Fix history handling for workspaces, issue with M36

experimental/webtry/res/js/webtry.js

 /**
  * Common JS that talks XHR back to the server and runs the code and receives
  * the results.
  */
 
 
 /**
  * All the functionality is wrapped up in this anonymous closure, but we need
  * to be told if we are on the workspace page or a normal try page, so the
  * workspaceName is passed into the closure, it must be set in the global
  * namespace. If workspaceName is the empty string then we know we aren't
  * running on a workspace page.
  *
- * If we are on a workspace page we also look for a 'history'
+ * If we are on a workspace page we also look for a 'history_'
  * variable in the global namespace which contains the list of tries
  * that are included in this workspace. That variable is used to
  * populate the history list.
  */
 (function() {
     function onLoad() {
       var run             = document.getElementById('run');
       var permalink       = document.getElementById('permalink');
       var embed           = document.getElementById('embed');
       var embedButton     = document.getElementById('embedButton');
@@ skipping 254 matching lines @@
 
       function onEmbedClick() {
         embed.style.display='inline';
       }
 
       if (embedButton) {
         embedButton.addEventListener('click', onEmbedClick);
       }
 
       // Add the images to the history if we are on a workspace page.
-      if (tryHistory && history) {
-        for (var i=0; i<history.length; i++) {
-          addToHistory(history[i].hash, '/i/'+history[i].hash+'.png');
+      if (tryHistory && history_) {
+        for (var i=0; i<history_.length; i++) {
+          addToHistory(history_[i].hash, '/i/'+history_[i].hash+'.png');
         }
       }
     }
 
     // If loaded via HTML Imports then DOMContentLoaded will be long done.
     if (document.readyState != "loading") {
       onLoad();
     } else {
-      this.addEventListener('DOMContentLoaded', onLoad);
+      this.addEventListener('load', onLoad);
     }
 
 })();