Add a settings screen that lets the user choose how they unlock their device.

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

+// Copyright 2016 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
+ * Contains utilities for verifying the user has entered an account password.
+ */
+
+/** @polymerBehavior */
+var QuickUnlockValidatingBehavior = [QuickUnlockRoutingBehavior, {
+  properties: {
+    setModes: Object
+  },
+
+  /**
+   * Verifies that there is an account password. If there is no password, this
+   * will redirect to the authenticate screen.
+   */
+  checkForPassword: function() {

[tommycli, 2016/06/29 22:56:09]

Maybe rename this to: askForPasswordIfUnset, or something similar, to make clear
that this will trigger an action rather than just verifying the password.

Likewise, perhaps a better name for the behavior is:
PasswordTimeoutRedirectBehavior -- or something similar.

[jdufault, 2016/06/30 18:10:18]

Done, this is a much better name.
Renamed to QuickUnlockPasswordDetectBehavior

+    if (!this.setModes) {
+      this.currentRoute = {
+        page: 'basic',
+        section: 'people',
+        subpage: [QuickUnlockScreen.AUTHENTICATE]
+      };
+    }
+  }
+}];