Introduce FileSystemFileUtil and -Proxy to decorate base::file_util in webkit/fileapi.

webkit/fileapi/file_system_operation.h

Index: webkit/fileapi/file_system_operation.h
diff --git a/webkit/fileapi/file_system_operation.h b/webkit/fileapi/file_system_operation.h
index 6542806853b47ecdf422b4f815d4a383331a870f..c67174990ae60d7f365e2503f98f4fba881a825e 100644
--- a/webkit/fileapi/file_system_operation.h
+++ b/webkit/fileapi/file_system_operation.h
@@ -32,6 +32,7 @@ namespace fileapi {
 
 class FileSystemCallbackDispatcher;
 class FileSystemContext;
+class FileSystemOperationContext;
 class FileWriterDelegate;
 
 // This class is designed to serve one-time file system operation per instance.
@@ -55,7 +56,7 @@ class FileSystemOperation {
                   bool exclusive);
   void CreateDirectory(const FilePath& path,
                        bool exclusive,
-                       bool recursive);
+                       bool unused);
   void Copy(const FilePath& src_path,
             const FilePath& dest_path);
   void Move(const FilePath& src_path,
@@ -172,6 +173,7 @@ class FileSystemOperation {
   scoped_ptr<FileSystemCallbackDispatcher> dispatcher_;
 
   scoped_refptr<FileSystemContext> file_system_context_;
+  scoped_ptr<FileSystemOperationContext> file_system_operation_context_;
 
   base::ScopedCallbackFactory<FileSystemOperation> callback_factory_;