FileAPI: Add Initialize() function to FileSystemBackend

webkit/browser/fileapi/file_system_backend.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 WEBKIT_BROWSER_FILEAPI_FILE_SYSTEM_BACKEND_H_
 #define WEBKIT_BROWSER_FILEAPI_FILE_SYSTEM_BACKEND_H_
 
 #include <string>
 #include <vector>
 
@@ skipping 35 matching lines @@
   typedef base::Callback<void(const GURL& root_url,
                               const std::string& name,
                               base::PlatformFileError error)>
       InitializeFileSystemCallback;
   virtual ~FileSystemBackend() {}
 
   // Returns true if this mount point provider can handle |type|.
   // One mount point provider may be able to handle multiple filesystem types.
   virtual bool CanHandleType(FileSystemType type) const = 0;
 
+  // Initializes the filesystem.

[kinuko, 2013/07/23 07:33:49]

Can you elaborate more?  E.g.

This method if called right after the backend is registered in the
FileSystemContext and before any other methods are called.   Each backend can
implement additional initialization which depends on FileSystemContext.

[nhiroki, 2013/07/23 08:11:23]

Done.

+  virtual void Initialize(const FileSystemContext* context) = 0;
+
   // Initializes the filesystem for the given |origin_url| and |type|.
   // This verifies if it is allowed to request (or create) the filesystem
   // and if it can access (or create) the root directory of the mount point.
   // If |mode| is CREATE_IF_NONEXISTENT calling this may also create
   // the root directory (and/or related database entries etc) for
   // the filesystem if it doesn't exist.
   virtual void InitializeFileSystem(
       const GURL& origin_url,
       FileSystemType type,
       OpenFileSystemMode mode,
@@ skipping 77 matching lines @@
         const std::string& extension_id) = 0;
   // Gets virtual path by known filesystem path. Returns false when filesystem
   // path is not exposed by this provider.
   virtual bool GetVirtualPath(const base::FilePath& file_system_path,
                               base::FilePath* virtual_path) = 0;
 };
 
 }  // namespace fileapi
 
 #endif  // WEBKIT_BROWSER_FILEAPI_FILE_SYSTEM_BACKEND_H_