Switch DRM platform to using a separate thread

ui/ozone/platform/drm/gpu/drm_surface.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_DRM_GPU_DRM_SURFACE_H_
 #define UI_OZONE_PLATFORM_DRM_GPU_DRM_SURFACE_H_
 
 #include "base/memory/ref_counted.h"
 #include "base/memory/weak_ptr.h"
 #include "ui/gfx/geometry/rect.h"
 #include "ui/gfx/geometry/size.h"
 #include "ui/gfx/skia_util.h"
 #include "ui/gfx/swap_result.h"
 #include "ui/ozone/ozone_export.h"
 #include "ui/ozone/public/surface_ozone_canvas.h"
 
 class SkImage;
 class SkSurface;
 
 namespace ui {
 
 class DrmBuffer;
-class DrmWindow;
-class HardwareDisplayController;
+class DrmWindowProxy;
 
 class OZONE_EXPORT DrmSurface : public SurfaceOzoneCanvas {
  public:
-  DrmSurface(DrmWindow* window);
+  DrmSurface(scoped_ptr<DrmWindowProxy> window);
   ~DrmSurface() override;
 
   // SurfaceOzoneCanvas:
   skia::RefPtr<SkSurface> GetSurface() override;
   void ResizeCanvas(const gfx::Size& viewport_size) override;
   void PresentCanvas(const gfx::Rect& damage) override;
   scoped_ptr<gfx::VSyncProvider> CreateVSyncProvider() override;
 
  private:
   void SchedulePageFlip();
 
   // Callback for SchedulePageFlip(). This will signal when the page flip event
   // has completed.
   void OnPageFlip(gfx::SwapResult result);
 
-  DrmWindow* window_;
+  scoped_ptr<DrmWindowProxy> window_;
 
   // The actual buffers used for painting.
   scoped_refptr<DrmBuffer> front_buffer_;
   scoped_refptr<DrmBuffer> back_buffer_;
 
   skia::RefPtr<SkSurface> surface_;
   gfx::Rect last_damage_;
 
   // Keep track of the requested image and damage for the last presentation.
   // This will be used to update the scanout buffers once the previous page flip
   // events completes.
   skia::RefPtr<SkImage> pending_image_;
   gfx::Rect pending_image_damage_;
   bool pending_pageflip_ = false;
 
   base::WeakPtrFactory<DrmSurface> weak_ptr_factory_;
 
   DISALLOW_COPY_AND_ASSIGN(DrmSurface);
 };
 
 }  // namespace ui
 
 #endif  // UI_OZONE_PLATFORM_DRM_GPU_DRM_SURFACE_H_