gpu: Directly cast ClientBuffer to gfx::GpuMemoryBuffer

gpu/ipc/client/command_buffer_proxy_impl.cc

 // Copyright (c) 2012 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 "gpu/ipc/client/command_buffer_proxy_impl.h"
 
 #include <utility>
 #include <vector>
 
 #include "base/callback.h"
@@ skipping 438 matching lines @@
                                             unsigned internal_format) {
   CheckLock();
   if (last_state_.error != gpu::error::kNoError)
     return -1;
 
   int32_t new_id = channel_->ReserveImageId();
 
   gpu::GpuMemoryBufferManager* gpu_memory_buffer_manager =
       channel_->gpu_memory_buffer_manager();
   gfx::GpuMemoryBuffer* gpu_memory_buffer =
-      gpu_memory_buffer_manager->GpuMemoryBufferFromClientBuffer(buffer);
+      reinterpret_cast<gfx::GpuMemoryBuffer*>(buffer);
   DCHECK(gpu_memory_buffer);
 
   // This handle is owned by the GPU process and must be passed to it or it
   // will leak. In otherwords, do not early out on error between here and the
   // sending of the CreateImage IPC below.
   bool requires_sync_token = false;
   gfx::GpuMemoryBufferHandle handle =
       channel_->ShareGpuMemoryBufferToGpuProcess(gpu_memory_buffer->GetHandle(),
                                                  &requires_sync_token);
 
@@ skipping 396 matching lines @@
     return;
   channel_->FlushPendingStream(stream_id_);
   channel_->Send(new GpuChannelMsg_DestroyCommandBuffer(route_id_));
   channel_->RemoveRoute(route_id_);
   channel_ = nullptr;
   if (gpu_control_client_)
     gpu_control_client_->OnGpuControlLostContext();
 }
 
 }  // namespace gpu