| Index: tracing/tracing/ui/tracks/thread_track.html | 
| diff --git a/tracing/tracing/ui/tracks/thread_track.html b/tracing/tracing/ui/tracks/thread_track.html | 
| index b5c172c3b99815bf4397d40b95822fd1d62bac8f..ece278cee1af27fe5ef97829669744c94cac29bf 100644 | 
| --- a/tracing/tracing/ui/tracks/thread_track.html | 
| +++ b/tracing/tracing/ui/tracks/thread_track.html | 
| @@ -32,7 +32,7 @@ tr.exportTo('tr.ui.tracks', function() { | 
|  | 
| decorate: function(viewport) { | 
| tr.ui.tracks.ContainerTrack.prototype.decorate.call(this, viewport); | 
| -      this.classList.add('thread-track'); | 
| +      Polymer.dom(this).classList.add('thread-track'); | 
| }, | 
|  | 
| get thread() { | 
|  |