Improve <adview> implementation and add tests.

chrome/test/data/extensions/platform_apps/ad_view/src_not_exposed/chrometest.js

Index: chrome/test/data/extensions/platform_apps/ad_view/src_not_exposed/chrometest.js
diff --git a/chrome/test/data/extensions/platform_apps/ad_view/src_not_exposed/chrometest.js b/chrome/test/data/extensions/platform_apps/ad_view/src_not_exposed/chrometest.js
new file mode 100644
index 0000000000000000000000000000000000000000..f6bf10d5ce11b356f28340b12053a18819b12d61
--- /dev/null
+++ b/chrome/test/data/extensions/platform_apps/ad_view/src_not_exposed/chrometest.js
@@ -0,0 +1,30 @@
+// Copyright 2013 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 test checks 1) an <adview> works end-to-end (i.e. page is loaded) when
+// using a whitelisted ad-network, and 2) the "src" attribute is never exposed
+// to the application.
+
+function runTests() {
+  chrome.test.runTests([
+    function test() {
+      var adview = document.getElementsByTagName("adview")[0];
+      adview.addEventListener("loadcommit", function(e){
+        chrome.test.assertEq(false, adview.hasAttribute("src"));
+        chrome.test.assertEq(null, adview.getAttribute("src"));
+        chrome.test.assertEq(undefined, adview['src']);
+        chrome.test.assertEq(undefined, adview.src);
+        console.log("Properties and attributes are inactive.");
+        chrome.test.succeed();
+      });
+      adview.setAttribute('ad-network', 'admob');
+    }
+  ]);
+}
+
+window.onload = function() {
+  chrome.test.getConfig(function(config) {
+    runTests();
+  });
+}