Push API: test that default notification is shown on Android when needed.

chrome/test/data/push_messaging/push_messaging_test_android.html

Index: chrome/test/data/push_messaging/push_messaging_test_android.html
diff --git a/chrome/test/data/push_messaging/push_messaging_test_android.html b/chrome/test/data/push_messaging/push_messaging_test_android.html
index 158c27191a411966b72c2d8f8bb62d29a6eaf75c..ae79ff5ee1ba8ad3ae17af29a1b97ae74e8225fb 100644
--- a/chrome/test/data/push_messaging/push_messaging_test_android.html
+++ b/chrome/test/data/push_messaging/push_messaging_test_android.html
@@ -12,17 +12,56 @@
       // PushMessagingTest observes changes to the tab title as an asynchronous
       // response mechanism from JavaScript to Java.
       // TODO(mvanouwerkerk): Use DomAutomationController - crbug.com/562487
-      function respondToTest(result) {
-        document.title = result;
+      var errorCounter = 0;
+      function sendToTest(message) {
+        // Duplicate messages cannot be detected by the test, don't send them.
+        if (message == document.title) {
+          console.log('Duplicate message: ' + message);
+          message =
+              'Error ' + errorCounter + ' - duplicate message: ' + message;
+          errorCounter++;
+        }
+        document.title = message;
       }
 
+      // Installs a service worker, subscribes to push, and sets up a messaging
+      // mechanism between this page and the service worker. Called by the test.
       function subscribePush() {
         GetActivatedServiceWorker(
             'push_messaging_test_worker_android.js', location.pathname)
-          .then(registration =>
-                  registration.pushManager.subscribe({ userVisibleOnly: true }))
-          .then(subscription => respondToTest('subscribe ok'))
-          .catch(error => respondToTest('subscribe fail: ' + error));
+            .then(registration =>
+              registration.pushManager.subscribe({ userVisibleOnly: true }))
+            .then(subscription => {
+              setupMessageHandler();
+              sendToTest('subscribe ok');
+            })
+            .catch(error => sendToTest('subscribe fail: ' + error));
+      }
+
+      // Sets whether the service worker should show a notification when it
+      // receives a push message or not. Called by the test.
+      function setNotifyOnPush(notify) {
+        sendToServiceWorker('setNotifyOnPush', notify);
+      }
+
+      // Sends a message of type |type| with a data payload of |data| to the
+      // service worker.
+      function sendToServiceWorker(type, data) {
+        navigator.serviceWorker.ready
+            .then(registration => {
+              registration.active.postMessage(
+                  JSON.stringify({'type': type, 'data': data}));
+            });
+      }
+
+      // The data for messages of type sendToTest will be passed to the test.
+      function setupMessageHandler() {
+        messagePort.addEventListener('message', event => {
+          var message = JSON.parse(event.data);
+          if (message.type == 'sendToTest') {
+            sendToTest(message.data);
+          }
+        });
       }
     </script>
   </body>