Refactor gpu::Buffer to allow different types of backing

content/common/gpu/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 "content/common/gpu/client/command_buffer_proxy_impl.h"
 
 #include "base/callback.h"
 #include "base/debug/trace_event.h"
 #include "base/logging.h"
 #include "base/memory/shared_memory.h"
@@ skipping 268 matching lines @@
     return NULL;
 
   if (!Send(new GpuCommandBufferMsg_RegisterTransferBuffer(route_id_,
                                                            new_id,
                                                            handle,
                                                            size))) {
     return NULL;
   }
 
   *id = new_id;
-  scoped_refptr<gpu::Buffer> buffer =
-      new gpu::Buffer(shared_memory.Pass(), size);
+  scoped_refptr<gpu::Buffer> buffer(
+      gpu::MakeBufferFromSharedMemory(shared_memory.Pass(), size));
   return buffer;
 }
 
 void CommandBufferProxyImpl::DestroyTransferBuffer(int32 id) {
   if (last_state_.error != gpu::error::kNoError)
     return;
 
   Send(new GpuCommandBufferMsg_DestroyTransferBuffer(route_id_, id));
 }
 
@@ skipping 217 matching lines @@
     const GpuConsoleMessageCallback& callback) {
   console_message_callback_ = callback;
 }
 
 void CommandBufferProxyImpl::TryUpdateState() {
   if (last_state_.error == gpu::error::kNoError)
     shared_state()->Read(&last_state_);
 }
 
 }  // namespace content