DevTools: Highlight DOM node on hover in flamechart.

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() {
@@ skipping 277 matching lines @@
       var div = contents.createChild('span');
       div.textContent =
           NetworkConditions.uiLabelForPriority(/** @type {!Protocol.Network.ResourcePriority} */ (request.priority));
       div.style.color = this._colorForPriority(request.priority) || 'black';
     }
     contents.createChild('span').textContent = request.url.trimMiddle(maxURLChars);
     return element;
   }
 
   /**
+   * @override
+   * @param {number} entryIndex
+   */
+  highlightEntry(entryIndex) {
+  }
+
+  /**
    * @param {string} priority
    * @return {?string}
    */
   _colorForPriority(priority) {
     if (!this._priorityToValue) {
       var priorities = Protocol.Network.ResourcePriority;
       this._priorityToValue = new Map([
         [priorities.VeryLow, 1], [priorities.Low, 2], [priorities.Medium, 3], [priorities.High, 4],
         [priorities.VeryHigh, 5]
       ]);
@@ skipping 78 matching lines @@
 
   /**
    * @override
    * @param {number} entryIndex
    * @return {boolean}
    */
   canJumpToEntry(entryIndex) {
     return false;
   }
 };