Make MediaFileUtil run on thread pool.

webkit/fileapi/obfuscated_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 <algorithm>
 #include <set>
 #include <string>
 
 #include "base/bind.h"
 #include "base/file_path.h"
@@ skipping 105 matching lines @@
         base::MessageLoopProxy::current(),
         base::MessageLoopProxy::current(),
         storage_policy);
 
     // Every time we create a new helper, it creates another context, which
     // creates another path manager, another sandbox_mount_point_provider, and
     // another OFU.  We need to pass in the context to skip all that.
     file_system_context_ = new FileSystemContext(
         base::MessageLoopProxy::current(),
         base::MessageLoopProxy::current(),
+        base::MessageLoopProxy::current(),
         storage_policy,
         quota_manager_->proxy(),
         data_dir_.path(),
         CreateAllowFileAccessOptions());
 
     obfuscated_file_util_ = static_cast<ObfuscatedFileUtil*>(
         file_system_context_->GetFileUtil(type_));
 
     test_helper_.SetUp(file_system_context_.get(),
                        obfuscated_file_util_);
@@ skipping 2074 matching lines @@
 
   // Opening it with TRUNCATED flag, which should truncate the file size.
   ASSERT_EQ(base::PLATFORM_FILE_OK,
             ofu()->CreateOrOpen(
                 AllowUsageIncrease(-length)->context(), file,
                 base::PLATFORM_FILE_OPEN_TRUNCATED | base::PLATFORM_FILE_WRITE,
                 &file_handle, &created));
   ASSERT_EQ(0, ComputeTotalFileSize());
   EXPECT_TRUE(base::ClosePlatformFile(file_handle));
 }