Add support for tracking loading behavior of child frames.

chrome/browser/page_load_metrics/page_load_metrics_util.h

Index: chrome/browser/page_load_metrics/page_load_metrics_util.h
diff --git a/chrome/browser/page_load_metrics/page_load_metrics_util.h b/chrome/browser/page_load_metrics/page_load_metrics_util.h
index b3cac49373e1ea198e33a598f3e2213da323629d..b166400fc073fe4b62329a331184ec0df4a94275 100644
--- a/chrome/browser/page_load_metrics/page_load_metrics_util.h
+++ b/chrome/browser/page_load_metrics/page_load_metrics_util.h
@@ -9,6 +9,7 @@
 #include "base/optional.h"
 #include "base/time/time.h"
 #include "chrome/browser/page_load_metrics/page_load_metrics_observer.h"
+#include "third_party/WebKit/public/platform/WebLoadingBehaviorFlag.h"
 
 // Up to 10 minutes, with 100 buckets.
 #define PAGE_LOAD_HISTOGRAM(name, sample)                           \
@@ -124,6 +125,12 @@ base::Optional<base::TimeDelta> OptionalMin(
     const base::Optional<base::TimeDelta>& a,
     const base::Optional<base::TimeDelta>& b);
 
+// Whether the given loading behavior was observed in any frame (either the main
+// frame or a child frame).
+bool DidObserveLoadingBehaviorInAnyFrame(
+    const page_load_metrics::PageLoadExtraInfo& info,
+    blink::WebLoadingBehaviorFlag behavior);
+
 }  // namespace page_load_metrics
 
 #endif  // CHROME_BROWSER_PAGE_LOAD_METRICS_PAGE_LOAD_METRICS_UTIL_H_