DevTools: Move build(TopDown|BottomUp)Tree to TimelineModel

Source/devtools/front_end/timeline/TimelineTreeView.js

 // Copyright 2015 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.
 
 /**
  * @constructor
  * @extends {WebInspector.VBox}
  * @param {!WebInspector.TimelineModel} model
  */
 WebInspector.TimelineTreeView = function(model)
@@ skipping 152 matching lines @@
                 return e.name + ":@" + WebInspector.TimelineTreeView.eventURL(e);
             return e.name;
         }
 
         var groupByMapper = new Map([
             [WebInspector.TimelineTreeView.GroupBy.None, groupByNone],
             [WebInspector.TimelineTreeView.GroupBy.Domain, groupByDomain],
             [WebInspector.TimelineTreeView.GroupBy.DomainSecondLevel, groupByDomainSecondLevel],
             [WebInspector.TimelineTreeView.GroupBy.URL, groupByURL]
         ]);
-        var topDown = WebInspector.TimelineUIUtils.buildTopDownTree(this._model.mainThreadEvents(), this._startTime, this._endTime, this._filters, eventId);
-        var bottomUpRoot = WebInspector.TimelineUIUtils.buildBottomUpTree(topDown, groupByMapper.get(groupBy));
+        var topDown = WebInspector.TimelineModel.buildTopDownTree(this._model.mainThreadEvents(), this._startTime, this._endTime, this._filters, eventId);
+        var bottomUpRoot = WebInspector.TimelineModel.buildBottomUpTree(topDown, groupByMapper.get(groupBy));
         for (var group of groupNodes)
             bottomUpRoot.children.set(group[0], group[1]);
         this.dataGrid.rootNode().removeChildren();
         for (var child of bottomUpRoot.children.values()) {
             // Exclude the idle time off the total calculation.
             var gridNode = new WebInspector.TimelineTreeView.GridNode(child, topDown.totalTime);
             this.dataGrid.insertChild(gridNode);
         }
         this._sortingChanged();
     },
@@ skipping 156 matching lines @@
         if (!this._profileNode.children)
             return;
         for (var node of this._profileNode.children.values()) {
             var gridNode = new WebInspector.TimelineTreeView.GridNode(node, this._totalTime);
             this.insertChildOrdered(gridNode);
         }
     },
 
     __proto__: WebInspector.SortableDataGridNode.prototype
 }