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

Index: chrome/test/data/webui/settings/fake_quick_unlock_private.js
diff --git a/chrome/test/data/webui/settings/fake_quick_unlock_private.js b/chrome/test/data/webui/settings/fake_quick_unlock_private.js
index 0852d671316e1ef2bc85220a1aa7ffecc252cc46..e0e43d4a68ba274b615a7503c6f9c31a645cba1d 100644
--- a/chrome/test/data/webui/settings/fake_quick_unlock_private.js
+++ b/chrome/test/data/webui/settings/fake_quick_unlock_private.js
@@ -5,6 +5,13 @@
 /**
  * @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.
@@ -54,7 +61,47 @@ cr.define('settings', function() {
       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 = [];
+
+      // For testing we will use a min length of 4.
+      if (!!credential && credential.length < 4)
+        errors.push(chrome.quickUnlockPrivate.CredentialProblem.TOO_SHORT);
+
+      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) {
+      var fakeCredentials = {};
+
+      // For testing we will use a min length of 4 and a max length of 0 (no max
+      // length).
+      fakeCredentials.minLength = 4;
+      fakeCredentials.maxLength = 0;
+      onComplete(fakeCredentials);
+    },
   };
 
   /** @type {!ChromeEvent} */