DevTools: [timeline tree view] Auto update sort columns on view type change.

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 97 matching lines @@
     {
         this._groupBySetting.set(this._groupByCombobox.selectedOption().value);
         this._refreshTree();
     },
 
     _refreshTree: function()
     {
         this.dataGrid.rootNode().removeChildren();
         var topDown = WebInspector.TimelineModel.buildTopDownTree(
             this._model.mainThreadEvents(), this._startTime, this._endTime, this._filters, WebInspector.TimelineTreeView.eventId);
-        var tree = this._modeCombobox.selectedOption().value === WebInspector.TimelineTreeView.Mode.TopDown
-            ? this._preformTopDownTreeGrouping(topDown)
-            : this._buildBottomUpTree(topDown);
+        var isTopDown = this._modeCombobox.selectedOption().value === WebInspector.TimelineTreeView.Mode.TopDown;
+        var tree = isTopDown ? this._preformTopDownTreeGrouping(topDown) : this._buildBottomUpTree(topDown);
+        this.dataGrid.markColumnAsSortedBy(isTopDown ? "total" : "self", WebInspector.DataGrid.Order.Descending);
         var maxSelfTime = 0;
         var maxTotalTime = 0;
         for (var child of tree.children.values()) {
             maxSelfTime = Math.max(maxSelfTime, child.selfTime);
             maxTotalTime = Math.max(maxTotalTime, child.totalTime);
         }
         for (var child of tree.children.values()) {
             // Exclude the idle time off the total calculation.
             var gridNode = new WebInspector.TimelineTreeView.GridNode(child, topDown.totalTime, maxSelfTime, maxTotalTime);
             this.dataGrid.insertChild(gridNode);
@@ skipping 283 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._maxTimes.self, this._maxTimes.total);
             this.insertChildOrdered(gridNode);
         }
     },
 
     __proto__: WebInspector.SortableDataGridNode.prototype
 }