Adding DRP specfic UMA for FirstContentfulPaint

components/page_load_metrics/browser/page_load_metrics_observer.cc

Index: components/page_load_metrics/browser/page_load_metrics_observer.cc
diff --git a/components/page_load_metrics/browser/page_load_metrics_observer.cc b/components/page_load_metrics/browser/page_load_metrics_observer.cc
index b41c347c1f9a827aa3609efc5a728c753c9cd830..6e9c8ab7bba62ea519de541a30eb43103f1e7548 100644
--- a/components/page_load_metrics/browser/page_load_metrics_observer.cc
+++ b/components/page_load_metrics/browser/page_load_metrics_observer.cc
@@ -6,20 +6,24 @@
 
 namespace page_load_metrics {
 
 PageLoadExtraInfo::PageLoadExtraInfo(
     const base::TimeDelta& first_background_time,
     const base::TimeDelta& first_foreground_time,
     bool started_in_foreground,
     const GURL& committed_url,
     const base::TimeDelta& time_to_commit,
     UserAbortType abort_type,
-    const base::TimeDelta& time_to_abort)
+    const base::TimeDelta& time_to_abort,
+    bool is_using_lofi,
+    bool data_reduction_proxy_used)
     : first_background_time(first_background_time),
       first_foreground_time(first_foreground_time),
       started_in_foreground(started_in_foreground),
       committed_url(committed_url),
       time_to_commit(time_to_commit),
       abort_type(abort_type),
-      time_to_abort(time_to_abort) {}
+      time_to_abort(time_to_abort),
+      is_using_lofi(is_using_lofi),
+      was_fetched_via_data_reduction_proxy(data_reduction_proxy_used) {}
 
 }  // namespace page_load_metrics