DevTools: Support keyboard arrows navigation on flame chart

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 600 matching lines @@
      * @param {number} windowStartTime
      * @param {number} windowEndTime
      */
     requestWindowTimes: function(windowStartTime, windowEndTime)
     {
         this._selectRange(windowStartTime, windowEndTime);
     },
 
     /**
      * @override
+     * @param {number} entryIndex
+     */
+    requestSelectionChange: function(entryIndex)
+    {
+    },
+
+    /**
+     * @override
      * @param {number} startTime
      * @param {number} endTime
      */
     updateRangeSelection: function(startTime, endTime)
     {
     },
 
     /**
      * @param {number} timeLeft
      * @param {number} timeRight
@@ skipping 113 matching lines @@
     {
         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";
     },
 
     __proto__: WebInspector.VBox.prototype
 }