Use mus::MojoGpuMemoryBufferManager in mus::GpuService.

components/mus/common/mojo_buffer_backing.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 COMPONENTS_MUS_GLES2_MOJO_BUFFER_BACKING_H_
-#define COMPONENTS_MUS_GLES2_MOJO_BUFFER_BACKING_H_
+#ifndef COMPONENTS_MUS_COMMON_MOJO_BUFFER_BACKING_H_
+#define COMPONENTS_MUS_COMMON_MOJO_BUFFER_BACKING_H_
 
 #include <stddef.h>
 
 #include <memory>
 
 #include "base/macros.h"
+#include "components/mus/common/mus_common_export.h"
 #include "gpu/command_buffer/common/buffer.h"
 #include "mojo/public/cpp/system/core.h"
 
 namespace mus {
 
-class MojoBufferBacking : public gpu::BufferBacking {
+class MUS_COMMON_EXPORT MojoBufferBacking : public gpu::BufferBacking {
  public:
   MojoBufferBacking(mojo::ScopedSharedBufferHandle handle,
                     void* memory,
                     size_t size);
   ~MojoBufferBacking() override;
 
   static std::unique_ptr<gpu::BufferBacking> Create(
       mojo::ScopedSharedBufferHandle handle,
       size_t size);
 
   void* GetMemory() const override;
   size_t GetSize() const override;
 
  private:
   mojo::ScopedSharedBufferHandle handle_;
   void* memory_;
   size_t size_;
 
   DISALLOW_COPY_AND_ASSIGN(MojoBufferBacking);
 };
 
 }  // namespace mus
 
-#endif  // COMPONENTS_MUS_GLES2_MOJO_BUFFER_BACKING_H_
+#endif  // COMPONENTS_MUS_COMMON_MOJO_BUFFER_BACKING_H_