Convert Ozone GL OSMesa implementation.

ui/ozone/platform/cast/surface_factory_cast.h

 // Copyright 2015 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_CAST_SURFACE_FACTORY_CAST_H_
 #define UI_OZONE_PLATFORM_CAST_SURFACE_FACTORY_CAST_H_
 
 #include <memory>
 #include <vector>
 
@@ skipping 23 matching lines @@
   std::unique_ptr<SurfaceOzoneCanvas> CreateCanvasForWidget(
       gfx::AcceleratedWidget widget) override;
   scoped_refptr<NativePixmap> CreateNativePixmap(
       gfx::AcceleratedWidget widget,
       gfx::Size size,
       gfx::BufferFormat format,
       gfx::BufferUsage usage) override;
 
  private:
   std::unique_ptr<GLOzoneEglCast> egl_implementation_;
+  std::unique_ptr<GLOzone> osmesa_implementation_;
 
   DISALLOW_COPY_AND_ASSIGN(SurfaceFactoryCast);
 };
 
 }  // namespace ui
 
 #endif  // UI_OZONE_PLATFORM_CAST_SURFACE_FACTORY_CAST_H_