Switch DRM platform to using a separate thread

ui/ozone/platform/drm/gpu/drm_window.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_WINDOW_H_
 #define UI_OZONE_PLATFORM_DRM_GPU_DRM_WINDOW_H_
 
 #include <vector>
 
 #include "base/timer/timer.h"
@@ skipping 10 matching lines @@
 class SkBitmap;
 
 namespace gfx {
 class Point;
 class Rect;
 }  // namespace gfx
 
 namespace ui {
 
 class DrmBuffer;
+class DrmDevice;
 class DrmDeviceManager;
 class HardwareDisplayController;
 struct OverlayCheck_Params;
 class ScanoutBufferGenerator;
 class ScreenManager;
 
 // The GPU object representing a window.
 //
 // The main purpose of this object is to associate drawing surfaces with
 // displays. A surface created with the same id as the window (from
 // GetAcceleratedWidget()) will paint onto that window. A window with
 // the same bounds as a display will paint onto that display.
 //
 // If there's no display whose bounds match the window's, the window is
 // disconnected and its contents will not be visible to the user.
-class OZONE_EXPORT DrmWindow {
+class OZONE_EXPORT DrmWindow : public base::SupportsWeakPtr<DrmWindow> {
  public:
   DrmWindow(gfx::AcceleratedWidget widget,
             DrmDeviceManager* device_manager,
             ScreenManager* screen_manager);
 
   ~DrmWindow();
 
   gfx::Rect bounds() const { return bounds_; }
 
   void Initialize();
@@ skipping 25 matching lines @@
 
   // Move the HW cursor to the specified location.
   void MoveCursor(const gfx::Point& location);
 
   // Queue overlay planes and page flips.
   // If hardware display controller is available, forward the information
   // immediately, otherwise queue up on the window and forward when the hardware
   // is once again ready.
   void QueueOverlayPlane(const OverlayPlane& plane);
 
-  bool SchedulePageFlip(const SwapCompletionCallback& callback);
+  void SchedulePageFlip(const SwapCompletionCallback& callback);
   bool TestPageFlip(const std::vector<OverlayCheck_Params>& planes,
                     ScanoutBufferGenerator* buffer_generator);
 
   // Returns the last buffer associated with this window.
   const OverlayPlane* GetLastModesetBuffer();
 
   void GetVSyncParameters(
       const gfx::VSyncProvider::UpdateVSyncCallback& callback) const;
 
  private:
@@ skipping 35 matching lines @@
   OverlayPlaneList last_submitted_planes_;
 
   bool force_buffer_reallocation_ = false;
 
   DISALLOW_COPY_AND_ASSIGN(DrmWindow);
 };
 
 }  // namespace ui
 
 #endif  // UI_OZONE_PLATFORM_DRM_GPU_DRM_WINDOW_H_