Implement a module system for the extension bindings JS.

chrome/renderer/resources/require.js

Index: chrome/renderer/resources/require.js
diff --git a/chrome/renderer/resources/require.js b/chrome/renderer/resources/require.js
index 34f3543a432fe5bcd2348aaf24c2e3b270b0eff9..ad865a7bf69db5b0f438ae0111a594f56b25c38e 100644
--- a/chrome/renderer/resources/require.js
+++ b/chrome/renderer/resources/require.js
@@ -34,7 +34,7 @@ ModuleLoader.prototype.run = function(id) {
     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;
@@ -53,7 +53,11 @@ ModuleLoader.prototype.load = function(id) {
 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) {