Make MediaFileUtil run on thread pool.

webkit/fileapi/file_system_task_runners.cc

Index: webkit/fileapi/file_system_task_runners.cc
diff --git a/webkit/fileapi/file_system_task_runners.cc b/webkit/fileapi/file_system_task_runners.cc
new file mode 100644
index 0000000000000000000000000000000000000000..fbd2606c4d99fb9e451598e6dde62fe1d5c5605f
--- /dev/null
+++ b/webkit/fileapi/file_system_task_runners.cc
@@ -0,0 +1,34 @@
+// 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.
+
+#include "webkit/fileapi/file_system_task_runners.h"
+
+#include "base/message_loop_proxy.h"
+#include "base/sequenced_task_runner.h"
+#include "base/single_thread_task_runner.h"
+
+namespace fileapi {
+
+FileSystemTaskRunners::FileSystemTaskRunners(
+    base::SingleThreadTaskRunner* io_task_runner,
+    base::SingleThreadTaskRunner* file_task_runner,
+    base::SequencedTaskRunner* media_task_runner)
+    : io_task_runner_(io_task_runner),
+      file_task_runner_(file_task_runner),
+      media_task_runner_(media_task_runner) {
+}
+
+// static
+scoped_ptr<FileSystemTaskRunners>
+FileSystemTaskRunners::CreateMockTaskRunners() {
+  return make_scoped_ptr(new FileSystemTaskRunners(
+      base::MessageLoopProxy::current(),
+      base::MessageLoopProxy::current(),
+      base::MessageLoopProxy::current()));
+}
+
+FileSystemTaskRunners::~FileSystemTaskRunners() {
+}
+
+}  // namespace fileapi