Enable <adview> tag for packaged apps.

chrome/test/data/extensions/platform_apps/ad_view/ad_network/test_sdk.js

+(function( window ) {
+  "use strict";
+
+  var document = window.document;
+
+  var ad_urls = [
+    'ads/image315.png',
+    'ads/image316.png',
+    'ads/image317.png',
+    'ads/image318.png',
+    'ads/image319.png',
+  ];
+
+  // Pick a random ad url
+  function getAdUrl(index) {
+    if (typeof index === "undefined")
+      index = Math.floor(Math.random() * ad_urls.length);
+    var ad_path = ad_urls[index];
+    var prefix_index = location.href.lastIndexOf("/");
+    return location.href.substr(0, prefix_index) + "/" + ad_path;

[asargent_no_longer_on_chrome, 2013/03/11 19:10:14]

FYI, we are usually careful about using randomness in tests because it can cause
flaky failures that might be hard to reproduce. In this case since you're just
picking from a static list of images it should be ok.

But just keep in mind that for using random "functional" behavior, we want to at
a minimum have a way to make tests with randomness repeatable (eg have them pick
a seed for the random number generator and print that out along with failure
information, and a way to pass that seed in as an input so you can diagnose
failures). 

[rpaquay, 2013/03/12 19:56:48]

We actually don't need the randomness for tests, so I removed it.

+  }
+
+  //
+  // Send a message to the embedding app
+  //
+  var message_sequence_number = 0;
+
+  function sendAppMessage(source, message, publisher_data, message_data) {
+    source.postMessage({
+      'sequence_number': message_sequence_number,
+      'message': message,
+      'publisher_data': publisher_data,
+      'data': message_data,
+    }, "*");
+
+    message_sequence_number++;
+  }
+
+  //
+  // When the img for an ad is loaded into its iframe
+  //
+  function onAdLoaded(source, publisher_data) {
+    // Resize containing iframe to size of image
+    var iframe = document.getElementById("ad-frame");
+    var img = iframe.contentWindow.document.getElementsByTagName("IMG")[0];
+
+    iframe.style.width = img.width + "px";
+    iframe.style.height = img.height + "px";
+
+    // Size of ad = size of document body + margins
+    function sint(value) {

[asargent_no_longer_on_chrome, 2013/03/11 19:10:14]

nits: can you use a more meaningful function name than "sint"? Maybe "sizeAsInt"
or something?

Also, right now you're returning a float - does "int" in the name not imply that
you wanted an integer result? 

I'm guessing you're returning a float here because you don't want to lose
precision with arithmetic? Would it be better to have a function that takes in a
list of property names, and have it look up their values and do the addition? 


E.g. 

function getCombinedSize(style, propertyNames) {
  float result;
  for (var i = 0; i < propertyNames.length; i++) {
    var value = style.getPropertyValue(propertyNames[i]);
    result += parseFloat(value.substr(0, value.indexOf("px")));
  }
  return Math.round(result);
}


(again, not sure if you wanted this to remain a float or round to integer)

[rpaquay, 2013/03/12 19:56:48]

Done.

+      return parseFloat(value.substr(0, value.indexOf("px")));
+    }
+
+    var style = document.defaultView.getComputedStyle(document.body, '');
+    var elemHeight = sint(style.getPropertyValue('height'));
+    var elemVerticalMargin =
+      sint(style.getPropertyValue('margin-top')) +
+      sint(style.getPropertyValue('margin-bottom'));
+
+    var elemWidth = sint(style.getPropertyValue('width'));
+    var elemHorizontalMargin =
+      sint(style.getPropertyValue('margin-left')) +
+      sint(style.getPropertyValue('margin-right'));
+
+    var adRect = {
+      height: (elemHeight + elemVerticalMargin) + "px",
+      width: (elemWidth + elemHorizontalMargin) + "px",
+    };
+
+    sendAppMessage(source, "ad-displayed", publisher_data, {
+      'ad_size': {
+        width: adRect.width,
+        height: adRect.height
+      }});
+
+    img.onclick = function() {
+      sendAppMessage(source, "ad-clicked", publisher_data);
+    };
+  }
+
+  //
+  // display a random ad in the ad iframe
+  //
+  function displayAd(source, publisher_data, ad_index) {
+    // Remove temporary message since we are about to display an add
+    var tempDiv = document.getElementById("temp-display");
+    if (tempDiv) {
+      tempDiv.parentNode.removeChild(tempDiv);
+    }
+
+    // Load image in iframe
+    var iframe = document.getElementById("ad-frame");
+    if (iframe.contentWindow.document.body.firstChild == null) {
+      var img = iframe.contentWindow.document.createElement("img");
+      iframe.contentWindow.document.body.appendChild(img);
+    }
+    var img = iframe.contentWindow.document.body.firstChild;
+    img.onload = function() { onAdLoaded(source, publisher_data); };
+    img.src = getAdUrl(ad_index);
+    iframe.style.visibility = "visible";
+  }
+
+  function processAppMessage(source, data) {
+    if (data.message == "display-ad") {
+      displayAd(source, data.publisher_data);
+    }
+    else if (data.message == "display-first-ad") {
+      displayAd(source, data.publisher_data, 0/*ad_index*/);
+    }
+    else if (data.message == "onloadcommit") {
+      sendAppMessage(source, "onloadcommit-ack");
+    }
+  }
+
+  function onPostMessage(eventMessage) {
+    processAppMessage(eventMessage.source, eventMessage.data);
+  }
+
+  function onDocumentReady() {
+    document.getElementById("url").textContent = window.location;
+  }
+
+  //
+  // Add global event listeners.
+  //
+  window.addEventListener("message", onPostMessage, false);
+  document.addEventListener('DOMContentLoaded', onDocumentReady, false);
+
+})(window);