Allow cmdbuffer creation from compositor thread.

content/renderer/gpu/command_buffer_proxy.cc

 // Copyright (c) 2011 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/renderer/gpu/command_buffer_proxy.h"
 
 #include "base/debug/trace_event.h"
 #include "base/logging.h"
 #include "base/process_util.h"
 #include "base/shared_memory.h"
@@ skipping 390 matching lines @@
     LOG(ERROR) << "Send(GpuChannelMsg_CreateVideoDecoder) failed";
     return NULL;
   }
 
   scoped_refptr<GpuVideoDecodeAcceleratorHost> decoder_host =
       new GpuVideoDecodeAcceleratorHost(channel_, decoder_route_id, client);
   bool inserted = video_decoder_hosts_.insert(std::make_pair(
       decoder_route_id, decoder_host)).second;
   DCHECK(inserted);
 
-  channel_->AddRoute(decoder_route_id, decoder_host.get());
+  channel_->AddRoute(decoder_route_id, decoder_host->AsWeakPtr());
 
   return decoder_host;
 }
 
 #if defined(OS_MACOSX)
 void CommandBufferProxy::SetWindowSize(const gfx::Size& size) {
   if (last_state_.error != gpu::error::kNoError)
     return;
 
   Send(new GpuCommandBufferMsg_SetWindowSize(route_id_, size));
@@ skipping 21 matching lines @@
   delete msg;
   return false;
 }
 
 void CommandBufferProxy::OnUpdateState(const gpu::CommandBuffer::State& state) {
   // Handle wraparound. It works as long as we don't have more than 2B state
   // updates in flight across which reordering occurs.
   if (state.generation - last_state_.generation < 0x80000000U)
     last_state_ = state;
 }