Switch DRM platform to using a separate thread

ui/ozone/platform/drm/gpu/drm_window_proxy.h

Index: ui/ozone/platform/drm/gpu/drm_window_proxy.h
diff --git a/ui/ozone/platform/drm/gpu/drm_window_proxy.h b/ui/ozone/platform/drm/gpu/drm_window_proxy.h
new file mode 100644
index 0000000000000000000000000000000000000000..778ba53dddb7238aaa9c9e88e5a995b772e68419
--- /dev/null
+++ b/ui/ozone/platform/drm/gpu/drm_window_proxy.h
@@ -0,0 +1,61 @@
+// Copyright 2015 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_WINDOW_PROXY_H_
+#define UI_OZONE_PLATFORM_DRM_GPU_DRM_WINDOW_PROXY_H_
+
+#include "base/memory/ref_counted.h"
+#include "base/memory/weak_ptr.h"
+#include "ui/gfx/native_widget_types.h"
+#include "ui/gfx/vsync_provider.h"
+#include "ui/ozone/public/surface_ozone_egl.h"
+
+namespace base {
+class SingleThreadTaskRunner;
+}
+
+namespace gfx {
+class Rect;
+}
+
+namespace ui {
+
+class DrmDevice;
+class DrmWindow;
+struct OverlayPlane;
+
+class DrmWindowProxy {
+ public:
+  DrmWindowProxy(const scoped_refptr<base::SingleThreadTaskRunner>& task_runner,
+                 base::WeakPtr<DrmWindow> impl,
+                 gfx::AcceleratedWidget widget);
+  ~DrmWindowProxy();
+
+  gfx::AcceleratedWidget widget() const { return widget_; }
+
+  void QueueOverlayPlane(const OverlayPlane& plane) const;
+
+  bool SchedulePageFlip(bool is_sync,
+                        const SwapCompletionCallback& callback) const;
+
+  bool IsDisplayedOnUniversalDisplayLinkDevice() const;
+
+  gfx::Rect GetBounds() const;
+
+  void GetVSyncParameters(
+      const gfx::VSyncProvider::UpdateVSyncCallback& callback) const;
+
+  scoped_refptr<DrmDevice> GetDrmDevice() const;
+
+ private:
+  scoped_refptr<base::SingleThreadTaskRunner> task_runner_;
+  base::WeakPtr<DrmWindow> impl_;
+  gfx::AcceleratedWidget widget_;
+
+  DISALLOW_COPY_AND_ASSIGN(DrmWindowProxy);
+};
+
+}  // namespace ui
+
+#endif  // UI_OZONE_PLATFORM_DRM_GPU_DRM_WINDOW_PROXY_H_