not owned.
+  FileSystemBackendClient* client_;
+  // Client's request id.
+  int request_id_;
+  base::ScopedCallbackFactory<FileSystemBackend> callback_factory_;
+
+  DISALLOW_COPY_AND_ASSIGN(FileSystemBackend);
+};
+
+#endif  // CHROME_BROWSER_FILE_SYSTEM_FILE_SYSTEM_BACKEND_H_