Add support for tracking loading behavior of child frames.

chrome/browser/page_load_metrics/page_load_metrics_util.h

 // 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.
 
 #ifndef CHROME_BROWSER_PAGE_LOAD_METRICS_PAGE_LOAD_METRICS_UTIL_H_
 #define CHROME_BROWSER_PAGE_LOAD_METRICS_PAGE_LOAD_METRICS_UTIL_H_
 
 #include "base/metrics/histogram_macros.h"
 #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)                           \
   UMA_HISTOGRAM_CUSTOM_TIMES(name, sample,                          \
                              base::TimeDelta::FromMilliseconds(10), \
                              base::TimeDelta::FromMinutes(10), 100)
 
 // Up to 1 hour, with 100 buckets.
 #define PAGE_LOAD_LONG_HISTOGRAM(name, sample)                      \
   UMA_HISTOGRAM_CUSTOM_TIMES(name, sample,                          \
@@ skipping 95 matching lines @@
     const PageLoadExtraInfo& info,
     base::TimeTicks app_background_time);
 
 // Returns the minimum value of the optional TimeDeltas, if both values are
 // set. Otherwise, if one value is set, returns that value. Otherwise, returns
 // an unset value.
 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_