cros: Tweaked the good/bad pin checking on the js to use the new quick unlock api function.

chrome/test/data/webui/settings/fake_quick_unlock_private.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 Fake implementation of chrome.quickUnlockPrivate for testing.
  */
+
+/**
+ * A couple weak pins to use for testing.
+ * @const
+ */
+var TEST_WEAK_PINS = ['1111', '1234', '1313', '2001', '1010'];
+
 cr.define('settings', function() {
   /**
    * Fake of the chrome.quickUnlockPrivate API.
    * @constructor
    * @implements {QuickUnlockPrivate}
    */
   function FakeQuickUnlockPrivate() {
     /** @type {!Array<!chrome.quickUnlockPrivate.QuickUnlockMode>} */
         this.availableModes = [chrome.quickUnlockPrivate.QuickUnlockMode.PIN];
     /** @type {!Array<!chrome.quickUnlockPrivate.QuickUnlockMode>} */
         this.activeModes = [];
     /** @type {!Array<string>} */ this.credentials = [];
     /** @type {string} */ this.accountPassword = '';
+    /** @type {!chrome.quickUnlockPrivate.CredentialRequirements} */
+        this.credentialRequirements = {minLength: 4, maxLength: 0};
   }
 
   FakeQuickUnlockPrivate.prototype = {
     // Public testing methods.
     /**
      * @override
      * @param {function(
      *     !Array<!chrome.quickUnlockPrivate.QuickUnlockMode>):void} onComplete
      */
     getAvailableModes: function(onComplete) {
@@ skipping 16 matching lines @@
      * @param {!Array<string>} credentials
      * @param {function(boolean):void} onComplete
      */
     setModes: function(accountPassword, modes, credentials, onComplete) {
       // Even if the account password is wrong we still update activeModes and
       // credentials so that the mock owner has a chance to see what was given
       // to the API.
       this.activeModes = modes;
       this.credentials = credentials;
       onComplete(this.accountPassword == accountPassword);
-    }
+    },
+
+    /**
+     * @override
+     * @param {!chrome.quickUnlockPrivate.QuickUnlockMode} mode
+     * @param {string} credential
+     * @param {function(
+     *     !chrome.quickUnlockPrivate.CredentialCheck):void} onComplete
+     */
+    checkCredential: function(mode, credential, onComplete) {
+      var message = {};
+      var errors = [];
+      var warnings = [];
+
+      if (!!credential &&
+          credential.length < this.credentialRequirements.minLength) {
+        errors.push(chrome.quickUnlockPrivate.CredentialProblem.TOO_SHORT);
+      }
+
+      if (!!credential && this.credentialRequirements.maxLength != 0 &&
+          credential.length > this.credentialRequirements.maxLength) {
+        errors.push(chrome.quickUnlockPrivate.CredentialProblem.TOO_LONG);
+      }
+
+      if (!!credential && TEST_WEAK_PINS.includes(credential))
+        warnings.push(chrome.quickUnlockPrivate.CredentialProblem.TOO_WEAK);
+
+      message.errors = errors;
+      message.warnings = warnings;
+      onComplete(message);
+    },
+
+    /**
+     * @override.
+     * @param {!chrome.quickUnlockPrivate.QuickUnlockMode} mode
+     * @param {function(
+     *     !chrome.quickUnlockPrivate.CredentialRequirements):void onComplete
+     */
+    getCredentialRequirements: function(mode, onComplete) {
+      onComplete(this.credentialRequirements);
+    },
   };
 
   /** @type {!ChromeEvent} */
   FakeQuickUnlockPrivate.prototype.onActiveModesChanged = new FakeChromeEvent();
 
   return {FakeQuickUnlockPrivate: FakeQuickUnlockPrivate};
 });