Support Service Worker NavigationPreload with PlzNavigate.

content/browser/service_worker/service_worker_provider_host.h

Index: content/browser/service_worker/service_worker_provider_host.h
diff --git a/content/browser/service_worker/service_worker_provider_host.h b/content/browser/service_worker/service_worker_provider_host.h
index 24d33e0711e31909defc5cce81f9af920bb3328b..8dd8fe16b56c3044171d36843cd362c2ccf91ae5 100644
--- a/content/browser/service_worker/service_worker_provider_host.h
+++ b/content/browser/service_worker/service_worker_provider_host.h
@@ -31,6 +31,7 @@ class BlobStorageContext;
 
 namespace content {
 
+class ResourceMessageFilter;
 class ResourceRequestBodyImpl;
 class ServiceWorkerContextCore;
 class ServiceWorkerDispatcherHost;
@@ -232,6 +233,14 @@ class CONTENT_EXPORT ServiceWorkerProviderHost
       int frame_routing_id,
       ServiceWorkerDispatcherHost* dispatcher_host);
 
+  // PlzNavigate
+  // Keeps the ResourceMessageFilter for navigation preload.
+  void set_resource_filter_for_navigation_preload(
+      scoped_refptr<ResourceMessageFilter> filter);
+  ResourceMessageFilter* resource_filter_for_navigation_preload() {
+    return resource_filter_for_navigation_preload_.get();
+  }
+
   // Sends event messages to the renderer. Events for the worker are queued up
   // until the worker thread id is known via SetReadyToSendMessagesToWorker().
   void SendUpdateFoundMessage(
@@ -374,6 +383,8 @@ class CONTENT_EXPORT ServiceWorkerProviderHost
 
   std::vector<base::Closure> queued_events_;
 
+  scoped_refptr<ResourceMessageFilter> resource_filter_for_navigation_preload_;
+
   DISALLOW_COPY_AND_ASSIGN(ServiceWorkerProviderHost);
 };