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

ui/ozone/platform/dri/gbm_buffer_base.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_BUFFER_BASE_H_
+#define UI_OZONE_PLATFORM_DRI_GBM_BUFFER_BASE_H_
+
+#include "ui/ozone/platform/dri/scanout_buffer.h"
+
+struct gbm_bo;
+
+namespace ui {
+
+class DriWrapper;
+
+// Wrapper for a GBM buffer. The base class provides common functionality
+// required to prepare the buffer for scanout. It does not provide any ownership
+// of the buffer. Implementations of this base class should deal with buffer
+// ownership.
+class GbmBufferBase : public ScanoutBuffer {
+ public:
+  gbm_bo* bo() const { return bo_; }
+
+  // ScanoutBuffer:
+  virtual uint32_t GetFramebufferId() const OVERRIDE;
+  virtual uint32_t GetHandle() const OVERRIDE;
+  virtual gfx::Size GetSize() const OVERRIDE;
+
+ protected:
+  GbmBufferBase(DriWrapper* dri, gbm_bo* bo, bool scanout);
+  virtual ~GbmBufferBase();
+
+ private:
+  DriWrapper* dri_;
+  gbm_bo* bo_;
+  uint32_t framebuffer_;
+
+  DISALLOW_COPY_AND_ASSIGN(GbmBufferBase);
+};
+
+}  // namespace ui
+
+#endif  // UI_OZONE_PLATFORM_DRI_GBM_BUFFER_BASE_H_