Update PageLoadTiming to use base::Optional

chrome/browser/page_load_metrics/observers/service_worker_page_load_metrics_observer.cc

Index: chrome/browser/page_load_metrics/observers/service_worker_page_load_metrics_observer.cc
diff --git a/chrome/browser/page_load_metrics/observers/service_worker_page_load_metrics_observer.cc b/chrome/browser/page_load_metrics/observers/service_worker_page_load_metrics_observer.cc
index 8d12a74c8037a1c0339e28a8faf0d62ff88b696b..0811fe96efe8794ec4e3d1f988f47ea2cd2a94bd 100644
--- a/chrome/browser/page_load_metrics/observers/service_worker_page_load_metrics_observer.cc
+++ b/chrome/browser/page_load_metrics/observers/service_worker_page_load_metrics_observer.cc
@@ -61,26 +61,26 @@ void ServiceWorkerPageLoadMetricsObserver::OnFirstContentfulPaint(
     const page_load_metrics::PageLoadExtraInfo& info) {
   if (!IsServiceWorkerControlled(info))
     return;
-  if (!WasStartedInForegroundEventInForeground(timing.first_contentful_paint,
-                                               info)) {
+  if (!WasStartedInForegroundOptionalEventInForeground(
+          timing.first_contentful_paint, info)) {
     PAGE_LOAD_HISTOGRAM(
         internal::kBackgroundHistogramServiceWorkerFirstContentfulPaint,
-        timing.first_contentful_paint);
+        timing.first_contentful_paint.value());
     return;
   }
   PAGE_LOAD_HISTOGRAM(internal::kHistogramServiceWorkerFirstContentfulPaint,
-                      timing.first_contentful_paint);
+                      timing.first_contentful_paint.value());
   PAGE_LOAD_HISTOGRAM(
       internal::kHistogramServiceWorkerParseStartToFirstContentfulPaint,
-      timing.first_contentful_paint - timing.parse_start);
+      timing.first_contentful_paint.value() - timing.parse_start.value());
 
   if (IsInboxSite(info.committed_url)) {
     PAGE_LOAD_HISTOGRAM(
         internal::kHistogramServiceWorkerFirstContentfulPaintInbox,
-        timing.first_contentful_paint);
+        timing.first_contentful_paint.value());
     PAGE_LOAD_HISTOGRAM(
         internal::kHistogramServiceWorkerParseStartToFirstContentfulPaintInbox,
-        timing.first_contentful_paint - timing.parse_start);
+        timing.first_contentful_paint.value() - timing.parse_start.value());
   }
 }
 
@@ -89,15 +89,15 @@ void ServiceWorkerPageLoadMetricsObserver::OnDomContentLoadedEventStart(
     const page_load_metrics::PageLoadExtraInfo& info) {
   if (!IsServiceWorkerControlled(info))
     return;
-  if (!WasStartedInForegroundEventInForeground(
+  if (!WasStartedInForegroundOptionalEventInForeground(
           timing.dom_content_loaded_event_start, info)) {
     return;
   }
   PAGE_LOAD_HISTOGRAM(internal::kHistogramServiceWorkerDomContentLoaded,
-                      timing.dom_content_loaded_event_start);
+                      timing.dom_content_loaded_event_start.value());
   if (IsInboxSite(info.committed_url)) {
     PAGE_LOAD_HISTOGRAM(internal::kHistogramServiceWorkerDomContentLoadedInbox,
-                        timing.dom_content_loaded_event_start);
+                        timing.dom_content_loaded_event_start.value());
   }
 }
 
@@ -106,12 +106,13 @@ void ServiceWorkerPageLoadMetricsObserver::OnLoadEventStart(
     const page_load_metrics::PageLoadExtraInfo& info) {
   if (!IsServiceWorkerControlled(info))
     return;
-  if (!WasStartedInForegroundEventInForeground(timing.load_event_start, info))
+  if (!WasStartedInForegroundOptionalEventInForeground(timing.load_event_start,
+                                                       info))
     return;
   PAGE_LOAD_HISTOGRAM(internal::kHistogramServiceWorkerLoad,
-                      timing.load_event_start);
+                      timing.load_event_start.value());
   if (IsInboxSite(info.committed_url)) {
     PAGE_LOAD_HISTOGRAM(internal::kHistogramServiceWorkerLoadInbox,
-                        timing.load_event_start);
+                        timing.load_event_start.value());
   }
 }