gpu: Use GpuMemoryBufferManager from GpuService when possible.

services/ui/public/cpp/gpu_service.cc

 // 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.
 
 #include "services/ui/public/cpp/gpu_service.h"
 
 #include "base/command_line.h"
 #include "base/memory/singleton.h"
 #include "base/threading/thread_task_runner_handle.h"
 #include "build/build_config.h"
@@ skipping 84 matching lines @@
     }
 
     // Wait until the pending establishing task is finished.
     do {
       establishing_condition_.Wait();
     } while (is_establishing_);
   }
   return gpu_channel_;
 }
 
+gpu::GpuMemoryBufferManager* GpuService::GetGpuMemoryBufferManager() {
+  return gpu_memory_buffer_manager_.get();
+}
+
 scoped_refptr<gpu::GpuChannelHost> GpuService::GetGpuChannelLocked() {
   if (gpu_channel_ && gpu_channel_->IsLost()) {
     main_task_runner_->PostTask(
         FROM_HERE,
         base::Bind(&gpu::GpuChannelHost::DestroyChannel, gpu_channel_));
     gpu_channel_ = nullptr;
   }
   return gpu_channel_;
 }
 
@@ skipping 102 matching lines @@
   MojoResult result = mojo::UnwrapSharedMemoryHandle(
       std::move(handle), &platform_handle, &shared_memory_size, &readonly);
   if (result != MOJO_RESULT_OK)
     return nullptr;
   DCHECK_EQ(shared_memory_size, size);
 
   return base::MakeUnique<base::SharedMemory>(platform_handle, readonly);
 }
 
 }  // namespace ui