Timeline: streamline flame chart views update logic

third_party/WebKit/Source/devtools/front_end/timeline/TimelineNetworkFlameChart.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 {PerfUI.FlameChartDataProvider}
  * @unrestricted
  */
 Timeline.TimelineFlameChartNetworkDataProvider = class {
   constructor() {
     this._font = '11px ' + Host.fontFamily();
-    /** @type {?TimelineModel.TimelineModel} */
-    this._model = null;
-    this.reset();
+    this.setModel(null);
     this._style = {
       padding: 4,
       height: 17,
       collapsible: true,
       color: UI.themeSupport.patchColor('#222', UI.ThemeSupport.ColorUsage.Foreground),
       font: this._font,
       backgroundColor: UI.themeSupport.patchColor('white', UI.ThemeSupport.ColorUsage.Background),
       nestingLevel: 0,
       useFirstLineForOverview: false,
       useDecoratorsForOverview: true,
       shareHeaderLine: false
     };
     this._group = {startLevel: 0, name: Common.UIString('Network'), expanded: false, style: this._style};
   }
 
   /**
    * @param {?Timeline.PerformanceModel} performanceModel
    */
   setModel(performanceModel) {
     this._model = performanceModel && performanceModel.timelineModel();
+    this._maxLevel = 0;
+    this._timelineData = null;
+    /** @type {!Array<!TimelineModel.TimelineModel.NetworkRequest>} */
+    this._requests = [];
   }
 
   /**
    * @return {boolean}
    */
   isEmpty() {
     this.timelineData();
     return !this._requests.length;
   }
 
@@ skipping 29 matching lines @@
   }
 
   /**
    * @override
    * @return {number}
    */
   totalTime() {
     return this._timeSpan;
   }
 
-  reset() {
-    this._maxLevel = 0;
-    this._timelineData = null;
-    /** @type {!Array<!TimelineModel.TimelineModel.NetworkRequest>} */
-    this._requests = [];
-  }
-
   /**
    * @param {number} startTime
    * @param {number} endTime
    */
   setWindowTimes(startTime, endTime) {
     this._startTime = startTime;
     this._endTime = endTime;
     this._updateTimelineData();
   }
 
@@ skipping 290 matching lines @@
 
   /**
    * @override
    * @param {number} entryIndex
    * @return {boolean}
    */
   canJumpToEntry(entryIndex) {
     return false;
   }
 };