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

BUG=463547

Review URL: https://codereview.chromium.org/1295403002

git-svn-id: svn://svn.chromium.org/blink/trunk@200782 bbb929c8-8fbe-4397-9dbb-9b2b20218538

third_party/WebKit/Source/devtools/front_end/timeline/TimelineTreeView.js

@@ -115,9 +115,9 @@ WebInspector.TimelineTreeView.prototype = {
         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()) {