mus: Get the gpu memory buffer from the window server.

services/ui/public/interfaces/gpu_service.mojom

 // Copyright 2016 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.
 
 module ui.mojom;
 
 import "gpu/ipc/common/gpu_info.mojom";
 import "gpu/ipc/common/sync_token.mojom";
 import "services/ui/public/interfaces/gpu_memory_buffer.mojom";
 import "ui/gfx/geometry/mojo/geometry.mojom";
 import "ui/gfx/mojo/buffer_types.mojom";
 
 interface GpuService {
   // Tells the GPU service to create a new channel for communication with a
   // client. The GPU service responds with client ID, IPC handle and
   // GPUInfo.
   [Sync]
   EstablishGpuChannel() => (int32 client_id,
                             handle<message_pipe> channel_handle,
                             gpu.mojom.GpuInfo gpu_info);
 
   // Tells the GPU service to create a new GPU memory buffer.
   CreateGpuMemoryBuffer(gfx.mojom.GpuMemoryBufferId id,
                         gfx.mojom.Size size,
                         gfx.mojom.BufferFormat format,
-                        gfx.mojom.BufferUsage usage,
-                        uint64 surface_id)
+                        gfx.mojom.BufferUsage usage)
       => (gfx.mojom.GpuMemoryBufferHandle buffer_handle);
 
   // Tells the GPU process to destroy GPU memory buffer.
   DestroyGpuMemoryBuffer(gfx.mojom.GpuMemoryBufferId id,
                          gpu.mojom.SyncToken sync_token);
 };