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

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

 /*
  * mojo-helpers contains extensions to testharness.js useful for consuming
  * and mocking Mojo services directly within test code.
  */
 '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, [
         'mojo/public/js/core',
         'mojo/public/js/router',
         'content/public/renderer/service_provider',
       ], (core, router, serviceProvider) => {
         try {
           resolve(func({
             core: core,
@@ skipping 25 matching lines @@
         reject(result.result);
         return;
       }
 
       resolve({ buffer: result.buffer, handles: result.handles });
     };
 
     wait();
   });
 };