Add page/document timing UMAs for search without service worker

chrome/browser/page_load_metrics/observers/service_worker_page_load_metrics_observer.h

Index: chrome/browser/page_load_metrics/observers/service_worker_page_load_metrics_observer.h
diff --git a/chrome/browser/page_load_metrics/observers/service_worker_page_load_metrics_observer.h b/chrome/browser/page_load_metrics/observers/service_worker_page_load_metrics_observer.h
index b6b974d3a6278ea98267ae1122a85eedbaebfca1..79ac7e2eba480bd0d8c1e96dd8567bbccdc7d374 100644
--- a/chrome/browser/page_load_metrics/observers/service_worker_page_load_metrics_observer.h
+++ b/chrome/browser/page_load_metrics/observers/service_worker_page_load_metrics_observer.h
@@ -39,6 +39,15 @@ extern const char
 extern const char kHistogramServiceWorkerDomContentLoadedSearch[];
 extern const char kHistogramServiceWorkerLoadSearch[];
 
+extern const char kHistogramServiceWorkerFirstContentfulPaintSearchNoSW[];
+extern const char kHistogramServiceWorkerFirstMeaningfulPaintSearchNoSW[];
+extern const char
+    kHistogramServiceWorkerParseStartToFirstMeaningfulPaintSearchNoSW[];
+extern const char
+    kHistogramServiceWorkerParseStartToFirstContentfulPaintSearchNoSW[];
+extern const char kHistogramServiceWorkerDomContentLoadedSearchNoSW[];
+extern const char kHistogramServiceWorkerLoadSearchNoSW[];
+
 }  // namespace internal
 
 class ServiceWorkerPageLoadMetricsObserver