Implement a module system for the extension bindings JS.

chrome/renderer/resources/extensions/bootstrap.js

+(function(browser, extensionId, isExtensionProcess, isIncognitoProcess,
+    manifestVersion, allowExtensionAPIs) {
+
+var GetExtensionAPIDefinition = browser.natives.GetExtensionAPIDefinition;
+var GetChromeHidden = browser.natives.GetChromeHidden;
+
+function wrap(source) {
+  return "(function(require, exports, natives) {" + source + "\n})";
+}
+
+function ModuleLoader() {
+  this.cache_ = {};
+};
+
+ModuleLoader.prototype.execute = function(id) {
+  var source = browser.GetSource(id);
+  if (!source) {
+    return null;
+  }
+  var wrappedSource = wrap(source);
+  var f = browser.Execute(wrappedSource);
+  var exports = {};
+  f(require, exports, browser.natives);
+  return exports;
+};
+
+ModuleLoader.prototype.load = function(id) {
+  var exports = this.cache_[id];
+  if (exports) {
+    return exports;
+  }
+  var exports = this.execute(id);
+  this.cache_[id] = exports;
+  return exports;
+};
+
+var moduleLoader = new ModuleLoader();
+
+function require(moduleId) {
+  return moduleLoader.load(moduleId);
+}
+
+require('app');
+require('webstore');
+
+if (allowExtensionAPIs) {
+  require('event_bindings');
+  require('miscellaneous_bindings');
+  require('json_schema');
+  require('schema_generated_bindings');
+  require('apitest');
+
+  GetExtensionAPIDefinition().forEach(function(apiDef) {
+    var apiName = apiDef.namespace;
+    if (browser.natives.AllowAPI(apiName)) {
+      require('custom/' + apiName);
+    }
+  });
+
+  GetChromeHidden().dispatchOnLoad(extensionId, isExtensionProcess,
+      isIncognitoProcess, manifestVersion);
+}
+
+});