Add support for tracking loading behavior of child frames.

chrome/browser/page_load_metrics/page_load_metrics_util.cc

Index: chrome/browser/page_load_metrics/page_load_metrics_util.cc
diff --git a/chrome/browser/page_load_metrics/page_load_metrics_util.cc b/chrome/browser/page_load_metrics/page_load_metrics_util.cc
index ae5953b1738f45cf16599bf92e51d71c6712cb15..c46b912d31ac8de7e17b6a7f7ce41ba68f687f81 100644
--- a/chrome/browser/page_load_metrics/page_load_metrics_util.cc
+++ b/chrome/browser/page_load_metrics/page_load_metrics_util.cc
@@ -103,4 +103,14 @@ base::Optional<base::TimeDelta> OptionalMin(
   return base::Optional<base::TimeDelta>(std::min(a.value(), b.value()));
 }
 
+bool DidObserveLoadingBehaviorInAnyFrame(
+    const page_load_metrics::PageLoadExtraInfo& info,
+    blink::WebLoadingBehaviorFlag behavior) {
+  const int all_frame_loading_behavior_flags =
+      info.main_frame_metadata.behavior_flags |
+      info.child_frame_metadata.behavior_flags;
+
+  return (all_frame_loading_behavior_flags & behavior) != 0;
+}
+
 }  // namespace page_load_metrics