Improve <adview> implementation and add tests.

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

Index: chrome/test/data/extensions/platform_apps/ad_view/invalid_ad_network/chrometest.js
diff --git a/chrome/test/data/extensions/platform_apps/ad_view/invalid_ad_network/chrometest.js b/chrome/test/data/extensions/platform_apps/ad_view/invalid_ad_network/chrometest.js
new file mode 100644
index 0000000000000000000000000000000000000000..77f594c63c937e982157e396bd98a8483cc05d97
--- /dev/null
+++ b/chrome/test/data/extensions/platform_apps/ad_view/invalid_ad_network/chrometest.js
@@ -0,0 +1,77 @@
+// 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 an invalid "ad-network" value (i.e. not whitelisted)
+// is ignored.
+
+var adview1 = "adview1";
+var adview2 = "adview2";
+var adview3 = "adview3";
+
+/**
+ * Verify setting invalid ad-network value is ignored in immediate Javascript
+ * code (i.e. before document is fully loaded) on a static <adview> element.
+ */
+function runTest1() {
+  var adview = document.getElementById(adview1);
+
+  adview.setAttribute("ad-network", "invalidAdNetwork");
+
+  // 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("", adview.getAttribute("ad-network"));
+    console.log("test1 succeeded.");
+  }, 0);
+}
+
+/**
+ * Verify setting invalid ad-network value is ignored at "document load" time.
+ */
+function runTest2(nextTest) {
+  var adview = document.createElement("adview");
+  adview.id = adview2;
+  document.body.appendChild(adview);
+
+  adview.setAttribute("ad-network", "invalidAdNetwork2");
+
+  // 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("", adview.getAttribute("ad-network"));
+    console.log("test2 succeeded.");
+    nextTest();
+  }, 0);
+}
+
+/**
+ * Verify setting invalid ad-network value is ignored even after document
+ * is fully loaded.
+ */
+function runTest3() {
+  // Timeout to ensure the code runs after the "loaded" event.
+  setTimeout(function() {
+    var adview = document.createElement("adview");
+    adview.id = adview3;
+    document.body.appendChild(adview);
+
+    adview.setAttribute("ad-network", "invalidAdNetwork3");
+
+    // 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("", adview.getAttribute("ad-network"));
+      console.log("test3 succeeded.");
+      chrome.test.succeed();
+    }, 0);
+  }, 0);
+}
+
+runTest1();
+
+window.addEventListener('DOMContentLoaded', function() {
+  // Pass "runTest3" as "nextTest" to ensure runTest2 fully finishes
+  // before test3 is started.
+  runTest2(runTest3);
+});