[page_load_metrics] User Initiated Abort Tracking (Observer version)

components/page_load_metrics/browser/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 "components/page_load_metrics/browser/page_load_metrics_util.h"
 
 #include <algorithm>
 
 #include "components/page_load_metrics/common/page_load_timing.h"
 
 namespace page_load_metrics {
 
 base::TimeDelta GetFirstContentfulPaint(const PageLoadTiming& timing) {
   if (timing.first_text_paint.is_zero())
     return timing.first_image_paint;
   if (timing.first_image_paint.is_zero())
     return timing.first_text_paint;
   return std::min(timing.first_text_paint, timing.first_image_paint);
 }
 
+base::TimeDelta GetBackgroundDelta(const PageLoadExtraInfo& info) {
+  if (info.first_background_time.is_zero() && info.started_in_foreground)
+    return base::TimeDelta::Max();
+  return info.first_background_time;
+}
+
 }  // namespace page_load_metrics