Switch DRM platform to using a separate thread

ui/ozone/platform/drm/gpu/gbm_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_GBM_SURFACE_H_
 #define UI_OZONE_PLATFORM_DRM_GPU_GBM_SURFACE_H_
 
 #include "base/macros.h"
 #include "base/memory/weak_ptr.h"
 #include "ui/gfx/geometry/size.h"
 #include "ui/ozone/platform/drm/gpu/gbm_surfaceless.h"
 #include "ui/ozone/public/surface_ozone_egl.h"
 
 struct gbm_bo;
 struct gbm_surface;
 
 namespace ui {
 
 class DrmBuffer;
-class DrmWindow;
 class GbmDevice;
 
 // Extends the GBM surfaceless functionality and adds an implicit surface for
 // the primary plane. Arbitrary buffers can still be allocated and displayed as
 // overlay planes, however the primary plane is associated with the native
 // surface and is updated via an EGLSurface.
 class GbmSurface : public GbmSurfaceless {
  public:
-  GbmSurface(DrmWindow* window, const scoped_refptr<GbmDevice>& gbm);
+  GbmSurface(scoped_ptr<DrmWindowProxy> window,
+             const scoped_refptr<GbmDevice>& gbm);
   ~GbmSurface() override;
 
   bool Initialize();
 
   // GbmSurfaceless:
   intptr_t GetNativeWindow() override;
   bool ResizeNativeWindow(const gfx::Size& viewport_size) override;
   bool OnSwapBuffers() override;
   bool OnSwapBuffersAsync(const SwapCompletionCallback& callback) override;
 
@@ skipping 13 matching lines @@
   gfx::Size size_;
 
   base::WeakPtrFactory<GbmSurface> weak_factory_;
 
   DISALLOW_COPY_AND_ASSIGN(GbmSurface);
 };
 
 }  // namespace ui
 
 #endif  // UI_OZONE_PLATFORM_DRM_GPU_GBM_SURFACE_H_