Submit button added to user pod.

ui/login/account_picker/user_pod_row.js

Index: ui/login/account_picker/user_pod_row.js
diff --git a/ui/login/account_picker/user_pod_row.js b/ui/login/account_picker/user_pod_row.js
index dfb2b3ad0cbaf2df2e64bc0bd1ddeec38b5d9d37..1c7bec0c0ac08e8e2280b45f3bfb1e370c9f9c62 100644
--- a/ui/login/account_picker/user_pod_row.js
+++ b/ui/login/account_picker/user_pod_row.js
@@ -755,6 +755,10 @@ cr.define('login', function() {
           this.parentNode.handleKeyDown.bind(this.parentNode));
       this.passwordElement.addEventListener('keypress',
           this.handlePasswordKeyPress_.bind(this));
+      this.passwordElement.addEventListener('input',
+          this.handlePasswordInput_.bind(this));
+      this.submitButton.addEventListener('click',
+          this.handleSubmitButtonClick_.bind(this));
 
       this.imageElement.addEventListener('load',
           this.parentNode.handlePodImageLoad.bind(this.parentNode, this));
@@ -791,6 +795,24 @@ cr.define('login', function() {
     },
 
     /**
+     * Handles input changes on password input.
+     * @param {Event} e Input Event object.
+     * @private
+     */
+    handlePasswordInput_: function(e) {
+      this.submitButton.disabled = this.passwordElement.value.length <= 0;
+      this.setErrorDisplay(false);
+    },
+
+    /**
+     * Handles a click event on submit button.
+     * @param {Event} e Click event.
+     */
+    handleSubmitButtonClick_: function(e) {
+      this.parentNode.setActivatedPod(this, e);
+    },
+
+    /**
      * Top edge margin number of pixels.
      * @type {?number}
      */
@@ -868,6 +890,14 @@ cr.define('login', function() {
     },
 
     /**
+     * Gets submit button.
+     * @type {!HTMLInputElement}
+     */
+    get submitButton() {
+      return this.querySelector('.submit-button');
+    },
+
+    /**
      * Gets the password label, which is used to show a message where the
      * password field is normally.
      * @type {!HTMLInputElement}
@@ -1093,6 +1123,10 @@ cr.define('login', function() {
       }
     },
 
+    setErrorDisplay: function(visible) {
+      this.submitButton.classList.toggle('error-shown', visible);
+    },
+
     toggleTransitions: function(enable) {
       this.classList.toggle('flying-pin-pod', enable);
     },
@@ -2542,11 +2576,28 @@ cr.define('login', function() {
       userPod.initialize();
     },
 
+    /**
+     * Performs visual changes on the user pod if there is an error.
+     * @param {boolean} visible Whether to show or hide the display.
+     */
+    setFocusedPodErrorDisplay: function(visible) {
+      if (this.focusedPod_)
+        this.focusedPod_.setErrorDisplay(visible);
+    },
+
+    /**
+     * Enables or disables transitions on the user pod.
+     * @param {boolean} enable
+     */
     togglePinTransitions: function(enable) {
       for (var i = 0; i < this.pods.length; ++i)
         this.pods[i].toggleTransitions(enable);
     },
 
+    /**
+     * Shows or hides the pin keyboard.
+     * @param {boolean} visible
+     */
     setFocusedPodPinVisibility: function(visible) {
       if (this.focusedPod_ && this.focusedPod_.user.showPin)
         this.focusedPod_.setPinVisibility(visible);