[Media Router] First Run Flow WebUI and strings.

chrome/test/data/webui/media_router/media_router_container_tests.js

Index: chrome/test/data/webui/media_router/media_router_container_tests.js
diff --git a/chrome/test/data/webui/media_router/media_router_container_tests.js b/chrome/test/data/webui/media_router/media_router_container_tests.js
index 88571b6a2a460b74a5951d03cab00c0907679b57..7fc1da1f1dc6c678d36e7be9ec458870c0ad3398 100644
--- a/chrome/test/data/webui/media_router/media_router_container_tests.js
+++ b/chrome/test/data/webui/media_router/media_router_container_tests.js
@@ -162,6 +162,20 @@ cr.define('media_router_container', function() {
         setTimeout(done);
       });
 
+      // Tests for 'acknowledge-first-run-flow' event firing when the
+      // 'first-run-button' button is clicked.
+      test('first run button click', function(done) {
+        container.showFirstRunFlow_ = true;
+
+        setTimeout(function() {
+          container.addEventListener('acknowledge-first-run-flow', function() {
+            done();
+          });
+          MockInteractions.tap(container.shadowRoot.getElementById(
+              'first-run-button'));
+        });
+      });
+
       // Tests for 'create-route' event firing when a sink with no associated
       // route is clicked.
       test('select sink without a route', function(done) {