Js fixed for proper status setting on HID screen.

chrome/browser/resources/chromeos/login/oobe_screen_hid_detection.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 Oobe HID detection screen implementation.
  */
 
 login.createScreen('HIDDetectionScreen', 'hid-detection', function() {
   var CONTEXT_KEY_KEYBOARD_STATE = 'keyboard-state';
@@ skipping 151 matching lines @@
      * Sets a device-block css class to reflect device state of searching,
      * connected, pairing or paired (for BT devices).
      * @param {blockId} id one of keys of this.BLOCK dict.
      * @param {state} one of keys of this.CONNECTION dict.
      * @private
      */
     setDeviceBlockState_: function(blockId, state) {
       if (state == 'update')
         return;
       var deviceBlock = $(blockId);
-      for (var stateCase in this.CONNECTION)
+      for (var key in this.CONNECTION) {
+        var stateCase = this.CONNECTION[key];
         deviceBlock.classList.toggle(stateCase, stateCase == state);
+      }
 
       // 'Continue' button available iff at least one device is connected,
-      if ((blockId in this.BLOCK) &&
-          (state == this.CONNECTION.CONNECTED ||
-           state == this.CONNECTION.PAIRED)) {
+      var keyboardState = this.context.get(CONTEXT_KEY_KEYBOARD_STATE, '');

[Nikita (slow), 2015/02/26 12:10:08]

As discussed, please move this login to C++ side.

+      var mouseState = this.context.get(CONTEXT_KEY_MOUSE_STATE, '');
+      if (keyboardState == this.CONNECTION.CONNECTED ||
+          keyboardState == this.CONNECTION.PAIRED ||
+          mouseState == this.CONNECTION.CONNECTED ||
+          mouseState == this.CONNECTION.PAIRED) {
         $('hid-continue-button').disabled = false;
       } else {
         $('hid-continue-button').disabled = true;
       }
     },
 
     /**
      * Sets state for mouse-block.
      * @param {state} one of keys of this.CONNECTION dict.
      */
@@ skipping 25 matching lines @@
      * Event handler that is invoked just before the screen in shown.
      * @param {Object} data Screen init payload.
      */
     onBeforeShow: function(data) {
       this.setDeviceBlockState_('hid-mouse-block', this.CONNECTION.SEARCHING);
       this.setDeviceBlockState_('hid-keyboard-block',
                                 this.CONNECTION.SEARCHING);
     },
   };
 });