DevTools: Support keyboard arrows navigation on flame chart

Source/devtools/front_end/timeline/TimelinePanel.js

 /*
  * Copyright (C) 2012 Google Inc. All rights reserved.
  * Copyright (C) 2012 Intel 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.
@@ skipping 1380 matching lines @@
     {
         this._init();
         this._heavyChart.reset();
         this._dataProvider.setWindowTimes(selection._startTime, selection._endTime);
         this._dataProvider.timelineData();
         this._heavyChart.setWindowTimes(0, this._dataProvider.totalTime());
     },
 
     /**
      * @override
+     * @param {number} entryIndex
+     */
+    requestSelectionChange: function(entryIndex)
+    {
+    },
+
+    /**
+     * @override
      * @param {number} startTime
      * @param {number} endTime
      */
     requestWindowTimes: function(startTime, endTime)
     {
         this._heavyChart.setWindowTimes(startTime, endTime);
     },
 
     /**
      * @override
@@ skipping 366 matching lines @@
      * @override
      * @param {string} value
      */
     handleQueryParam: function(value)
     {
         WebInspector.TimelinePanel.show();
         WebInspector.TimelinePanel.instance()._loadFromURL(value);
     }
 }