PlzNavigate: Make ServiceWorker work with PlzNavigate.

content/common/service_worker/service_worker_types.h

Index: content/common/service_worker/service_worker_types.h
diff --git a/content/common/service_worker/service_worker_types.h b/content/common/service_worker/service_worker_types.h
index bfb087f4bb726163b83af47b345159f96b1440bf..e3c51a4f0f0f1387e30095d137226ac8d224cd3c 100644
--- a/content/common/service_worker/service_worker_types.h
+++ b/content/common/service_worker/service_worker_types.h
@@ -35,6 +35,10 @@ static const int kDocumentMainThreadId = 0;
 // and embedded worker.
 static const int kInvalidServiceWorkerRequestId = -1;
 
+// PlzNavigate
+// This value is used for the render_process_id for navigations.
+static const int kVirtualProcessIDForBrowserRequest = -2;
+
 // Constants for error messages.
 extern const char kServiceWorkerRegisterErrorPrefix[];
 extern const char kServiceWorkerUpdateErrorPrefix[];