Add RegisterService, split out of Connect().

services/service_manager/tests/util.h

Index: services/service_manager/tests/util.h
diff --git a/services/service_manager/tests/util.h b/services/service_manager/tests/util.h
index aac2900c9e3f70829eadcfe459430916d7fb0ed3..6fe6bc30bb66148d45f6ebfc67b87fdffe5b8986 100644
--- a/services/service_manager/tests/util.h
+++ b/services/service_manager/tests/util.h
@@ -25,7 +25,7 @@ namespace test {
 // manager.
 std::unique_ptr<Connection> LaunchAndConnectToProcess(
     const std::string& target_exe_name,
-    const Identity target,
+    const Identity& target,
     service_manager::Connector* connector,
     base::Process* process);