Switch DRM platform to using a separate thread

ui/ozone/platform/drm/gpu/gbm_buffer.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_BUFFER_H_
 #define UI_OZONE_PLATFORM_DRM_GPU_GBM_BUFFER_H_
 
 #include "base/macros.h"
 #include "base/memory/scoped_ptr.h"
 #include "ui/gfx/buffer_types.h"
 #include "ui/gfx/geometry/size.h"
 #include "ui/ozone/platform/drm/gpu/gbm_buffer_base.h"
-#include "ui/ozone/platform/drm/gpu/screen_manager.h"
 #include "ui/ozone/public/native_pixmap.h"
 
 struct gbm_bo;
 
 namespace ui {
 
+class DrmThread;
+class DrmWindowProxy;
 class GbmDevice;
 
 class GbmBuffer : public GbmBufferBase {
  public:
   static scoped_refptr<GbmBuffer> CreateBuffer(
       const scoped_refptr<GbmDevice>& gbm,
       gfx::BufferFormat format,
       const gfx::Size& size,
       gfx::BufferUsage usage);
   gfx::BufferUsage GetUsage() const { return usage_; }
 
  private:
   GbmBuffer(const scoped_refptr<GbmDevice>& gbm,
             gbm_bo* bo,
             gfx::BufferUsage usage);
   ~GbmBuffer() override;
 
   gfx::BufferUsage usage_;
 
   DISALLOW_COPY_AND_ASSIGN(GbmBuffer);
 };
 
 class GbmPixmap : public NativePixmap {
  public:
-  GbmPixmap(const scoped_refptr<GbmBuffer>& buffer,
-            ScreenManager* screen_manager);
+  GbmPixmap(const scoped_refptr<GbmBuffer>& buffer, DrmThread* drm_thread);
   bool Initialize();
   void SetScalingCallback(const ScalingCallback& scaling_callback) override;
   scoped_refptr<NativePixmap> GetScaledPixmap(gfx::Size new_size) override;
 
   // NativePixmap:
   void* GetEGLClientBuffer() override;
   int GetDmaBufFd() override;
   int GetDmaBufPitch() override;
   bool ScheduleOverlayPlane(gfx::AcceleratedWidget widget,
                             int plane_z_order,
                             gfx::OverlayTransform plane_transform,
                             const gfx::Rect& display_bounds,
                             const gfx::RectF& crop_rect) override;
   gfx::NativePixmapHandle ExportHandle() override;
 
   scoped_refptr<GbmBuffer> buffer() { return buffer_; }
 
  private:
   ~GbmPixmap() override;
   bool ShouldApplyScaling(const gfx::Rect& display_bounds,
                           const gfx::RectF& crop_rect,
                           gfx::Size* required_size);
 
   scoped_refptr<GbmBuffer> buffer_;
   int dma_buf_ = -1;
 
-  ScreenManager* screen_manager_;  // Not owned.
+  DrmThread* drm_thread_;  // Not owned.
+
+  // Since buffers are likely to be shown on the same window, keep a cached
+  // window proxy so we don't have to get this every time the buffer is used.
+  scoped_ptr<DrmWindowProxy> cached_window_;
 
   ScalingCallback scaling_callback_;
 
   DISALLOW_COPY_AND_ASSIGN(GbmPixmap);
 };
 
 }  // namespace ui
 
 #endif  // UI_OZONE_PLATFORM_DRM_GPU_GBM_BUFFER_H_