Enable the keyboard to show the popup keyboard for inputting accented characters.

chrome/browser/resources/keyboard/layout_us.js

 // Copyright (c) 2011 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.
 
 /**
  * @fileoverview A simple English virtual keyboard implementation.
  */
 
 /**
  * All keys for the rows of the keyboard.
  * NOTE: every row below should have an aspect of 12.6.
  * @type {Array.<Array.<BaseKey>>}
  */
 var KEYS_US = [
   [
     new SvgKey('tab', 'Tab'),
-    new Key(C('q'), C('Q'), C('1'), C('`')),
-    new Key(C('w'), C('W'), C('2'), C('~')),
-    new Key(C('e'), C('E'), C('3'), new Character('<', 'LessThan')),
-    new Key(C('r'), C('R'), C('4'), new Character('>', 'GreaterThan')),
-    new Key(C('t'), C('T'), C('5'), C('[')),
-    new Key(C('y'), C('Y'), C('6'), C(']')),
-    new Key(C('u'), C('U'), C('7'), C('{')),
-    new Key(C('i'), C('I'), C('8'), C('}')),
-    new Key(C('o'), C('O'), C('9'), C('\'')),
-    new Key(C('p'), C('P'), C('0'), C('|')),
+    new Key(CP('q'), CP('Q'), CP('1'), CP('`')),
+    new Key(CP('w'), CP('W'), CP('2'), CP('~')),
+    new Key(CP('e'), CP('E'), CP('3'), CP('<', 'LessThan')),
+    new Key(CP('r'), CP('R'), CP('4'), CP('>', 'GreaterThan')),
+    new Key(CP('t'), CP('T'), CP('5'), CP('[')),
+    new Key(CP('y'), CP('Y'), CP('6'), CP(']')),
+    new Key(CP('u'), CP('U'), CP('7'), CP('{')),
+    new Key(CP('i'), CP('I'), CP('8'), CP('}')),
+    new Key(CP('o'), CP('O'), CP('9'), CP('\'')),
+    new Key(CP('p'), CP('P'), CP('0'), CP('|')),
     new SvgKey('backspace', 'Backspace', true /* repeat */)
   ],
   [
     new SymbolKey(),
-    new Key(C('a'), C('A'), C('!'), C('+')),
-    new Key(C('s'), C('S'), C('@'), C('=')),
-    new Key(C('d'), C('D'), C('#'), C(' ')),
-    new Key(C('f'), C('F'), C('$'), C(' ')),
-    new Key(C('g'), C('G'), C('%'), C(' ')),
-    new Key(C('h'), C('H'), C('^'), C(' ')),
-    new Key(C('j'), C('J'), new Character('&', 'Ampersand'), C(' ')),
-    new Key(C('k'), C('K'), C('*'), C('#')),
-    new Key(C('l'), C('L'), C('('), C(' ')),
-    new Key(C('\''), C('\''), C(')'), C(' ')),
+    new Key(CP('a'), CP('A'), CP('!'), CP('+')),
+    new Key(CP('s'), CP('S'), CP('@'), CP('=')),
+    new Key(CP('d'), CP('D'), CP('#'), CP(' ')),
+    new Key(CP('f'), CP('F'), CP('$'), CP(' ')),
+    new Key(CP('g'), CP('G'), CP('%'), CP(' ')),
+    new Key(CP('h'), CP('H'), CP('^'), CP(' ')),
+    new Key(CP('j'), CP('J'), CP('&', 'Ampersand'), CP(' ')),
+    new Key(CP('k'), CP('K'), CP('*'), CP('#')),
+    new Key(CP('l'), CP('L'), CP('('), CP(' ')),
+    new Key(CP('\''), CP('\''), CP(')'), CP(' ')),
     new SvgKey('return', 'Enter')
   ],
   [
     new ShiftKey('left_shift'),
-    new Key(C('z'), C('Z'), C('/'), C(' ')),
-    new Key(C('x'), C('X'), C('-'), C(' ')),
-    new Key(C('c'), C('C'), C('\''), C(' ')),
-    new Key(C('v'), C('V'), C('"'), C(' ')),
-    new Key(C('b'), C('B'), C(':'), C('.')),
-    new Key(C('n'), C('N'), C(';'), C(' ')),
-    new Key(C('m'), C('M'), C('_'), C(' ')),
-    new Key(C('!'), C('!'), C('{'), C(' ')),
-    new Key(C('?'), C('?'), C('}'), C(' ')),
-    new Key(C('/'), C('/'), C('\\'), C(' ')),
+    new Key(CP('z'), CP('Z'), CP('/'), CP(' ')),
+    new Key(CP('x'), CP('X'), CP('-'), CP(' ')),
+    new Key(CP('c'), CP('C'), CP('\''), CP(' ')),
+    new Key(CP('v'), CP('V'), CP('"'), CP(' ')),
+    new Key(CP('b'), CP('B'), CP(':'), CP('.')),
+    new Key(CP('n'), CP('N'), CP(';'), CP(' ')),
+    new Key(CP('m'), CP('M'), CP('_'), CP(' ')),
+    new Key(CP('!'), CP('!'), CP('{'), CP(' ')),
+    new Key(CP('?'), CP('?'), CP('}'), CP(' ')),
+    new Key(CP('/'), CP('/'), CP('\\'), CP(' ')),
     new ShiftKey()
   ],
   [
     new SvgKey('mic', ''),
     new DotComKey(),
     new SpecialKey('at', '@', '@'),
     // TODO(bryeung): the spacebar needs to be a little bit more stretchy,
     // since this row has only 7 keys (as opposed to 12), the truncation
     // can cause it to not be wide enough.
     new SpecialKey('space', ' ', 'Spacebar'),
     new SpecialKey('comma', ',', ','),
     new SpecialKey('period', '.', '.'),
     new HideKeyboardKey()
   ]
 ];
 
 // Add layout to KEYBOARDS, which is defined in common.js
 KEYBOARDS['us'] = {
   "definition": KEYS_US,
   "aspect": 3.15,
 }