DevTools: Make sure network and main flamechart scales are in sync.

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.
 
 /**
  * @implements {UI.FlameChartDataProvider}
  * @unrestricted
  */
 Timeline.TimelineFlameChartDataProviderBase = class {
   constructor() {
@@ skipping 280 matching lines @@
     super();
     this.element.classList.add('timeline-flamechart');
     this._delegate = delegate;
     this._model = timelineModel;
     this._extensionModels = extensionModels;
     this._splitWidget = new UI.SplitWidget(false, false, 'timelineFlamechartMainView', 150);
 
     this._dataProvider = new Timeline.TimelineFlameChartDataProvider(this._model, frameModel, irModel, filters);
     var mainViewGroupExpansionSetting = Common.settings.createSetting('timelineFlamechartMainViewGroupExpansion', {});
     this._mainView = new UI.FlameChart(this._dataProvider, this, mainViewGroupExpansionSetting);
+    this._mainView.alwaysShowVerticalScroll();
 
     var networkViewGroupExpansionSetting =
         Common.settings.createSetting('timelineFlamechartNetworkViewGroupExpansion', {});
     this._networkDataProvider = new Timeline.TimelineFlameChartNetworkDataProvider(this._model);
     this._networkView = new UI.FlameChart(this._networkDataProvider, this, networkViewGroupExpansionSetting);
+    this._networkView.alwaysShowVerticalScroll();
     networkViewGroupExpansionSetting.addChangeListener(this.resizeToPreferredHeights.bind(this));
 
     this._splitWidget.setMainWidget(this._mainView);
     this._splitWidget.setSidebarWidget(this._networkView);
     this._splitWidget.show(this.element);
 
     this._onMainEntrySelected = this._onEntrySelected.bind(this, this._dataProvider);
     this._onNetworkEntrySelected = this._onEntrySelected.bind(this, this._networkDataProvider);
     this._mainView.addEventListener(UI.FlameChart.Events.EntrySelected, this._onMainEntrySelected, this);
     this._networkView.addEventListener(UI.FlameChart.Events.EntrySelected, this._onNetworkEntrySelected, this);
@@ skipping 158 matching lines @@
 Timeline.TimelineFlameChartView.Selection = class {
   /**
    * @param {!Timeline.TimelineSelection} selection
    * @param {number} entryIndex
    */
   constructor(selection, entryIndex) {
     this.timelineSelection = selection;
     this.entryIndex = entryIndex;
   }
 };