[Ozone-GBM] Migrate GBM buffers to use the ScanoutBuffer interface

ui/ozone/platform/dri/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_DRI_GBM_SURFACE_H_
 #define UI_OZONE_PLATFORM_DRI_GBM_SURFACE_H_
 
 #include "base/macros.h"
 #include "base/memory/ref_counted.h"
 #include "ui/gfx/geometry/size.h"
 #include "ui/ozone/platform/dri/scanout_surface.h"
 
 struct gbm_bo;
 struct gbm_device;
 struct gbm_surface;
 
 namespace ui {
 
 class DriBuffer;
 class DriWrapper;
+class GbmBufferBase;
 
 // Implement the ScanoutSurface interface on top of GBM (Generic Buffer
 // Manager). GBM provides generic access to hardware accelerated surfaces which
 // can be used in association with EGL to provide accelerated drawing.
 class GbmSurface : public ScanoutSurface {
  public:
   GbmSurface(gbm_device* device, DriWrapper* dri, const gfx::Size& size);
   virtual ~GbmSurface();
 
   // ScanoutSurface:
@@ skipping 11 matching lines @@
 
   DriWrapper* dri_;
 
   gfx::Size size_;
 
   // The native GBM surface. In EGL this represents the EGLNativeWindowType.
   gbm_surface* native_surface_;
 
   // Backing GBM buffers. One is the current front buffer. The other is the
   // current backbuffer that is pending scan out.
-  gbm_bo* buffers_[2];
+  scoped_refptr<GbmBufferBase> buffers_[2];
 
   // Index to the front buffer.
   int front_buffer_;
 
   // We can't lock (and get) an accelerated buffer from the GBM surface until
   // after something draws into it. But modesetting needs to happen earlier,
   // before an actual window is created and draws. So, we create a dumb buffer
   // for this purpose.
   scoped_refptr<DriBuffer> dumb_buffer_;
 
   DISALLOW_COPY_AND_ASSIGN(GbmSurface);
 };
 
 }  // namespace ui
 
 #endif  // UI_OZONE_PLATFORM_DRI_GBM_SURFACE_H_