Add frameId to MessageSender (extension messaging API)

chrome/test/data/extensions/api_test/messaging/connect/page.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.
 
 JSON.parse = function() {
   return "JSON.parse clobbered by content script.";
 };
 
 JSON.stringify = function() {
   return "JSON.stringify clobbered by content script.";
@@ skipping 11 matching lines @@
 chrome.runtime.onConnect.addListener(function(port) {
   console.log('connected');
   port.onMessage.addListener(function(msg) {
     console.log('got ' + msg);
     if (msg.testPostMessage) {
       port.postMessage({success: true});
     } else if (msg.testPostMessageFromTab) {
       testPostMessageFromTab(port);
     } else if (msg.testSendMessageFromTab) {
       testSendMessageFromTab();
+    } else if (msg.testSendMessageFromFrame) {
+      testSendMessageFromFrame();
     } else if (msg.testDisconnect) {
       port.disconnect();
     } else if (msg.testDisconnectOnClose) {
       window.location = "about:blank";
     } else if (msg.testPortName) {
       port.postMessage({portName:port.name});
     } else if (msg.testSendMessageFromTabError) {
       testSendMessageFromTabError();
     } else if (msg.testConnectFromTabError) {
       testConnectFromTabError();
@@ skipping 16 matching lines @@
 // For test onMessage.
 function testSendMessageFromTab() {
   chrome.runtime.sendMessage({step: 1}, function(response) {
     if (response.nextStep) {
       console.log('testSendMessageFromTab sent');
       chrome.runtime.sendMessage({step: 2});
     }
   });
 }
 
+function testSendMessageFromFrame() {
+  // Add two frames. The content script declared in manifest.json (frame.js)
+  // runs in frames whose URL matches ?testSendMessageFromFrame.
+  // frame.js sends a message to the background page, which checks that
+  // sender.frameId exists and is different for both frames.
+  for (var i = 0; i < 2; ++i) {
+    var f = document.createElement('iframe');
+    f.src = '?testSendMessageFromFrame' + i;
+    document.body.appendChild(f);
+  }
+}
+
 // Tests sendMessage to an invalid extension.
 function testSendMessageFromTabError() {
   // try sending a request to a bad extension id
   chrome.runtime.sendMessage("bad-extension-id", {m: 1}, function(response) {
     var success = (response === undefined && chrome.runtime.lastError);
     chrome.runtime.sendMessage({success: success});
   });
 }
 
 // Tests connecting to an invalid extension.
 function testConnectFromTabError() {
   var port = chrome.runtime.connect("bad-extension-id");
   port.onDisconnect.addListener(function() {
     var success = (chrome.runtime.lastError ? true : false);
     chrome.runtime.sendMessage({success: success});
   });
 }
 
 // For test sendMessage.
 chrome.runtime.onMessage.addListener(function(request, sender, sendResponse) {
   chrome.test.assertEq({id: chrome.runtime.id}, sender);
   sendResponse({success: (request.step2 == 1)});
 });