Make MediaFileUtil run on thread pool.

webkit/fileapi/media/native_media_file_util_unittest.cc

 // 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 <set>
 #include <string>
 
 #include "base/bind.h"
 #include "base/message_loop.h"
 #include "base/scoped_temp_dir.h"
@@ skipping 78 matching lines @@
   void SetUp() {
     ASSERT_TRUE(data_dir_.CreateUniqueTempDir());
 
     scoped_refptr<quota::SpecialStoragePolicy> storage_policy =
         new quota::MockSpecialStoragePolicy();
 
     file_system_context_ =
         new FileSystemContext(
             base::MessageLoopProxy::current(),
             base::MessageLoopProxy::current(),
+            base::MessageLoopProxy::current(),
             storage_policy,
             NULL,
             data_dir_.path(),
             CreateAllowFileAccessOptions());
 
     file_util_ = file_system_context_->GetFileUtil(kFileSystemTypeNativeMedia);
 
     filesystem_id_ = isolated_context()->RegisterFileSystemForPath(
         kFileSystemTypeNativeMedia, root_path(), NULL);
 
@@ skipping 83 matching lines @@
   EXPECT_TRUE(completed);
   EXPECT_EQ(5u, content.size());
 
   for (size_t i = 0; i < arraysize(kFilteringTestCases); ++i) {
     FilePath::StringType name =
         FilePath(kFilteringTestCases[i].path).BaseName().value();
     std::set<FilePath::StringType>::const_iterator found = content.find(name);
     EXPECT_EQ(kFilteringTestCases[i].visible, found != content.end());
   }
 }