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..4b3fda6046a1f0ec3a9b17f9511ccbf707e61ecf 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 kHistogramNoServiceWorkerFirstContentfulPaintSearch[];
+extern const char kHistogramNoServiceWorkerFirstMeaningfulPaintSearch[];
+extern const char
+    kHistogramNoServiceWorkerParseStartToFirstMeaningfulPaintSearch[];
+extern const char
+    kHistogramNoServiceWorkerParseStartToFirstContentfulPaintSearch[];
+extern const char kHistogramNoServiceWorkerDomContentLoadedSearch[];
+extern const char kHistogramNoServiceWorkerLoadSearch[];
+
 }  // namespace internal
 
 class ServiceWorkerPageLoadMetricsObserver