Mojoify FetchEvent of Service Worker.

content/renderer/service_worker/service_worker_context_client.h

Index: content/renderer/service_worker/service_worker_context_client.h
diff --git a/content/renderer/service_worker/service_worker_context_client.h b/content/renderer/service_worker/service_worker_context_client.h
index da4afca71072cce9a7c5871f73c1d9263146a2ba..ea84846e918b6880f136411f18bd2171fbd6bfae 100644
--- a/content/renderer/service_worker/service_worker_context_client.h
+++ b/content/renderer/service_worker/service_worker_context_client.h
@@ -67,6 +67,9 @@ class ServiceWorkerContextClient
   using SyncCallback =
       base::Callback<void(blink::mojom::ServiceWorkerEventStatus,
                           base::Time /* dispatch_event_time */)>;
+  using FetchCallback =
+      base::Callback<void(blink::mojom::ServiceWorkerEventStatus,
+                          base::Time /* dispatch_event_time */)>;
 
   // Returns a thread-specific client instance.  This does NOT create a
   // new instance.
@@ -194,6 +197,7 @@ class ServiceWorkerContextClient
 
  private:
   struct WorkerContextData;
+  class FetchEventDispatcherImpl;
 
   // Get routing_id for sending message to the ServiceWorkerVersion
   // in the browser process.
@@ -210,9 +214,9 @@ class ServiceWorkerContextClient
       int request_id,
       const ServiceWorkerMsg_ExtendableMessageEvent_Params& params);
   void OnInstallEvent(int request_id);
-  void OnFetchEvent(int response_id,
-                    int event_finish_id,
-                    const ServiceWorkerFetchRequest& request);
+  void DispatchFetchEvent(int response_id,
+                          const ServiceWorkerFetchRequest& request,
+                          const FetchCallback& callback);
   void OnNotificationClickEvent(
       int request_id,
       const std::string& notification_id,