Implement externally_connectable! Web pages can now communicate directly with

chrome/renderer/resources/extensions/runtime_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 runtime API.
 
 var binding = require('binding').Binding.create('runtime');
 
 var extensionNatives = requireNative('extension');
 var miscBindings = require('miscellaneous_bindings');
@@ skipping 64 matching lines @@
 
   apiFunctions.setUpdateArgumentsPreValidate('connectNative',
                                              function(appName) {
     if (typeof(appName) !== 'string') {
       throw new Error('Invalid arguments to connectNative.');
     }
     return [appName];
   });
 
   apiFunctions.setHandleRequest('connect', function(targetId, connectInfo) {
+    // Don't let orphaned content scripts communicate with their extension.
+    // http://crbug.com/168263
+    if (unloadEvent.wasDispatched)
+      throw new Error('Error connecting to extension ' + targetId);
+
     if (!targetId)
       targetId = runtime.id;
+
     var name = '';
     if (connectInfo && connectInfo.name)
       name = connectInfo.name;
 
-    // Don't let orphaned content scripts communicate with their extension.
-    // http://crbug.com/168263
-    if (!unloadEvent.wasDispatched) {
-      var portId = runtimeNatives.OpenChannelToExtension(runtime.id,
-                                                         targetId,
-                                                         name);
-      if (portId >= 0)
-        return miscBindings.createPort(portId, name);
-    }
-    throw new Error('Error connecting to extension ' + targetId);
+    var portId = runtimeNatives.OpenChannelToExtension(targetId, name);
+    if (portId >= 0)
+      return miscBindings.createPort(portId, name);
   });
 
   //
   // Privileged APIs.
   //
   if (contextType != 'BLESSED_EXTENSION')
     return;
 
   apiFunctions.setHandleRequest('connectNative',
                                 function(nativeAppName) {
@@ skipping 11 matching lines @@
     if (request.callback) {
       var bg = extensionNatives.GetExtensionViews(-1, 'BACKGROUND')[0] || null;
       request.callback(bg);
     }
     request.callback = null;
   });
 
 });
 
 exports.binding = binding.generate();