Lock screen pin keyboard ui upgrades.

chrome/browser/resources/chromeos/quick_unlock/pin_keyboard.js

Index: chrome/browser/resources/chromeos/quick_unlock/pin_keyboard.js
diff --git a/chrome/browser/resources/chromeos/quick_unlock/pin_keyboard.js b/chrome/browser/resources/chromeos/quick_unlock/pin_keyboard.js
index 9b9ba5dad8b5dc2ba8c528ddea38566061751d5e..4bc2ea12851a5089d706a4c5de787754497a4cc1 100644
--- a/chrome/browser/resources/chromeos/quick_unlock/pin_keyboard.js
+++ b/chrome/browser/resources/chromeos/quick_unlock/pin_keyboard.js
@@ -47,6 +47,14 @@ Polymer({
       value: false
     },
 
+    /**
+     * Whether or not the keyboard's input has anything entered.
+     */
+    hasContent: {

[jdufault, 2016/08/26 01:24:12]

It doesn't look like this property ever gets updated. Either way, use a function
instead of a property so you can declare the dependency inside of the html.

Can you also apply this treatment to all of the other functions which follow the
pattern

  function foo(a) {
    return a ? 'class' : '';
  }

[sammiequon, 2016/08/26 19:56:38]

Done.

+      type: Boolean,
+      value: false
+    },
+
     /** The value stored in the keyboard's input element. */
     value: {
       type: String,
@@ -127,12 +135,12 @@ Polymer({
   },
 
   /**
-   * Changes the color of the submit button if PIN is ready.
+   * Disables the submit and backspace button if nothing is entered.
    * @param {string} value
    * @private
    */
-  getSubmitClass_: function(value) {
-    return value.length > 0 ? 'ready-background' : '';
+  hasInput_: function(value) {
+    return value.length > 0;
   },
 
   /**
@@ -178,7 +186,7 @@ Polymer({
    * @param {boolean} submitEnabled
    * @private
    */
-  getSubmitHiddenClass_: function(submitEnabled) {
+  getSubmitClass_: function(submitEnabled) {
     return submitEnabled ? '' : 'submit-button-hidden';
   }
 });