DevTools: Support keyboard arrows navigation on flame chart

Source/devtools/front_end/timeline/TimelineFlameChart.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 1422 matching lines @@
      * @param {number} windowStartTime
      * @param {number} windowEndTime
      */
     requestWindowTimes: function(windowStartTime, windowEndTime)
     {
         this._delegate.requestWindowTimes(windowStartTime, windowEndTime);
     },
 
     /**
      * @override
+     * @param {number} entryIndex
+     */
+    requestSelectionChange: function(entryIndex)
+    {
+        this._delegate.select(this._dataProvider.createSelection(entryIndex));
+    },
+
+    /**
+     * @override
      * @param {number} startTime
      * @param {number} endTime
      */
     updateRangeSelection: function(startTime, endTime)
     {
         this._delegate.select(WebInspector.TimelineSelection.fromRange(startTime, endTime));
     },
 
     /**
      * @override
@@ skipping 129 matching lines @@
 /**
   * @constructor
   * @param {!WebInspector.TimelineSelection} selection
   * @param {number} entryIndex
   */
 WebInspector.TimelineFlameChartView.Selection = function(selection, entryIndex)
 {
     this.timelineSelection = selection;
     this.entryIndex = entryIndex;
 }