ozone: support gfx::BufferFormat::RGBX_8888 as a native pixmap format.

ui/ozone/platform/drm/gpu/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_DRM_GPU_GBM_BUFFER_BASE_H_
 #define UI_OZONE_PLATFORM_DRM_GPU_GBM_BUFFER_BASE_H_
 
 #include "ui/ozone/platform/drm/gpu/scanout_buffer.h"
 
 struct gbm_bo;
@@ skipping 11 matching lines @@
   gbm_bo* bo() const { return bo_; }
 
   // ScanoutBuffer:
   uint32_t GetFramebufferId() const override;
   uint32_t GetHandle() const override;
   gfx::Size GetSize() const override;
   uint32_t GetFramebufferPixelFormat() const override;
   bool RequiresGlFinish() const override;
 
  protected:
-  GbmBufferBase(const scoped_refptr<DrmDevice>& drm, gbm_bo* bo, bool scanout);
+  GbmBufferBase(const scoped_refptr<DrmDevice>& drm,
+                gbm_bo* bo,
+                gfx::BufferFormat format,
+                gfx::BufferUsage usage);
   ~GbmBufferBase() override;
 
  private:
   scoped_refptr<DrmDevice> drm_;
   gbm_bo* bo_;
   uint32_t framebuffer_ = 0;
-  uint32_t fb_pixel_format_ = 0;
+  uint32_t framebuffer_pixel_format_ = 0;
 
   DISALLOW_COPY_AND_ASSIGN(GbmBufferBase);
 };
 
 }  // namespace ui
 
 #endif  // UI_OZONE_PLATFORM_DRM_GPU_GBM_BUFFER_BASE_H_