exo: Directly create GpuMemoryBufferImpl when a handle is available.

services/ui/public/cpp/gpu/client_gpu_memory_buffer_manager.cc

 // 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.
 
 #include "services/ui/public/cpp/gpu/client_gpu_memory_buffer_manager.h"
 
 #include "base/bind.h"
 #include "base/logging.h"
 #include "base/memory/ptr_util.h"
 #include "base/memory/shared_memory.h"
@@ skipping 113 matching lines @@
           gmb_handle, size, format, usage,
           base::Bind(&NotifyDestructionOnCorrectThread, thread_.task_runner(),
                      callback)));
   if (!buffer) {
     DeletedGpuMemoryBuffer(gmb_handle.id, gpu::SyncToken());
     return nullptr;
   }
   return std::move(buffer);
 }
 
-std::unique_ptr<gfx::GpuMemoryBuffer>
-ClientGpuMemoryBufferManager::CreateGpuMemoryBufferFromHandle(
-    const gfx::GpuMemoryBufferHandle& handle,
-    const gfx::Size& size,
-    gfx::BufferFormat format) {
-  NOTIMPLEMENTED();
-  return nullptr;
-}
-
 void ClientGpuMemoryBufferManager::SetDestructionSyncToken(
     gfx::GpuMemoryBuffer* buffer,
     const gpu::SyncToken& sync_token) {
   static_cast<gpu::GpuMemoryBufferImpl*>(buffer)->set_destruction_sync_token(
       sync_token);
 }
 
 }  // namespace ui