Start of foreign fetch implementation.

content/browser/service_worker/embedded_worker_instance.cc

 // Copyright 2013 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/browser/service_worker/embedded_worker_instance.h"
 
 #include "base/bind_helpers.h"
 #include "base/metrics/histogram_macros.h"
 #include "base/threading/non_thread_safe.h"
 #include "base/trace_event/trace_event.h"
@@ skipping 62 matching lines @@
       FROM_HERE,
       base::Bind(callback, worker_devtools_agent_route_id, wait_for_debugger));
 }
 
 void SetupMojoOnUIThread(
     int process_id,
     int thread_id,
     mojo::InterfaceRequest<mojo::ServiceProvider> services,
     mojo::InterfacePtrInfo<mojo::ServiceProvider> exposed_services) {
   RenderProcessHost* rph = RenderProcessHost::FromID(process_id);
-  // |rph| may be NULL in unit tests.
-  if (!rph)
+  // |rph| or its ServiceRegistry may be NULL in unit tests.
+  if (!rph || !rph->GetServiceRegistry())
     return;
   EmbeddedWorkerSetupPtr setup;
   rph->GetServiceRegistry()->ConnectToRemoteService(mojo::GetProxy(&setup));
   setup->ExchangeServiceProviders(thread_id, services.Pass(),
                                   mojo::MakeProxy(exposed_services.Pass()));
 }
 
 }  // namespace
 
 // Lives on IO thread, proxies notifications to DevToolsManager that lives on
@@ skipping 470 matching lines @@
     case SCRIPT_READ_FINISHED:
       return "Script read finished";
     case STARTING_PHASE_MAX_VALUE:
       NOTREACHED();
   }
   NOTREACHED() << phase;
   return std::string();
 }
 
 }  // namespace content