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

ui/ozone/platform_constructor_list.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_CONSTRUCTOR_LIST_H_
+#define UI_OZONE_PLATFORM_CONSTRUCTOR_LIST_H_
+
+#include "base/memory/scoped_ptr.h"
+#include "ui/ozone/platform_list.h"
+
+namespace ui {
+
+template <class T>
+struct PlatformConstructorList {
+  typedef T* (*Constructor)();
+  static const Constructor kConstructors[kPlatformCount];
+};
+
+}  // namespace ui
+
+#endif  // UI_OZONE_PLATFORM_CONSTRUCTOR_LIST_H_