Refactor gpu::Buffer to allow different types of backing

mojo/gles2/command_buffer_client_impl.cc

 // Copyright 2014 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 "mojo/gles2/command_buffer_client_impl.h"
 
 #include <limits>
 
 #include "base/logging.h"
 #include "base/process/process_handle.h"
@@ skipping 107 matching lines @@
   if (!base::SharedMemory::IsHandleValid(handle))
     return NULL;
 
   *id = ++next_transfer_buffer_id_;
 
   AllocationScope scope;
   command_buffer_->RegisterTransferBuffer(
       *id, handle, static_cast<uint32_t>(size));
 
   scoped_refptr<gpu::Buffer> buffer =
-      new gpu::Buffer(shared_memory.Pass(), size);
+      gpu::MakeBufferFromSharedMemory(shared_memory.Pass(), size);
   return buffer;
 }
 
 void CommandBufferClientImpl::DestroyTransferBuffer(int32 id) {
   command_buffer_->DestroyTransferBuffer(id);
 }
 
 gpu::Capabilities CommandBufferClientImpl::GetCapabilities() {
   // TODO(piman)
   NOTIMPLEMENTED();
@@ skipping 98 matching lines @@
     return;
   }
 }
 
 void CommandBufferClientImpl::DrawAnimationFrame() {
   delegate_->DrawAnimationFrame();
 }
 
 }  // namespace gles2
 }  // namespace mojo