Improve <adview> implementation and add tests.

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

Index: chrome/test/data/extensions/platform_apps/ad_view/properties_exposed/chrometest.js
diff --git a/chrome/test/data/extensions/platform_apps/ad_view/properties_exposed/chrometest.js b/chrome/test/data/extensions/platform_apps/ad_view/properties_exposed/chrometest.js
new file mode 100644
index 0000000000000000000000000000000000000000..463127550c4952dd52cf9c63bd769ae57677043b
--- /dev/null
+++ b/chrome/test/data/extensions/platform_apps/ad_view/properties_exposed/chrometest.js
@@ -0,0 +1,38 @@
+// 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 that <adview> attributes are also exposed as properties
+// (with the same name and value).
+
+function runTests(guestURL) {
+  chrome.test.runTests([
+    function test() {
+      var adview = document.getElementsByTagName('adview')[0];
+      var adnetwork = adview.getAttribute('ad-network');
+
+      adview.setAttribute('src', guestURL);
+
+      // Timeout is necessary to give the mutation observers a chance to fire.
+      // http://lists.w3.org/Archives/Public/public-webapps/2011JulSep/1622.html
+      setTimeout(function() {
+        chrome.test.assertEq(guestURL, adview.getAttribute('src'));
+        chrome.test.assertEq(guestURL, adview['src']);
+
+        chrome.test.assertEq(adnetwork, adview.getAttribute('ad-network'));
+        chrome.test.assertEq(adnetwork, adview['ad-network']);
+
+        console.log("Properties verified.");
+        chrome.test.succeed();
+      }, 0);
+    }
+  ]);
+}
+
+window.onload = function() {
+  chrome.test.getConfig(function(config) {
+    var guestURL = 'http://localhost:' + config.testServer.port +
+      '/files/extensions/platform_apps/ad_view/ad_network_site/testsdk.html';
+    runTests(guestURL);
+  });
+}