Fix loading of Browserscope visualization (#188)

Fixes jsperf/jsperf.com#235.
Ref. jsperf/jsperf.com#364.

plugin/ui.browserscope.js

@@ -1007,6 +1007,30 @@
  iframe.frameBorder = 0;
  iframe.scrolling = 'no';
 
+ 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
+ loadScript(
+ 'https://www.google.com/jsapi?autoload=' + encodeURIComponent('{' +
+ 'modules:[{' +
+ 'name:"visualization",' +
+ 'version:1,' +
+ 'packages:["corechart","table"],' +
+ 'callback:ui.browserscope.load' +
+ '}]' +
+ '}'),
+ idoc
+ );
+ });
+
  placeholder.parentNode.replaceChild(iframe, placeholder);
 
  var iwin = frames[name],
@@ -1043,26 +1067,6 @@
 
  // 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
- loadScript('https://www.google.com/jsapi?autoload=' + encodeURIComponent('{' +
- 'modules:[{' +
- 'name:"visualization",' +
- 'version:1,' +
- 'packages:["corechart","table"],' +
- 'callback:ui.browserscope.load' +
- '}]' +
- '}'), idoc);
- }, 1);
  });
 
  // hide the chart while benchmarks are running