Adding JS and C++ handlers for events on new Welcome page.

chrome/browser/resources/welcome/welcome.js

Index: chrome/browser/resources/welcome/welcome.js
diff --git a/chrome/browser/resources/welcome/welcome.js b/chrome/browser/resources/welcome/welcome.js
index 102537742e9aff3fbbeb2106553d968d56fa75e5..a68333a2817e9fbc36d7bc55a2c2f52cdfb1ee74 100644
--- a/chrome/browser/resources/welcome/welcome.js
+++ b/chrome/browser/resources/welcome/welcome.js
@@ -2,5 +2,25 @@
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
-// TODO(tmartino): Add handlers.
-console.log('JS test');
+cr.define('welcome', function() {
+  'use strict';
+
+  function onAccept(e) {
+    chrome.send('handleActivateSignIn');
+  }
+
+  function onDecline(e) {
+    chrome.send('handleUserDecline');
+  }
+
+  function initialize() {
+    $('accept-button').addEventListener('click', onAccept);
+    $('decline-button').addEventListener('click', onDecline);
+  }
+
+  return {
+    initialize: initialize
+  };
+});
+
+document.addEventListener('DOMContentLoaded', welcome.initialize);