mash: Fix shelf window property use in Chrome.

chrome/browser/ui/ash/property_util.h

+// Copyright 2016 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 CHROME_BROWSER_UI_ASH_PROPERTY_UTIL_H_
+#define CHROME_BROWSER_UI_ASH_PROPERTY_UTIL_H_
+
+#include "base/strings/string16.h"
+#include "ui/aura/window.h"
+
+// These utility functions set ui::Window properties when running in mash, or
+// they set aura::Window properties when running in classic ash (without mus).
+
+namespace property_util {
+
+// Sets the |value| of the given window |property|; supports limited properties.
+void SetIntProperty(aura::Window* window,
+                    const aura::WindowProperty<int>* property,
+                    int value);
+
+// Set the aura::Window title value or the ui::Window title property value.
+void SetTitle(aura::Window* window, const base::string16& value);
+
+}  // namespace property_util
+
+#endif  // CHROME_BROWSER_UI_ASH_PROPERTY_UTIL_H_