Run subscribe only when serviceWorker.ready resolves

The register promise may resolve even when the serviceWorker is not ready,
this makes sure it is ready to setup a subscription.

push-clients/index.js

@@ -1,5 +1,7 @@
 // Register a Service Worker.
-navigator.serviceWorker.register('service-worker.js')
+navigator.serviceWorker.register('service-worker.js');
+
+navigator.serviceWorker.ready
 .then(function(registration) {
   // Use the PushManager to get the user's subscription to the push service.
   return registration.pushManager.getSubscription()

push-get-payload/index.js

@@ -1,5 +1,7 @@
 // Register a Service Worker.
-navigator.serviceWorker.register('service-worker.js')
+navigator.serviceWorker.register('service-worker.js');
+
+navigator.serviceWorker.ready
 .then(function(registration) {
   // Use the PushManager to get the user's subscription to the push service.
   return registration.pushManager.getSubscription()

push-payload/index.js

@@ -1,5 +1,7 @@
 // Register a Service Worker.
-navigator.serviceWorker.register('service-worker.js')
+navigator.serviceWorker.register('service-worker.js');
+
+navigator.serviceWorker.ready
 .then(function(registration) {
   // Use the PushManager to get the user's subscription to the push service.
   return registration.pushManager.getSubscription()

push-quota/index.js

@@ -1,5 +1,7 @@
 // Register a Service Worker.
-navigator.serviceWorker.register('service-worker.js')
+navigator.serviceWorker.register('service-worker.js');
+
+navigator.serviceWorker.ready
 .then(function(registration) {
   // Use the PushManager to get the user's subscription to the push service.
   return registration.pushManager.getSubscription()

push-replace/index.js

@@ -1,5 +1,7 @@
 // Register a Service Worker.
-navigator.serviceWorker.register('service-worker.js')
+navigator.serviceWorker.register('service-worker.js');
+
+navigator.serviceWorker.ready
 .then(function(registration) {
   // Use the PushManager to get the user's subscription to the push service.
   return registration.pushManager.getSubscription()

push-rich/index.js

@@ -1,5 +1,7 @@
 // Register a Service Worker.
-navigator.serviceWorker.register('service-worker.js')
+navigator.serviceWorker.register('service-worker.js');
+
+navigator.serviceWorker.ready
 .then(function(registration) {
   // Use the PushManager to get the user's subscription to the push service.
   return registration.pushManager.getSubscription()

push-simple/index.js

@@ -1,5 +1,7 @@
 // Register a Service Worker.
-navigator.serviceWorker.register('service-worker.js')
+navigator.serviceWorker.register('service-worker.js');
+
+navigator.serviceWorker.ready
 .then(function(registration) {
   // Use the PushManager to get the user's subscription to the push service.
   return registration.pushManager.getSubscription()