Implement chrome.extension.connectExternal and fix various API inconsistencies.

chrome/renderer/resources/event_bindings.js

 // Copyright (c) 2009 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.
 
-// -----------------------------------------------------------------------------
-// NOTE: If you change this file you need to touch renderer_resources.grd to
-// have your change take effect.
-// -----------------------------------------------------------------------------
-
 var chrome = chrome || {};
 (function () {
   native function GetChromeHidden();
   native function AttachEvent(eventName);
   native function DetachEvent(eventName);
 
   var chromeHidden = GetChromeHidden();
 
   // Event object.  If opt_eventName is provided, this object represents
   // the unique instance of that named event, and dispatching an event
@@ skipping 78 matching lines @@
     if (this.listeners_.length == 0) {
       this.detach_();
     }
   };
 
   // Test if the given callback is registered for this event.
   chrome.Event.prototype.hasListener = function(cb) {
     return this.findListeners_(cb) > -1;
   };
 
+  // Test if any callbacks are registered for this event.
+  chrome.Event.prototype.hasListeners = function(cb) {
+    return this.listeners_.length > 0;
+  };
+
   // Returns the index of the given callback if registered, or -1 if not
   // found.
   chrome.Event.prototype.findListener_ = function(cb) {
     for (var i = 0; i < this.listeners_.length; i++) {
       if (this.listeners_[i] == cb) {
         return i;
       }
     }
 
     return -1;
@@ skipping 64 matching lines @@
   chromeHidden.dispatchOnUnload = function() {
     chromeHidden.onUnload.dispatch();
     for (var i in allAttachedEvents)
       allAttachedEvents[i].detach_();
   }
 
   chromeHidden.dispatchError = function(msg) {
     console.error(msg);
   }
 })();