Introduce WebRequestEventRouterDelegate.

chrome/test/data/extensions/api_test/webrequest/test_complex.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.
 
 function getURLHttpXHR() {
   return getServerURL('extensions/api_test/webrequest/xhr/a.html');
 }
 function getURLHttpXHRJavaScript() {
   return getServerURL('extensions/api_test/webrequest/xhr/a.js');
 }
@@ skipping 194 matching lines @@
         },
       ],
       [  // event order
         ["a-onBeforeRequest", "a-onResponseStarted",
          "b-onBeforeRequest", "b-onResponseStarted"],
         ["a-onResponseStarted", "a-onCompleted"],
         ["b-onResponseStarted", "b-onCompleted"] ],
       {  // filters
         urls: [getURL("complexLoad/*")],
         types: ["main_frame", "image"],
-        tabId: tabId
+        extraRequestParams: {
+          tabId: tabId,
+        }
       });
     chrome.tabs.create({ url: getURL("simpleLoad/a.html") },
         function(newTab) {
       chrome.tabs.remove(newTab.id);
       navigateAndWait(getURL("complexLoad/a.html"));
     });
   },
 
   // Navigates to a page to generates an XHR.
   function xhrLoad() {
@@ skipping 157 matching lines @@
         }
       ],
       [  // event order
         ["onBeforeRequest-1", "onBeforeSendHeaders-1", "onSendHeaders-1",
          "onHeadersReceived-1", "onResponseStarted-1", "onCompleted-1",
          "onBeforeRequest-2", "onBeforeSendHeaders-2", "onSendHeaders-2",
          "onHeadersReceived-2", "onResponseStarted-2", "onCompleted-2"] ]);
     navigateAndWait(getURLHttpXHR());
   },
 ]);