Lazily require types when validating Extensions API calls

chrome/renderer/resources/extensions/content_settings_custom_bindings.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.
-
-// Custom binding for the contentSettings API.
-
-var binding = require('binding').Binding.create('contentSettings');
-
-var sendRequest = require('sendRequest').sendRequest;
-var validate = require('schemaUtils').validate;
-
-binding.registerCustomType('contentSettings.ContentSetting', function() {
-  function extendSchema(schema) {
-    var extendedSchema = schema.slice();
-    extendedSchema.unshift({'type': 'string'});
-    return extendedSchema;
-  }
-
-  function ContentSetting(contentType, settingSchema) {
-    this.get = function(details, callback) {
-      var getSchema = this.functionSchemas.get.definition.parameters;
-      validate([details, callback], getSchema);
-      return sendRequest('contentSettings.get',
-                         [contentType, details, callback],
-                         extendSchema(getSchema));
-    };
-    this.set = function(details, callback) {
-      var setSchema = this.functionSchemas.set.definition.parameters.slice();
-      setSchema[0].properties.setting = settingSchema;
-      validate([details, callback], setSchema);
-      return sendRequest('contentSettings.set',
-                         [contentType, details, callback],
-                         extendSchema(setSchema));
-    };
-    this.clear = function(details, callback) {
-      var clearSchema = this.functionSchemas.clear.definition.parameters;
-      validate([details, callback], clearSchema);
-      return sendRequest('contentSettings.clear',
-                         [contentType, details, callback],
-                         extendSchema(clearSchema));
-    };
-    this.getResourceIdentifiers = function(callback) {
-      var schema =
-          this.functionSchemas.getResourceIdentifiers.definition.parameters;
-      validate([callback], schema);
-      return sendRequest(
-          'contentSettings.getResourceIdentifiers',
-          [contentType, callback],
-          extendSchema(schema));
-    };
-  }
-
-  return ContentSetting;
-});
-
-exports.binding = binding.generate();