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

content/public/test/mock_render_process_host.h

Index: content/public/test/mock_render_process_host.h
diff --git a/content/public/test/mock_render_process_host.h b/content/public/test/mock_render_process_host.h
index 0b2a7e0180ff07b4424cc1f4370432c7cf249ff0..de677d1e66b717b52b82db45f4839b68b8f6f1cc 100644
--- a/content/public/test/mock_render_process_host.h
+++ b/content/public/test/mock_render_process_host.h
@@ -17,6 +17,7 @@ class StoragePartition;
 namespace content {
 
 class MockRenderProcessHostFactory;
+class ServiceRegistryImpl;
 
 // A mock render process host that has no corresponding renderer process.  All
 // IPC messages are sent into the message sink for inspection by tests.
@@ -136,6 +137,7 @@ class MockRenderProcessHost : public RenderProcessHost {
   bool deletion_callback_called_;
   bool is_for_guests_only_;
   scoped_ptr<base::ProcessHandle> process_handle;
+  scoped_ptr<ServiceRegistryImpl> service_registry_;
 
   DISALLOW_COPY_AND_ASSIGN(MockRenderProcessHost);
 };