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

chrome/browser/page_load_metrics/page_load_tracker.h

Index: chrome/browser/page_load_metrics/page_load_tracker.h
diff --git a/chrome/browser/page_load_metrics/page_load_tracker.h b/chrome/browser/page_load_metrics/page_load_tracker.h
index f6529d1a059d00a620572763477253d17ed8fec0..b3dc9af3aca109493e37c691281dae74735b9a0f 100644
--- a/chrome/browser/page_load_metrics/page_load_tracker.h
+++ b/chrome/browser/page_load_metrics/page_load_tracker.h
@@ -219,13 +219,13 @@ class PageLoadTracker {
 
   void NotifyClientRedirectTo(const PageLoadTracker& destination);
 
-  void UpdateTiming(const PageLoadTiming& timing,
-                    const PageLoadMetadata& metadata);
+  void UpdateTiming(const mojom::PageLoadTiming& timing,
+                    const mojom::PageLoadMetadata& metadata);
 
   // Update metadata for child frames. Updates for child frames arrive
   // separately from updates for the main frame, so aren't included in
   // UpdateTiming.
-  void UpdateChildFrameMetadata(const PageLoadMetadata& child_metadata);
+  void UpdateChildFrameMetadata(const mojom::PageLoadMetadata& child_metadata);
 
   void OnStartedResource(
       const ExtraRequestStartInfo& extra_request_started_info);
@@ -375,9 +375,9 @@ class PageLoadTracker {
   base::TimeTicks foreground_time_;
   bool started_in_foreground_;
 
-  PageLoadTiming timing_;
-  PageLoadMetadata main_frame_metadata_;
-  PageLoadMetadata child_frame_metadata_;
+  mojo::StructPtr<mojom::PageLoadTiming> timing_;
+  mojom::PageLoadMetadata main_frame_metadata_;
+  mojom::PageLoadMetadata child_frame_metadata_;
 
   ui::PageTransition page_transition_;