Move importModules function to util.js

ui/webui/resources/js/util.js

 // Copyright (c) 2012 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 // <include src="assert.js">
 
 /**
  * Alias for document.getElementById. Found elements must be HTMLElements.
  * @param {string} id The ID of the element to find.
  * @return {HTMLElement} The found element or null if not found.
@@ skipping 468 matching lines @@
         case 0xdb: return '[';
         case 0xdd: return ']';
       }
       return 'Unidentified';
     }
   });
 } else {
   window.console.log("KeyboardEvent.Key polyfill not required");
 }
 // </if>  /* is_ios */
+
+/**
+ * Helper to convert callback-based define() API to a promise-based API.
+ * @suppress {undefinedVars}
+ * @param {!Array<string>} moduleNames
+ * @return {!Promise}
+ */
+function importModules(moduleNames) {
+  return new Promise(function(resolve) {
+    define(moduleNames, function() {
+      resolve(Array.from(arguments));
+    });
+  });
+}