Fix loading of Browserscope visualization

Fixes jsperf#235. Closes jsperf#364.

Author: danez

public/_js/test.js

@@ -22693,6 +22693,27 @@
     var name = 'bs-chart-frame',
         iframe = createElement('iframe', name);
 
+    addListener(iframe, 'load', function () { 
+        // the element the charts are inserted into
+        me.container = query('#bs-chart', idoc)[0];
+
+        if (!me.container) return;
+
+        // Browserscope's UA div is inserted before an element with the id of "bs-ua-script"
+        loadScript('https://www.browserscope.org/ua?o=js', me.container).id = 'bs-ua-script';
+
+        // the "autoload" string is created following the guide at
+        // https://developers.google.com/loader/?hl=en#auto-loading
+        setTimeout(function() { loadScript('https://www.google.com/jsapi?autoload=' + encodeURIComponent('{' +
+          'modules:[{' +
+            'name:"visualization",' +
+            'version:1,' +
+            'packages:["corechart","table"],' +
+            'callback:ui.browserscope.load' +
+          '}]' +
+        '}'), idoc); }, 2000);
+    });
+
     iframe.id = name;
     iframe.frameBorder = 0;
     iframe.scrolling = 'no';
@@ -22733,26 +22754,6 @@
 
     // the frame window of the charts
     me.chartWindow = iwin;
-
-    // ensure that content in iframe is processed by executing on next tick
-    setTimeout(function() {
-      // the element the charts are inserted into
-      me.container = query('#bs-chart', idoc)[0];
-
-      // Browserscope's UA div is inserted before an element with the id of "bs-ua-script"
-      loadScript('https://www.browserscope.org/ua?o=js', me.container).id = 'bs-ua-script';
-
-      // the "autoload" string is created following the guide at
-      // https://developers.google.com/loader/?hl=en#auto-loading
-      setTimeout(function() { loadScript('https://www.google.com/jsapi?autoload=' + encodeURIComponent('{' +
-        'modules:[{' +
-          'name:"visualization",' +
-          'version:1,' +
-          'packages:["corechart","table"],' +
-          'callback:ui.browserscope.load' +
-        '}]' +
-      '}'), idoc); }, 2000);
-    }, 1);
   });
 
   // hide the chart while benchmarks are running