Hooking up Android N inline notification replies end-to-end

chrome/test/data/notifications/android_test.html

Index: chrome/test/data/notifications/android_test.html
diff --git a/chrome/test/data/notifications/android_test.html b/chrome/test/data/notifications/android_test.html
index 7d6dfce5eba56a0858556cad37b9f2a6e9bdc34b..073972dfd1f80537c9519257bd3fbd34f3e60528 100644
--- a/chrome/test/data/notifications/android_test.html
+++ b/chrome/test/data/notifications/android_test.html
@@ -11,7 +11,15 @@
     <script>
       function showNotification(title, options) {
         GetActivatedServiceWorker('android_test_worker.js', location.pathname)
-            .then(registration => registration.showNotification(title, options))
+            .then(registration => {
+                messagePort.addEventListener('message', function replyListener(event) {
+                  if (event.data.startsWith('reply: ')) {
+                    messagePort.removeEventListener('message', replyListener);
+                    sendToTest(event.data);
+                  }
+                });
+                return registration.showNotification(title, options);
+            })
             .catch(sendToTest);
       }
 
@@ -30,4 +38,4 @@
       }
     </script>
   </body>
-</html>
+</html>