M57: Add UseCounter for ServiceWorkerNavigationPreload.

content/public/common/resource_response_info.h

Index: content/public/common/resource_response_info.h
diff --git a/content/public/common/resource_response_info.h b/content/public/common/resource_response_info.h
index 386ab96922217ac890decefd77e13a455e382eef..1a09c1695851df79f57ef0783334338598a90d47 100644
--- a/content/public/common/resource_response_info.h
+++ b/content/public/common/resource_response_info.h
@@ -178,6 +178,10 @@ struct CONTENT_EXPORT ResourceResponseInfo {
   // In case this is a CORS response fetched by a ServiceWorker, this is the
   // set of headers that should be exposed.
   std::vector<std::string> cors_exposed_header_names;
+
+  // True if service worker navigation preload was performed due to the request
+  // for this response.
+  bool did_service_worker_navigation_preload;
 };
 
 }  // namespace content