Add a very basic PIN UI implementation that is shared between lock and settings.

chrome/browser/resources/chromeos/compiled_resources.gyp

 # Copyright 2015 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.
 {
   'targets': [
     {
       'target_name': 'bluetooth_pair_device',
       'variables': {
         'depends': [
           '../../../../chrome/browser/resources/options/compiled_resources.gyp:options_bundle',
         ],
         'externs': ['<(EXTERNS_DIR)/chrome_send.js'],
       },
       'includes': ['../../../../third_party/closure_compiler/compile_js.gypi'],
     },
     {
       'target_name': 'certificate_manager_dialog',
       'variables': {
         'depends': [
           '../../../../chrome/browser/resources/options/compiled_resources.gyp:options_bundle',
         ],
         'externs': ['<(EXTERNS_DIR)/chrome_send.js'],
       },
       'includes': ['../../../../third_party/closure_compiler/compile_js.gypi'],
+    },
+    {
+      'target_name': 'quick_unlock/pin_keyboard',
+      'includes': ['../../../../third_party/closure_compiler/compile_js.gypi'],
     }
   ],
 }