[Do not commit] Sample USB layout tests with Mojo service mocks

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 625d7fdfe46e06c320489bf8f8267644dfb9c658..9abc3302b2fa471cf9451379ae1c72f757798e85 100644
--- a/third_party/WebKit/LayoutTests/resources/mojo-helpers.js
+++ b/third_party/WebKit/LayoutTests/resources/mojo-helpers.js
@@ -4,14 +4,14 @@
  */
 'use strict';
 
+// Fix up the global window.define, since all baked-in Mojo modules expect to
+// find it there.
+window.define = mojo.define;
+
 // Runs a promise_test which depends on the Mojo system API modules available to
 // all layout tests. The test implementation function is called with an Object
 // that exposes common Mojo module interfaces.
 function mojo_test(func, name, properties) {
-  // Fix up the global window.define, since all baked-in Mojo modules expect to
-  // find it there.
-  window.define = mojo.define;
-
   promise_test(() => {
     return new Promise((resolve, reject) => {
       define('Mojo layout test module: ' + name, [