Change the extension.onRequest even to include the sender info.

chrome/renderer/resources/renderer_extension_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.
 
 // This script contains unprivileged javascript APIs related to chrome
 // extensions.  It is loaded by any extension-related context, such as content
 // scripts or toolstrips.
 // See user_script_slave.cc for script that is loaded by content scripts only.
 // TODO(mpcomplete): we also load this in regular web pages, but don't need
 // to.
@@ skipping 55 matching lines @@
     // close both.
     if (targetExtensionId != chromeHidden.extensionId)
       return;  // not for us
     if (ports[getOppositePortId(portId)])
       return;  // this channel was opened by us, so ignore it
 
     // Determine whether this is coming from another extension, so we can use
     // the right event.
     var isExternal = sourceExtensionId != chromeHidden.extensionId;
 
+    if (tab)
+      tab = JSON.parse(tab);
+    var sender = {tab: tab, id: sourceExtensionId};
+
     // Special case for sendRequest/onRequest.
     if (channelName == chromeHidden.kRequestChannel) {
       var requestEvent = (isExternal ?
           chrome.extension.onRequestExternal : chrome.extension.onRequest);
       if (requestEvent.hasListeners()) {
         var port = chromeHidden.Port.createPort(portId, channelName);
         port.onMessage.addListener(function(request) {
-          requestEvent.dispatch(request, function(response) {
+          requestEvent.dispatch(request, sender, function(response) {
             port.postMessage(response);
           });
         });
       }
       return;
     }
 
     var connectEvent = (isExternal ?
         chrome.extension.onConnectExternal : chrome.extension.onConnect);
     if (connectEvent.hasListeners()) {
       var port = chromeHidden.Port.createPort(portId, channelName);
-      if (tab) {
-        tab = JSON.parse(tab);
-      }
-      port.sender = {tab: tab, id: sourceExtensionId};
+      port.sender = sender;
       // TODO(EXTENSIONS_DEPRECATED): port.tab is obsolete.
       port.tab = port.sender.tab;
 
       connectEvent.dispatch(port);
     }
   };
 
   // Called by native code when a channel has been closed.
   chromeHidden.Port.dispatchOnDisconnect = function(portId) {
     var port = ports[portId];
@@ skipping 85 matching lines @@
       });
     };
 
     // Returns a resource URL that can be used to fetch a resource from this
     // extension.
     chrome.extension.getURL = function(path) {
       return "chrome-extension://" + extensionId + "/" + path;
     };
   }
 })();