Add DeviceDisablingManager to manage device disabling

ui/login/display_manager.js

 // Copyright 2014 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 Display manager for WebUI OOBE and login.
  */
 
 // TODO(xiyuan): Find a better to share those constants.
 /** @const */ var SCREEN_OOBE_NETWORK = 'connect';
@@ skipping 308 matching lines @@
     showVersion: function(show) {
       $('version-labels').hidden = !show;
       this.allowToggleVersion_ = !show;
     },
 
     /**
      * Handle accelerators.
      * @param {string} name Accelerator name.
      */
     handleAccelerator: function(name) {
+      if (this.currentScreen.ignoreAccelerators) {
+        return;
+      }
       var currentStepId = this.screens_[this.currentStep_];
       if (name == ACCELERATOR_CANCEL) {
         if (this.currentScreen.cancel) {
           this.currentScreen.cancel();
         }
       } else if (name == ACCELERATOR_ENROLLMENT) {
         if (currentStepId == SCREEN_GAIA_SIGNIN ||
             currentStepId == SCREEN_ACCOUNT_PICKER) {
           chrome.send('toggleEnrollmentScreen');
         } else if (currentStepId == SCREEN_OOBE_NETWORK ||
@@ skipping 699 matching lines @@
    */
   DisplayManager.refocusCurrentPod = function() {
     $('pod-row').refocusCurrentPod();
   };
 
   // Export
   return {
     DisplayManager: DisplayManager
   };
 });