Fix secureConnectionStart when connection is reused

Per ResourceTiming spec, if a connection is reused
then secureConnectionStart must return fetchStart, not 0.

Bug: 404501
Change-Id: Ica208c98cfea0afa9dd22e4edc83cc3c430c219f
Reviewed-on: https://chromium-review.googlesource.com/c/1363906
Commit-Queue: Nicolás Peña Moreno <npm@chromium.org>
Reviewed-by: Yoav Weiss <yoavweiss@chromium.org>
Cr-Commit-Position: refs/heads/master@{#614849}
2 files changed