Complete SyncMessageFilter initialization after SyncChannel initialization

ipc/ipc_channel_proxy.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 "ipc/ipc_channel_proxy.h"
 
 #include "base/bind.h"
 #include "base/compiler_specific.h"
 #include "base/location.h"
 #include "base/memory/ref_counted.h"
@@ skipping 412 matching lines @@
     context_->ipc_task_runner()->PostTask(
         FROM_HERE, base::Bind(&Context::CreateChannel,
                               context_.get(), Passed(factory.Pass())));
   }
 
   // complete initialization on the background thread
   context_->ipc_task_runner()->PostTask(
       FROM_HERE, base::Bind(&Context::OnChannelOpened, context_.get()));
 
   did_init_ = true;
+  OnChannelInit();
 }
 
 void ChannelProxy::Close() {
   DCHECK(CalledOnValidThread());
 
   // Clear the backpointer to the listener so that any pending calls to
   // Context::OnDispatchMessage or OnDispatchError will be ignored.  It is
   // possible that the channel could be closed while it is receiving messages!
   context_->Clear();
 
@@ skipping 64 matching lines @@
   // Channel must have been created first.
   DCHECK(channel) << context_.get()->channel_id_;
   return channel->TakeClientFileDescriptor();
 }
 #endif
 
 void ChannelProxy::SetAttachmentBrokerEndpoint(bool is_endpoint) {
   context()->set_attachment_broker_endpoint(is_endpoint);
 }
 
+void ChannelProxy::OnChannelInit() {
+}
+
 //-----------------------------------------------------------------------------
 
 }  // namespace IPC