Fix UI glitches on Performance and Memory panels

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

 // Copyright 2016 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.
 
 Timeline.FlameChartStyle = {
   textColor: '#333'
 };
 
 /**
  * @enum {symbol}
@@ skipping 288 matching lines @@
    * @param {!Common.Event} event
    */
   _onEntrySelected(dataProvider, event) {
     var entryIndex = /** @type{number} */ (event.data);
     this._delegate.select(dataProvider.createSelection(entryIndex));
   }
 
   resizeToPreferredHeights() {
     this._splitWidget.setSidebarSize(
         this._networkDataProvider.preferredHeight() + this._splitResizer.clientHeight + PerfUI.FlameChart.HeaderHeight +
-        2);
+        3);
   }
 };
 
 /**
  * @unrestricted
  */
 Timeline.TimelineFlameChartView.Selection = class {
   /**
    * @param {!Timeline.TimelineSelection} selection
    * @param {number} entryIndex
    */
   constructor(selection, entryIndex) {
     this.timelineSelection = selection;
     this.entryIndex = entryIndex;
   }
 };