Change webkit/{fileapi,quota} code to use TaskRunner.

webkit/fileapi/file_system_operation_context.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_FILEAPI_FILE_SYSTEM_OPERATION_CONTEXT_H_
 #define WEBKIT_FILEAPI_FILE_SYSTEM_OPERATION_CONTEXT_H_
 
 #include "base/logging.h"
 #include "base/memory/ref_counted.h"
 #include "googleurl/src/gurl.h"
 #include "webkit/fileapi/file_system_file_util.h"
 #include "webkit/fileapi/file_system_types.h"
 
+namespace base {
+class SequencedTaskRunner;
+}
+
 namespace fileapi {
 
 class FileSystemContext;
 
 class FileSystemOperationContext {
  public:
   explicit FileSystemOperationContext(FileSystemContext* context);
   ~FileSystemOperationContext();
 
   FileSystemContext* file_system_context() const {
     return file_system_context_.get();
   }
 
   void set_allowed_bytes_growth(const int64& allowed_bytes_growth) {
     allowed_bytes_growth_ = allowed_bytes_growth;
   }
   int64 allowed_bytes_growth() const { return allowed_bytes_growth_; }
 
+  base::SequencedTaskRunner* file_task_runner() const;
+
  private:
   scoped_refptr<FileSystemContext> file_system_context_;
 
   int64 allowed_bytes_growth_;
 };
 
 }  // namespace fileapi
 
 #endif  // WEBKIT_FILEAPI_FILE_SYSTEM_OPERATION_CONTEXT_H_