WIP attempt to replace StartWorker/StopWorker IPCs with a new mojo EmbeddedWorker service.

content/public/test/mock_render_process_host.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/public/test/mock_render_process_host.h"
 
 #include <algorithm>
 #include <utility>
 #include <vector>
 
@@ skipping 234 matching lines @@
   return base::TimeDelta::FromMilliseconds(0);
 }
 
 void MockRenderProcessHost::ResumeRequestsForView(int route_id) {
 }
 
 void MockRenderProcessHost::NotifyTimezoneChange(const std::string& zone_id) {
 }
 
 ServiceRegistry* MockRenderProcessHost::GetServiceRegistry() {
-  return NULL;
+  if (!service_registry_)
+    service_registry_.reset(new ServiceRegistryImpl());
+  return service_registry_.get();
 }
 
 const base::TimeTicks& MockRenderProcessHost::GetInitTimeForNavigationMetrics()
     const {
   static base::TimeTicks dummy_time = base::TimeTicks::Now();
   return dummy_time;
 }
 
 bool MockRenderProcessHost::SubscribeUniformEnabled() const {
   return false;
@@ skipping 79 matching lines @@
   for (ScopedVector<MockRenderProcessHost>::iterator it = processes_.begin();
        it != processes_.end(); ++it) {
     if (*it == host) {
       processes_.weak_erase(it);
       break;
     }
   }
 }
 
 }  // content