[Ozone-DRI] Convert HardwareDisplayController to use scanout buffers

ui/ozone/platform/dri/dri_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_DRI_DRI_SURFACE_H_
 #define UI_OZONE_PLATFORM_DRI_DRI_SURFACE_H_
 
 #include "base/compiler_specific.h"
 #include "base/memory/ref_counted.h"
 #include "ui/gfx/geometry/size.h"
 #include "ui/gfx/skia_util.h"
 #include "ui/ozone/platform/dri/scanout_surface.h"
 
 class SkCanvas;
 
 namespace ui {
 
 class DriBuffer;
 class DriWrapper;
 
 // An implementation of ScanoutSurface which uses dumb buffers (used for
 // software rendering).
 class DriSurface : public ScanoutSurface {
  public:
   DriSurface(DriWrapper* dri, const gfx::Size& size);
   virtual ~DriSurface();
 
   // Get a Skia canvas for a backbuffer.
   SkCanvas* GetDrawableForWidget();
+  scoped_refptr<DriBuffer> backbuffer() const {
+    return bitmaps_[front_buffer_ ^ 1];
+  }
 
   // ScanoutSurface:
   virtual bool Initialize() OVERRIDE;
   virtual uint32_t GetFramebufferId() const OVERRIDE;
   virtual uint32_t GetHandle() const OVERRIDE;
   virtual void PreSwapBuffers() OVERRIDE;
   virtual void SwapBuffers() OVERRIDE;
   virtual gfx::Size Size() const OVERRIDE;
 
  private:
-  DriBuffer* frontbuffer() const { return bitmaps_[front_buffer_].get(); }
-  DriBuffer* backbuffer() const { return bitmaps_[front_buffer_ ^ 1].get(); }
-
   // Stores the connection to the graphics card. Pointer not owned by this
   // class.
   DriWrapper* dri_;
 
   // The actual buffers used for painting.
   scoped_refptr<DriBuffer> bitmaps_[2];
 
   // Keeps track of which bitmap is |buffers_| is the frontbuffer.
   int front_buffer_;
 
   // Surface size.
   gfx::Size size_;
 
   DISALLOW_COPY_AND_ASSIGN(DriSurface);
 };
 
 }  // namespace ui
 
 #endif  // UI_OZONE_PLATFORM_DRI_DRI_SURFACE_H_