Metrics for document.write script blocking

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/browser/page_load_metrics_observer.h"
 #include "components/page_load_metrics/common/page_load_timing.h"
 
 namespace page_load_metrics {
 
-bool WasStartedInForegroundEventInForeground(base::TimeDelta event,
+bool WasStartedInForegroundEventInForeground(const base::TimeDelta& event,
                                              const PageLoadExtraInfo& info) {
   return info.started_in_foreground && !event.is_zero() &&
          (info.first_background_time.is_zero() ||
           event < info.first_background_time);
 }
 
+bool WasParseInForeground(const base::TimeDelta& parse_start,
+                          const base::TimeDelta& parse_stop,
+                          const PageLoadExtraInfo& info) {
+  if (parse_start.is_zero()) {
+    return false;
+  }
+  // If the parse did not complete but the entire page load duration happened
+  // in the foreground, or if the parse completed and happened entirely in the
+  // foreground, record a foreground histogram.

[jkarlin, 2016/04/27 14:28:16]

This comment belongs in the header.

[shivanisha, 2016/04/27 15:34:38]

Moved.

+  const bool incomplete_parse_in_foreground =
+      parse_stop.is_zero() && info.started_in_foreground &&
+      info.first_background_time.is_zero();
+
+  return incomplete_parse_in_foreground ||
+         WasStartedInForegroundEventInForeground(parse_stop, info);
+}
 }  // namespace page_load_metrics