Support standard keyboard keys emulated by the braille drivers.

chrome/common/extensions/api/braille_display_private.idl

 // Copyright 2013 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.
 
 // Braille display access private API.
 namespace brailleDisplayPrivate {
   // Braille display keyboard command.
   enum KeyCommand {
     line_up,
     line_down,
@@ skipping 10 matching lines @@
   // A keyboard event.  This is not a standard keyboard event because
   // braille display keyboards look significantly different from standard
   // keyboards.
   dictionary KeyEvent {
     KeyCommand command;
     // 0-based display position for commands that involve a routing key.
     long? displayPosition;
     // Braille dot keys that were pressed, stored in the low-order bits.
     // Dot 1 is stored in bit 0, dot2 in bit 1, etc.
     long? brailleDots;
-    // DOM keyboard event for a key that corresponds to a standard key.
-    DOMString? standardKeyName;
+    // DOM keyboard event code.  This is present when command is standard_key
+    // and the braille display event represents a non-alphanumeric key such
+    // as an arrow key or function key.
+    // The value is as defined by the |code| property in
+    // http://www.w3.org/TR/uievents/#keyboard-event-interface
+    DOMString? standardKeyCode;
+    // DOM keyboard event character value.  This is present if the
+    // braille key event corresponds to a character.
+    DOMString? standardKeyChar;
     // Whether the space key was pressed.
     boolean? spaceKey;
     // Whether the alt key was pressed.
     boolean? altKey;
     // Whether the shift key was pressed.
     boolean? shiftKey;
     // Whether the ctrl key was pressed.
     boolean? ctrlKey;
   };
 
@@ skipping 20 matching lines @@
     static void writeDots(ArrayBuffer cells);
   };
 
   interface Events {
     // Fired when a braille display is connected or disconnected.
     static void onDisplayStateChanged(DisplayState state);
     // Fired when an input event is received from the display.
     static void onKeyEvent(KeyEvent event);
   };
 };