Slice enum HttpResponseInfo::ConnectionInfo by QUIC version.
This will surface QUIC version information in both
HttpResponseInfo::connection_info and
HttpResponseInfo::alpn_negotiated_protocol, which will then show up in
HttpResponseInfo.ConnectionInfo histograms, as well as on the Web platform in
chrome.loadtimes().
CQ_INCLUDE_TRYBOTS=master.tryserver.chromium.linux:linux_site_isolation
BUG=
552397
Committed:
https://crrev.com/90be5dd78a10259fbf4df3c7c181bbffebd98348
Cr-Commit-Position: refs/heads/master@{#430946}