Record UMA for parser blocking time for scripts inserted via doc.write

components/page_load_metrics/browser/metrics_web_contents_observer.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/metrics_web_contents_observer.h"
 
 #include <algorithm>
 #include <string>
 #include <utility>
 
@@ skipping 100 matching lines @@
     const base::TimeDelta parse_duration =
         timing.parse_stop - timing.parse_start;
     if (timing.parse_blocked_on_script_load_duration > parse_duration) {
       NOTREACHED() << "Invalid parse_blocked_on_script_load_duration "
                    << timing.parse_blocked_on_script_load_duration
                    << " for parse duration " << parse_duration;
       return false;
     }
   }
 
+  if (timing.parse_blocked_on_script_load_from_document_write_duration >
+      timing.parse_blocked_on_script_load_duration) {
+    NOTREACHED()
+        << "Invalid parse_blocked_on_script_load_from_document_write_duration "
+        << timing.parse_blocked_on_script_load_from_document_write_duration
+        << " for parse_blocked_on_script_load_duration "
+        << timing.parse_blocked_on_script_load_duration;
+    return false;
+  }
+
   if (!EventsInOrder(timing.dom_loading,
                      timing.dom_content_loaded_event_start)) {
     NOTREACHED() << "Invalid dom_loading " << timing.dom_loading
                  << " for dom_content_loaded_event_start "
                  << timing.dom_content_loaded_event_start;
     return false;
   }
 
   if (!EventsInOrder(timing.dom_content_loaded_event_start,
                      timing.load_event_start)) {
@@ skipping 574 matching lines @@
 
   if (!committed_load_->UpdateTiming(timing)) {
     // If the page load tracker cannot update its timing, something is wrong
     // with the IPC (it's from another load, or it's invalid in some other way).
     // We expect this to be a rare occurrence.
     RecordInternalError(ERR_BAD_TIMING_IPC);
   }
 }
 
 }  // namespace page_load_metrics