[Page Load Metrics] Add mojom file to page load metrics.

chrome/browser/page_load_metrics/observers/previews_page_load_metrics_observer.cc

Index: chrome/browser/page_load_metrics/observers/previews_page_load_metrics_observer.cc
diff --git a/chrome/browser/page_load_metrics/observers/previews_page_load_metrics_observer.cc b/chrome/browser/page_load_metrics/observers/previews_page_load_metrics_observer.cc
index 0a4f0d71de7721dbb15f79506aa40894f0873f61..2e02ad9a02e66ea3b487ddd6e829c4bd9ce263f7 100644
--- a/chrome/browser/page_load_metrics/observers/previews_page_load_metrics_observer.cc
+++ b/chrome/browser/page_load_metrics/observers/previews_page_load_metrics_observer.cc
@@ -61,59 +61,59 @@ PreviewsPageLoadMetricsObserver::ShouldObserveMimeType(
 }
 
 void PreviewsPageLoadMetricsObserver::OnDomContentLoadedEventStart(
-    const page_load_metrics::PageLoadTiming& timing,
+    const page_load_metrics::mojom::PageLoadTiming& timing,
     const page_load_metrics::PageLoadExtraInfo& info) {
   if (!WasStartedInForegroundOptionalEventInForeground(
-          timing.document_timing.dom_content_loaded_event_start, info)) {
+          timing.document_timing->dom_content_loaded_event_start, info)) {
     return;
   }
   PAGE_LOAD_HISTOGRAM(
       internal::kHistogramOfflinePreviewsDOMContentLoadedEventFired,
-      timing.document_timing.dom_content_loaded_event_start.value());
+      timing.document_timing->dom_content_loaded_event_start.value());
 }
 
 void PreviewsPageLoadMetricsObserver::OnLoadEventStart(
-    const page_load_metrics::PageLoadTiming& timing,
+    const page_load_metrics::mojom::PageLoadTiming& timing,
     const page_load_metrics::PageLoadExtraInfo& info) {
   if (!WasStartedInForegroundOptionalEventInForeground(
-          timing.document_timing.load_event_start, info)) {
+          timing.document_timing->load_event_start, info)) {
     return;
   }
   PAGE_LOAD_HISTOGRAM(internal::kHistogramOfflinePreviewsLoadEventFired,
-                      timing.document_timing.load_event_start.value());
+                      timing.document_timing->load_event_start.value());
 }
 
 void PreviewsPageLoadMetricsObserver::OnFirstLayout(
-    const page_load_metrics::PageLoadTiming& timing,
+    const page_load_metrics::mojom::PageLoadTiming& timing,
     const page_load_metrics::PageLoadExtraInfo& info) {
   if (!WasStartedInForegroundOptionalEventInForeground(
-          timing.document_timing.first_layout, info)) {
+          timing.document_timing->first_layout, info)) {
     return;
   }
   PAGE_LOAD_HISTOGRAM(internal::kHistogramOfflinePreviewsFirstLayout,
-                      timing.document_timing.first_layout.value());
+                      timing.document_timing->first_layout.value());
 }
 
 void PreviewsPageLoadMetricsObserver::OnFirstContentfulPaintInPage(
-    const page_load_metrics::PageLoadTiming& timing,
+    const page_load_metrics::mojom::PageLoadTiming& timing,
     const page_load_metrics::PageLoadExtraInfo& info) {
   if (!WasStartedInForegroundOptionalEventInForeground(
-          timing.paint_timing.first_contentful_paint, info)) {
+          timing.paint_timing->first_contentful_paint, info)) {
     return;
   }
   PAGE_LOAD_HISTOGRAM(internal::kHistogramOfflinePreviewsFirstContentfulPaint,
-                      timing.paint_timing.first_contentful_paint.value());
+                      timing.paint_timing->first_contentful_paint.value());
 }
 
 void PreviewsPageLoadMetricsObserver::OnParseStart(
-    const page_load_metrics::PageLoadTiming& timing,
+    const page_load_metrics::mojom::PageLoadTiming& timing,
     const page_load_metrics::PageLoadExtraInfo& info) {
   if (!WasStartedInForegroundOptionalEventInForeground(
-          timing.parse_timing.parse_start, info)) {
+          timing.parse_timing->parse_start, info)) {
     return;
   }
   PAGE_LOAD_HISTOGRAM(internal::kHistogramOfflinePreviewsParseStart,
-                      timing.parse_timing.parse_start.value());
+                      timing.parse_timing->parse_start.value());
 }
 
 bool PreviewsPageLoadMetricsObserver::IsOfflinePreview(