ozone: Implement PlatformObject<T> for platform-specific objects

ui/ozone/platform_selection.h

+// Copyright 2014 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 UI_OZONE_PLATFORM_SELECTION_H_
+#define UI_OZONE_PLATFORM_SELECTION_H_
+
+#include "ui/ozone/ozone_export.h"
+#include "ui/ozone/platform_list.h"
+
+namespace ui {
+
+// Get active platform id (by parsing --ozone-platform flag).
+OZONE_EXPORT int GetOzonePlatformId();
+
+// Get active platform name.
+OZONE_EXPORT const char* GetOzonePlatformName();
+
+}  // namespace ui
+
+#endif  // UI_OZONE_PLATFORM_SELECTION_H_