Introduce WebRequestEventRouterDelegate.

chrome/common/extensions/api/web_request.json

 // 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.
 
 [
   {
     "namespace": "webRequest",
     "description": "Use the <code>chrome.webRequest</code> API to observe and analyze traffic and to intercept, block, or modify requests in-flight.",
     "properties": {
       "MAX_HANDLER_BEHAVIOR_CHANGED_CALLS_PER_10_MINUTES": {
         "value": 20,
         "description": "The maximum number of times that <code>handlerBehaviorChanged</code> can be called per 10 minute sustained interval. <code>handlerBehaviorChanged</code> is an expensive function call that shouldn't be called often."
       }
     },
     "types": [
       {
         "id": "RequestFilter",
         "type": "object",
         "description": "An object describing filters to apply to webRequest events.",
         "properties": {

[Fady Samuel, 2014/09/18 16:34:44]

Replace this block with:

"additionalProperties": {"type": "any"}

           "urls": {
             "type": "array",
             "description": "A list of URLs or URL patterns. Requests that cannot match any of the URLs will be filtered out.",
             "items": { "type": "string" }
           },
           "types": {
             "type": "array",
             "optional": true,
             "description": "A list of request types. Requests that cannot match any of the types will be filtered out.",
             "items": { "type": "string", "enum": ["main_frame", "sub_frame", "stylesheet", "script", "image", "object", "xmlhttprequest", "other"] }
           },
-          "tabId": { "type": "integer", "optional": true },
-          "windowId": { "type": "integer", "optional": true }
+          "extraRequestParams": {
+            "type": "object",
+            "optional": true,
+            "description": "A data structure that contains extra request parameters, such as tabID and windowID.",
+            "properties": {
+              "tabId": {"type": "integer", "optional": true},
+              "windowId": {"type": "integer", "optional": true}
+            }
+          }
         }
       },
       {
         "id": "HttpHeaders",
         "nocompile": true,
         "type": "array",
         "description": "An array of HTTP headers. Each header is represented as a dictionary containing the keys <code>name</code> and either <code>value</code> or <code>binaryValue</code>.",
         "items": {
           "type": "object",
           "properties": {
@@ skipping 490 matching lines @@
           {
             "$ref": "RequestFilter",
             "name": "filter",
             "description": "A set of filters that restricts the events that will be sent to this listener."
           }
         ]
       }
     ]
   }
 ]