Reland of [ServiceWorker] Mojofy PushEvent of Service Worker.

content/common/service_worker/service_worker_event_dispatcher.mojom

Index: content/common/service_worker/service_worker_event_dispatcher.mojom
diff --git a/content/common/service_worker/service_worker_event_dispatcher.mojom b/content/common/service_worker/service_worker_event_dispatcher.mojom
index df445a8052fc7880244ed0318caa2feb7de6377c..00b20e1e1d2de96a395ebdb6a69e1e7f81e40ff2 100644
--- a/content/common/service_worker/service_worker_event_dispatcher.mojom
+++ b/content/common/service_worker/service_worker_event_dispatcher.mojom
@@ -13,6 +13,9 @@ import "third_party/WebKit/public/platform/modules/serviceworker/service_worker_
 import "url/mojo/origin.mojom";
 
 [Native]
+struct PushEventPayload;
+
+[Native]
 struct ServiceWorkerFetchRequest;
 
 [Native]
@@ -40,6 +43,9 @@ interface ServiceWorkerEventDispatcher {
                      FetchEventPreloadHandle? preload_handle)
       => (blink.mojom.ServiceWorkerEventStatus status,
           mojo.common.mojom.Time dispatch_event_time);
+  DispatchPushEvent(PushEventPayload payload)
+      => (blink.mojom.ServiceWorkerEventStatus status,
+          mojo.common.mojom.Time dispatch_event_time);
   // Arguments are passed to the event handler as parameters of SyncEvent.
   // Ref: https://wicg.github.io/BackgroundSync/spec/#sync-event
   DispatchSyncEvent(string tag,