Add support for tracking loading behavior of child frames.

chrome/browser/page_load_metrics/page_load_metrics_util.cc

 // Copyright 2015 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "chrome/browser/page_load_metrics/page_load_metrics_util.h"
 
 #include <algorithm>
 
 #include "chrome/common/page_load_metrics/page_load_timing.h"
 
@@ skipping 85 matching lines @@
     const base::Optional<base::TimeDelta>& b) {
   if (a && !b)
     return a;
   if (b && !a)
     return b;
   if (!a && !b)
     return a;  // doesn't matter which
   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