Implement a module system for the extension bindings JS.

chrome/renderer/resources/require.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.
 
 // This file should define a function that returns a require() method that can
 // be used to load JS modules.
 //
 // A module works the same as modules in node.js - JS script that populates
 // an exports object, which is what require()ers get returned. The JS in a
 // module will be run at most once as the exports result is cached.
@@ skipping 16 matching lines @@
 function ModuleLoader() {
   this.cache_ = {};
 };
 
 ModuleLoader.prototype.run = function(id) {
   var source = bootstrap.GetSource(id);
   if (!source) {
     return null;
   }
   var wrappedSource = wrap(source);
-  var f = bootstrap.Run(wrappedSource);
+  var f = bootstrap.Run(wrappedSource, id);
   var exports = {};
   f(require, requireNative, exports);
   return exports;
 };
 
 ModuleLoader.prototype.load = function(id) {
   var exports = this.cache_[id];
   if (exports) {
     return exports;
   }
   exports = this.run(id);
   this.cache_[id] = exports;
   return exports;
 };
 
 var moduleLoader = new ModuleLoader();
 
 function requireNative(nativeName) {
-  return bootstrap.GetNative(nativeName);
+  var result = bootstrap.GetNative(nativeName);
+  if (!result) {
+    throw "No such native object: '" + nativeName + "'";
+  }
+  return result;
 }
 
 function require(moduleId) {
   return moduleLoader.load(moduleId);
 }
 
 return require;
 });