Make cc::CompositorFrames movable [Part 2 of 2]

components/mus/ws/platform_display.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 COMPONENTS_MUS_WS_PLATFORM_DISPLAY_H_
 #define COMPONENTS_MUS_WS_PLATFORM_DISPLAY_H_
 
 #include <stdint.h>
 
 #include <map>
@@ skipping 132 matching lines @@
   // This method initiates a top level redraw of the display.
   // TODO(fsamuel): This should use vblank as a signal rather than a timer
   // http://crbug.com/533042
   void Draw();
 
   // This is called after cc::Display has completed generating a new frame
   // for the display. TODO(fsamuel): Idle time processing should happen here
   // if there is budget for it.
   void DidDraw(cc::SurfaceDrawStatus status);
   void UpdateMetrics(const gfx::Size& size, float device_scale_factor);
-  std::unique_ptr<cc::CompositorFrame> GenerateCompositorFrame();
+  cc::CompositorFrame GenerateCompositorFrame();
 
   // ui::PlatformWindowDelegate:
   void OnBoundsChanged(const gfx::Rect& new_bounds) override;
   void OnDamageRect(const gfx::Rect& damaged_region) override;
   void DispatchEvent(ui::Event* event) override;
   void OnCloseRequest() override;
   void OnClosed() override;
   void OnWindowStateChanged(ui::PlatformWindowState new_state) override;
   void OnLostCapture() override;
   void OnAcceleratedWidgetAvailable(gfx::AcceleratedWidget widget,
@@ skipping 22 matching lines @@
   base::WeakPtrFactory<DefaultPlatformDisplay> weak_factory_;
 
   DISALLOW_COPY_AND_ASSIGN(DefaultPlatformDisplay);
 };
 
 }  // namespace ws
 
 }  // namespace mus
 
 #endif  // COMPONENTS_MUS_WS_PLATFORM_DISPLAY_H_