Implement FetchEvent.navigationPreload

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 622ed930e1addf33f73b1cf960a923ab1d9f2847..01f8b1a1dceb4bc99a3231ccfd553711735d3f58 100644
--- a/content/renderer/service_worker/service_worker_context_client.h
+++ b/content/renderer/service_worker/service_worker_context_client.h
@@ -193,6 +193,9 @@ class ServiceWorkerContextClient
   void registerForeignFetchScopes(
       const blink::WebVector<blink::WebURL>& sub_scopes,
       const blink::WebVector<blink::WebSecurityOrigin>& origins) override;
+  void registerPreloadResponseCallback(
+      int eventID,
+      blink::WebServiceWorkerPreloadResponseCallbacks*) override;
 
   virtual void DispatchSyncEvent(
       const std::string& tag,
@@ -202,6 +205,7 @@ class ServiceWorkerContextClient
  private:
   struct WorkerContextData;
   class FetchEventDispatcherImpl;
+  class PreloadRequest;
 
   // Get routing_id for sending message to the ServiceWorkerVersion
   // in the browser process.
@@ -220,6 +224,7 @@ class ServiceWorkerContextClient
   void OnInstallEvent(int request_id);
   void DispatchFetchEvent(int fetch_event_id,
                           const ServiceWorkerFetchRequest& request,
+                          std::unique_ptr<PreloadRequest> preload_request,
                           const FetchCallback& callback);
   void OnNotificationClickEvent(
       int request_id,