Add mechanism to auto mount file systems in response to a URL request.

chrome/browser/media_galleries/fileapi/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/file_util.h"
 #include "base/files/scoped_temp_dir.h"
@@ skipping 115 matching lines @@
     additional_providers.push_back(new MediaFileSystemBackend(
         data_dir_.path(), base::MessageLoopProxy::current().get()));
 
     file_system_context_ = new fileapi::FileSystemContext(
         base::MessageLoopProxy::current().get(),
         base::MessageLoopProxy::current().get(),
         fileapi::ExternalMountPoints::CreateRefCounted().get(),
         storage_policy.get(),
         NULL,
         additional_providers.Pass(),
+        std::vector<fileapi::URLRequestAutoMountHandler>(),
         data_dir_.path(),
         content::CreateAllowFileAccessOptions());
 
     filesystem_id_ = isolated_context()->RegisterFileSystemForPath(
         fileapi::kFileSystemTypeNativeMedia, root_path(), NULL);
 
     isolated_context()->AddReference(filesystem_id_);
   }
 
   virtual void TearDown() {
@@ skipping 417 matching lines @@
       expected_error = base::File::FILE_OK;
     else
       expected_error = base::File::FILE_ERROR_SECURITY;
     error = base::File::FILE_ERROR_FAILED;
     operation_runner()->CreateSnapshotFile(url,
         base::Bind(CreateSnapshotCallback, &error));
     base::MessageLoop::current()->RunUntilIdle();
     ASSERT_EQ(expected_error, error);
   }
 }