Fix a couple of bugs relating to sending Tab info with chrome.runtime.connect and

chrome/common/extensions/api/runtime.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": "runtime",
     "documentation_permissions_required": ["runtime"],
     "types": [
       {
@@ skipping 12 matching lines @@
             "description": "This property will <b>only</b> be present on ports passed to onConnect/onConnectExternal listeners."
           }
         },
         "additionalProperties": { "type": "any"}
       },
       {
         "id": "MessageSender",
         "type": "object",
         "description": "An object containing information about the script context that sent a message or request.",
         "properties": {
-          "tab": {"$ref": "tabs.Tab", "optional": true, "description":"This property will <b>only</b> be present when the connection was opened from a tab or content script."},
-          "id": {"type": "string", "description": "The ID of the extension/app that opened the connection."}
+          "tab": {"$ref": "tabs.Tab", "optional": true, "description": "The $ref:tabs.Tab which opened the connection, if any. This property will <strong>only</strong> be present when the connection was opened from a tab (including content scripts), and <strong>only</strong> if the receiver is an extension, not an app."},
+          "id": {"type": "string", "description": "The ID of the extension or app that opened the connection."},
+          "url": {"type": "string", "optional": true, "description": "The URL of the page or frame that opened the connection. This property will <strong>only</strong> be present when the connection was opened from a tab (including content scripts)."}
         }
       }
     ],
     "properties": {
       "lastError": {
         "type": "object",
         "optional": true,
         "description": "This will be defined during an API method callback if there was an error",
         "unprivileged": true,
         "properties": {
@@ skipping 317 matching lines @@
           "optional": "true",
           "description": "Return true from the event listener if you wish to call <code>sendResponse</code> after the event listener returns."
         }
       }
 
 
 
     ]
   }
 ]