Add a Javascript wrapper for InterfaceRegistry.

third_party/WebKit/LayoutTests/resources/mojo-helpers.js

Index: third_party/WebKit/LayoutTests/resources/mojo-helpers.js
diff --git a/third_party/WebKit/LayoutTests/resources/mojo-helpers.js b/third_party/WebKit/LayoutTests/resources/mojo-helpers.js
index 7553fa5ba63a1d93974e78888c5739a9405855ae..1d9438c542eb5399884353444bb94b5bc967a8f2 100644
--- a/third_party/WebKit/LayoutTests/resources/mojo-helpers.js
+++ b/third_party/WebKit/LayoutTests/resources/mojo-helpers.js
@@ -32,8 +32,11 @@ define('Mojo Helpers', [
     'mojo/public/js/router',
     'mojo/public/js/support',
     'content/public/renderer/frame_interfaces',
+    'content/public/renderer/frame_interface_registry',
     'content/public/renderer/interfaces',
-], (core, router, support, frameInterfaces, interfaces) => {
+    'content/public/renderer/interface_registry',
+], (core, router, support, frameInterfaces, frameInterfaceRegistry,
+    interfaces, interfaceRegistry) => {
   let tearDown = () => {
     frameInterfaces.clearInterfaceOverridesForTesting();
     interfaces.clearInterfaceOverridesForTesting();
@@ -47,7 +50,9 @@ define('Mojo Helpers', [
     router,
     support,
     frameInterfaces,
+    frameInterfaceRegistry,
     interfaces,
+    interfaceRegistry,
   };
 });