Lazy load chrome.* APIs

chrome/renderer/resources/extensions/utils.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.
 
+var chrome = requireNative('chrome').GetChrome();
+
 function forEach(dict, f) {
   for (var key in dict) {
     if (dict.hasOwnProperty(key))
       f(key, dict[key]);
   }
 }
 
 // Assuming |array_of_dictionaries| is structured like this:
 // [{id: 1, ... }, {id: 2, ...}, ...], you can use
 // lookup(array_of_dictionaries, 'id', 2) to get the dictionary with id == 2.
 function lookup(array_of_dictionaries, field, value) {
   var filter = function (dict) {return dict[field] == value;};
   var matches = array_of_dictionaries.filter(filter);
   if (matches.length == 0) {
     return undefined;
   } else if (matches.length == 1) {
     return matches[0]
   } else {
     throw new Error("Failed lookup of field '" + field + "' with value '" +
                     value + "'");
   }
 }
 
+// Specify |currentApi| if this should return an API for $refs in the current
+// namespace.
+function loadRefDependency(ref, currentApi) {
+  var parts = ref.split(".");
+  if (parts.length > 1)
+    return chrome[parts.slice(0, parts.length - 1).join(".")];
+  else
+    return currentApi;
+}
+
 exports.forEach = forEach;
+exports.loadRefDependency = loadRefDependency;
 exports.lookup = lookup;