Implemented scanning by group

chrome/browser/resources/chromeos/switch_access/keyboard_handler.js

 // Copyright 2017 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.
 
 // TODO(elichtenberg): Move into custom logger class or somewhere else.
 let debuggingEnabled = true;
 
 /**
  * Class to handle keyboard input.
  *
@@ skipping 30 matching lines @@
     switch (event.key) {
       case '1':
         console.log('1 = go to next element');
         this.switchAccess_.moveToNode(true);
         break;
       case '2':
         console.log('2 = go to previous element');
         this.switchAccess_.moveToNode(false);
         break;
       case '3':
-        console.log('3 = do default on element');
-        this.switchAccess_.doDefault();
+        console.log('3 = select element');
+        this.switchAccess_.selectCurrentNode();
         break;
       case '4':
         this.switchAccess_.showOptionsPage();
         break;
     }
     if (debuggingEnabled) {
       switch (event.key) {
         case '6':
           console.log('6 = go to next element (debug mode)');
           this.switchAccess_.debugMoveToNext();
           break;
         case '7':
           console.log('7 = go to previous element (debug mode)');
           this.switchAccess_.debugMoveToPrevious();
           break;
         case '8':
           console.log('8 = go to child element (debug mode)');
           this.switchAccess_.debugMoveToFirstChild();
           break;
         case '9':
           console.log('9 = go to parent element (debug mode)');
           this.switchAccess_.debugMoveToParent();
           break;
       }
     }
     this.switchAccess_.performedUserAction();
   }
 };