services/ui: Implement MojoGpuMemoryBufferManager::CreateGpuMemoryBufferFromHandle

services/ui/public/cpp/mojo_gpu_memory_buffer.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 SERVICES_UI_PUBLIC_CPP_MOJO_GPU_MEMORY_BUFFER_H_
 #define SERVICES_UI_PUBLIC_CPP_MOJO_GPU_MEMORY_BUFFER_H_
 
 #include <stddef.h>
 
 #include <memory>
 
 #include "base/macros.h"
 #include "services/ui/public/cpp/gpu_memory_buffer_impl.h"
 #include "ui/gfx/geometry/size.h"
 #include "ui/gfx/gpu_memory_buffer.h"
 
 namespace ui {
 
 class MojoGpuMemoryBufferImpl : public ui::GpuMemoryBufferImpl {
  public:
   MojoGpuMemoryBufferImpl(const gfx::Size& size,
                           gfx::BufferFormat format,
                           std::unique_ptr<base::SharedMemory> shared_memory);
   ~MojoGpuMemoryBufferImpl() override;
 
   static std::unique_ptr<gfx::GpuMemoryBuffer> Create(const gfx::Size& size,
                                                       gfx::BufferFormat format,
                                                       gfx::BufferUsage usage);
-
+  static std::unique_ptr<gfx::GpuMemoryBuffer> CreateFromHandle(
+      const gfx::GpuMemoryBufferHandle& handle,
+      const gfx::Size& size,
+      gfx::BufferFormat format,
+      gfx::BufferUsage usage);
   static MojoGpuMemoryBufferImpl* FromClientBuffer(ClientBuffer buffer);
 
   const unsigned char* GetMemory() const;
 
   // Overridden from gfx::GpuMemoryBuffer:
   bool Map() override;
   void* memory(size_t plane) override;
   void Unmap() override;
   int stride(size_t plane) const override;
   gfx::GpuMemoryBufferHandle GetHandle() const override;
 
   // Overridden from gfx::GpuMemoryBufferImpl
   gfx::GpuMemoryBufferType GetBufferType() const override;
 
  private:
   std::unique_ptr<base::SharedMemory> shared_memory_;
 
   DISALLOW_COPY_AND_ASSIGN(MojoGpuMemoryBufferImpl);
 };
 
 }  // namespace ui
 
 #endif  // SERVICES_UI_PUBLIC_CPP_MOJO_GPU_MEMORY_BUFFER_H_