Implement MusGpuMemoryBufferManager

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