md-settings: Added settings for fingerprint unlock.

chrome/browser/resources/settings/people_page/people_page.js

 // 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.
 
 /**
  * @fileoverview
  * 'settings-people-page' is the settings page containing sign-in settings.
  */
 Polymer({
   is: 'settings-people-page',
@@ skipping 59 matching lines @@
      * @private
      */
     quickUnlockEnabled_: {
       type: Boolean,
       value: function() {
         return loadTimeData.getBoolean('pinUnlockEnabled');
       },
       readOnly: true,
     },
 
+    fingerprintUnlockEnabled_: {

[jdufault, 2016/12/01 17:11:20]

I think it makes a little bit more sense to handle this inside of lock_screen;
people_page doesn't have any logic that needs this value.

It may be nice to be able to externally control if fingerprint is
enabled/disabled for testing though, but that can be added back pretty easily if
needed.

quickUnlockEnabled_ is defined here because it changes the structure of people
page (it adds or removes a settings-subpage).

[sammiequon, 2016/12/01 20:52:29]

Done.

+      type: Boolean,
+      value: function() {
+        return loadTimeData.getBoolean('fingerprintUnlockEnabled');
+      },
+      readOnly: true,
+    },
+
     /** @private {!settings.EasyUnlockBrowserProxy} */
     easyUnlockBrowserProxy_: {
       type: Object,
       value: function() {
         return settings.EasyUnlockBrowserProxyImpl.getInstance();
       },
     },
 
     /**
      * True if Easy Unlock is allowed on this machine.
@@ skipping 360 matching lines @@
 
   /**
    * @param {!settings.SyncStatus} syncStatus
    * @return {boolean} Whether to show the "Sign in to Chrome" button.
    * @private
    */
   showSignin_: function(syncStatus) {
     return !!syncStatus.signinAllowed && !syncStatus.signedIn;
   },
 });