suspected cl : https://chromium.googlesource.com/chromium/src/+/421f622a12697f4ed06d3f5090715e96a3b14527%5E%21/components/page_load_metrics/browser/metrics_web_contents_observer.cc

bmcquade @ could you please look into this. Thanks

ClusterFuzz has detected this issue as fixed in range 408765:408781.

Detailed report: https://cluster-fuzz.appspot.com/testcase?key=6383819192270848

Fuzzer: inferno_twister_custom_bundle
Job Type: linux_debug_chrome
Platform Id: linux

Crash Type: CHECK failure
Crash Address: 
Crash State:
  false. Invalid first_layout (unset) for first_paint 3.795s in metrics_web_conten
  page_load_metrics::IsValidPageLoadTiming
  page_load_metrics::PageLoadTracker::UpdateTiming
  
Regressed: https://cluster-fuzz.appspot.com/revisions?job=linux_debug_chrome&range=137642:137643
Fixed: https://cluster-fuzz.appspot.com/revisions?job=linux_debug_chrome&range=408765:408781

Minimized Testcase (0.07 Kb):
Download: https://cluster-fuzz.appspot.com/download/AMIfv96_b_L_cLQlUB_vGpZ2HQuY0YI9mKusDxYR0jwoFX1gNE85jE9Z7s7VSX6ObUb_4p2GOg3_MUcqHLkTMaveIaweHFqMIzpM9PN20JbnKMhYQ6RHwe7AyKSx4WMU1foCAM99E8HgseJ_t0yQbxbHE4ow0nXqWA?testcase_id=6383819192270848
<style type="text/css">iframe {
    height: 200px;
    border-style: none


Additional requirements: Requires HTTP

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