Enable extension APIs for content scripts.

chrome/renderer/resources/extensions/event.js

 // Copyright (c) 2011 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 = chrome || {};
 (function () {
   native function GetChromeHidden();
   native function AttachEvent(eventName);
   native function DetachEvent(eventName);
   native function Print();
 
   var chromeHidden = GetChromeHidden();
 
   // Local implementation of JSON.parse & JSON.stringify that protect us
   // from being clobbered by an extension.
+  //
+  // TODO(aa): This makes me so sad. We shouldn't need it, as we can just pass
+  // Values directly over IPC without serializing to strings and use
+  // JSONValueConverter.
   chromeHidden.JSON = new (function() {
     var $Object = Object;
     var $Array = Array;
     var $jsonStringify = JSON.stringify;
     var $jsonParse = JSON.parse;
 
     this.stringify = function(thing) {
       var customizedObjectToJSON = $Object.prototype.toJSON;
       var customizedArrayToJSON = $Array.prototype.toJSON;
       if (customizedObjectToJSON !== undefined) {
@@ skipping 215 matching lines @@
       var event = allAttachedEvents[i];
       if (event)
         event.detach_();
     }
   };
 
   chromeHidden.dispatchError = function(msg) {
     console.error(msg);
   };
 })();