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diff --git a/chromium/ui/ozone/demo/demo_window.h b/chromium/ui/ozone/demo/demo_window.h
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+++ b/chromium/ui/ozone/demo/demo_window.h
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+// Copyright 2018 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_DEMO_DEMO_WINDOW_H_
+#define UI_OZONE_DEMO_DEMO_WINDOW_H_
+
+#include "base/memory/weak_ptr.h"
+#include "ui/gfx/geometry/rect.h"
+#include "ui/gfx/geometry/size.h"
+#include "ui/platform_window/platform_window_delegate.h"
+
+namespace ui {
+
+class Event;
+class PlatformWindow;
+class Renderer;
+class RendererFactory;
+class WindowManager;
+
+class DemoWindow : public PlatformWindowDelegate {
+ public:
+  DemoWindow(WindowManager* window_manager,
+             RendererFactory* renderer_factory,
+             const gfx::Rect& bounds);
+  ~DemoWindow() override;
+
+  gfx::AcceleratedWidget GetAcceleratedWidget();
+
+  gfx::Size GetSize();
+
+  void Start();
+  void Quit();
+
+  // PlatformWindowDelegate:
+  void OnBoundsChanged(const gfx::Rect& new_bounds) override;
+  void OnDamageRect(const gfx::Rect& damaged_region) override;
+  void DispatchEvent(Event* event) override;
+  void OnCloseRequest() override;
+  void OnClosed() override;
+  void OnWindowStateChanged(PlatformWindowState new_state) override;
+  void OnLostCapture() override;
+  void OnAcceleratedWidgetAvailable(gfx::AcceleratedWidget widget,
+                                    float device_pixel_ratio) override;
+  void OnAcceleratedWidgetDestroyed() override;
+  void OnActivationChanged(bool active) override;
+
+ private:
+  // Since we pretend to have a GPU process, we should also pretend to
+  // initialize the GPU resources via a posted task.
+  void StartOnGpu();
+
+  WindowManager* window_manager_;      // Not owned.
+  RendererFactory* renderer_factory_;  // Not owned.
+
+  std::unique_ptr<Renderer> renderer_;
+
+  // Window-related state.
+  std::unique_ptr<PlatformWindow> platform_window_;
+  gfx::AcceleratedWidget widget_ = gfx::kNullAcceleratedWidget;
+
+  base::WeakPtrFactory<DemoWindow> weak_ptr_factory_;
+
+  DISALLOW_COPY_AND_ASSIGN(DemoWindow);
+};
+
+}  // namespace ui
+
+#endif  // UI_OZONE_DEMO_DEMO_WINDOW_H_