DevTools: Highlight DOM node on hover in flamechart.

third_party/WebKit/Source/devtools/front_end/profiler/CPUProfileFlameChart.js

 /**
  * Copyright (C) 2014 Google Inc. All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions are
  * met:
  *
  *     * Redistributions of source code must retain the above copyright
  * notice, this list of conditions and the following disclaimer.
  *     * Redistributions in binary form must reproduce the above
@@ skipping 97 matching lines @@
    * @param {number} entryIndex
    * @return {?Element}
    */
   prepareHighlightedEntryInfo(entryIndex) {
     throw 'Not implemented.';
   }
 
   /**
    * @override
    * @param {number} entryIndex
+   */
+  highlightEntry(entryIndex) {
+  }
+
+  /**
+   * @override
+   * @param {number} entryIndex
    * @return {boolean}
    */
   canJumpToEntry(entryIndex) {
     return this._entryNodes[entryIndex].scriptId !== '0';
   }
 
   /**
    * @override
    * @param {number} entryIndex
    * @return {string}
@@ skipping 423 matching lines @@
    * @param {number} height
    */
   _resetCanvas(width, height) {
     var ratio = window.devicePixelRatio;
     this._overviewCanvas.width = width * ratio;
     this._overviewCanvas.height = height * ratio;
     this._overviewCanvas.style.width = width + 'px';
     this._overviewCanvas.style.height = height + 'px';
   }
 };