Timeline: add trace event to style/category mapping to TracingTimelineUIUtils

Source/devtools/front_end/timeline/TracingTimelineModel.js

 // Copyright 2014 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 /**
  * @param {!WebInspector.TracingModel} tracingModel
  * @constructor
  */
 WebInspector.TracingTimelineModel = function(tracingModel)
 {
     this._tracingModel = tracingModel;
     this._mainThreadEvents = [];
 }
 
 WebInspector.TracingTimelineModel.RecordType = {
     Program: "Program",
     EventDispatch: "EventDispatch",
 
     GPUTask: "GPUTask",
 
     RequestMainThreadFrame: "RequestMainThreadFrame",
     BeginFrame: "BeginFrame",
     BeginMainThreadFrame: "BeginMainThreadFrame",
     ActivateLayerTree: "ActivateLayerTree",
     DrawFrame: "DrawFrame",
     ScheduleStyleRecalculation: "ScheduleStyleRecalculation",
     RecalculateStyles: "RecalculateStyles",
     InvalidateLayout: "InvalidateLayout",
     Layout: "Layout",
-    UpdateLayerTree: "UpdateLayerTree",
     PaintSetup: "PaintSetup",
     Paint: "Paint",
     PaintImage: "PaintImage",
     Rasterize: "Rasterize",
     RasterTask: "RasterTask",
     ScrollLayer: "ScrollLayer",
     CompositeLayers: "CompositeLayers",
 
     ParseHTML: "ParseHTML",
 
@@ skipping 265 matching lines @@
     {
         for (var i = this._eventStack.length - 1; i >= 0; --i) {
             var event = this._eventStack[i];
             if (event.name === name)
                 return event;
         }
         return null;
     }
 }