mandoline filesystem: Save cookie data to the mojo:filesystem.

mojo/runner/scoped_user_data_dir.h

Index: mojo/runner/scoped_user_data_dir.h
diff --git a/mojo/runner/scoped_user_data_dir.h b/mojo/runner/scoped_user_data_dir.h
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+// Copyright 2015 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 MOJO_RUNNER_SCOPED_USER_DATA_DIR_H_
+#define MOJO_RUNNER_SCOPED_USER_DATA_DIR_H_
+
+#include "base/files/scoped_temp_dir.h"
+
+namespace mojo {
+namespace runner {
+
+// A scoped class which owns a ScopedTempDir if --use-temporary-user-data-dir
+// is set. If it is, also modifies the command line so that --user-data-dir
+// points to the temporary dir.
+class ScopedUserDataDir {
+ public:
+  ScopedUserDataDir();
+  ~ScopedUserDataDir();
+
+ private:
+  base::ScopedTempDir temp_dir_;
+};
+
+}  // namespace runner
+}  // namespace mojo
+
+#endif  // MOJO_RUNNER_SCOPED_USER_DATA_DIR_H_