[Devtools] Added typing to network in prep for removing unrestricted

third_party/WebKit/Source/devtools/front_end/network/NetworkOverview.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.
 /**
  * @unrestricted
  */
 Network.NetworkOverview = class extends PerfUI.TimelineOverviewBase {
   constructor() {
     super();
+    this._selectedFilmStripTime = -1;
     this.element.classList.add('network-overview');
 
     /** @type {number} */
     this._numBands = 1;
     /** @type {boolean} */
     this._updateScheduled = false;
 
     SDK.targetManager.addModelListener(
         SDK.ResourceTreeModel, SDK.ResourceTreeModel.Events.Load, this._loadEventFired, this);
     SDK.targetManager.addModelListener(
@@ skipping 249 matching lines @@
     }
     context.restore();
   }
 };
 
 /** @type {number} */
 Network.NetworkOverview._bandHeight = 3;
 
 /** @typedef {{start: number, end: number}} */
 Network.NetworkOverview.Window;