The following revision refers to this bug:
  https://chromium.googlesource.com/chromium/src.git/+/8b3609dffc9ba43e89cb1a184d16a8495ab081a5

commit 8b3609dffc9ba43e89cb1a184d16a8495ab081a5
Author: Matt Falkenhagen <falken@chromium.org>
Date: Thu Jul 12 23:57:12 2018

service worker: Add FirstInputDelay to controlled page load metrics.

FID is becoming a trusted page load metric.

Bug:  862895 
Change-Id: Ib434d2f2e203a986c29928909af32427aa0c30c7
Reviewed-on: https://chromium-review.googlesource.com/1134641
Reviewed-by: Kenichi Ishibashi <bashi@chromium.org>
Reviewed-by: Kinuko Yasuda <kinuko@chromium.org>
Reviewed-by: Ilya Sherman <isherman@chromium.org>
Commit-Queue: Matt Falkenhagen <falken@chromium.org>
Cr-Commit-Position: refs/heads/master@{#574777}
[modify] https://crrev.com/8b3609dffc9ba43e89cb1a184d16a8495ab081a5/chrome/browser/page_load_metrics/observers/service_worker_page_load_metrics_observer.cc
[modify] https://crrev.com/8b3609dffc9ba43e89cb1a184d16a8495ab081a5/chrome/browser/page_load_metrics/observers/service_worker_page_load_metrics_observer.h
[modify] https://crrev.com/8b3609dffc9ba43e89cb1a184d16a8495ab081a5/chrome/browser/page_load_metrics/observers/service_worker_page_load_metrics_observer_unittest.cc
[modify] https://crrev.com/8b3609dffc9ba43e89cb1a184d16a8495ab081a5/tools/metrics/histograms/histograms.xml