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

components/page_load_metrics/browser/metrics_web_contents_observer.cc

Index: components/page_load_metrics/browser/metrics_web_contents_observer.cc
diff --git a/components/page_load_metrics/browser/metrics_web_contents_observer.cc b/components/page_load_metrics/browser/metrics_web_contents_observer.cc
index 50f071523618a7aacccb39df8d8be58ab9d56d44..7b411cc1ba264e2b17abd428b475a8a145a236f6 100644
--- a/components/page_load_metrics/browser/metrics_web_contents_observer.cc
+++ b/components/page_load_metrics/browser/metrics_web_contents_observer.cc
@@ -118,6 +118,16 @@ bool IsValidPageLoadTiming(const PageLoadTiming& timing) {
     }
   }
 
+  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