mojo/gpu: use SharedBuffer instead of base::SharedMemory with hacks

mojo/services/gles2/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 MOJO_SERVICES_GLES2_MOJO_BUFFER_BACKING_H_
+#define MOJO_SERVICES_GLES2_MOJO_BUFFER_BACKING_H_
+
+#include "base/memory/scoped_ptr.h"
+#include "gpu/command_buffer/common/buffer.h"
+#include "mojo/public/cpp/system/core.h"
+
+namespace mojo {
+namespace gles2 {
+
+class MojoBufferBacking : public gpu::BufferBacking {
+ public:
+  MojoBufferBacking(mojo::ScopedSharedBufferHandle handle,
+                    void* memory,
+                    size_t size);
+  virtual ~MojoBufferBacking();
+
+  static scoped_ptr<gpu::BufferBacking> Create(
+      mojo::ScopedSharedBufferHandle handle,
+      size_t size);
+
+  virtual void* GetMemory() const OVERRIDE;
+  virtual size_t GetSize() const OVERRIDE;
+
+ private:
+  mojo::ScopedSharedBufferHandle handle_;
+  void* memory_;
+  size_t size_;
+
+  DISALLOW_COPY_AND_ASSIGN(MojoBufferBacking);
+};
+
+}  // namespace gles2
+}  // namespace mojo
+
+#endif  // MOJO_SERVICES_GLES2_MOJO_BUFFER_BACKING_H_