mus: Split the gpu client-lib into a separate component.

services/ui/public/cpp/mojo_buffer_backing.cc

-// 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.
-
-#include "services/ui/public/cpp/mojo_buffer_backing.h"
-
-#include "base/logging.h"
-#include "base/memory/ptr_util.h"
-
-namespace ui {
-
-MojoBufferBacking::MojoBufferBacking(mojo::ScopedSharedBufferMapping mapping,
-                                     size_t size)
-    : mapping_(std::move(mapping)), size_(size) {}
-
-MojoBufferBacking::~MojoBufferBacking() = default;
-
-// static
-std::unique_ptr<gpu::BufferBacking> MojoBufferBacking::Create(
-    mojo::ScopedSharedBufferHandle handle,
-    size_t size) {
-  mojo::ScopedSharedBufferMapping mapping = handle->Map(size);
-  if (!mapping)
-    return nullptr;
-  return base::MakeUnique<MojoBufferBacking>(std::move(mapping), size);
-}
-void* MojoBufferBacking::GetMemory() const {
-  return mapping_.get();
-}
-size_t MojoBufferBacking::GetSize() const {
-  return size_;
-}
-
-}  // namespace ui