[Extensions] Add metrics for including TLS channel ID

Bug: 840412
Change-Id: I3da214023c2e896266e171cb153d367c43d6b2ba
Reviewed-on: https://chromium-review.googlesource.com/1141069
Commit-Queue: Devlin <rdevlin.cronin@chromium.org>
Reviewed-by: Nick Harper <nharper@chromium.org>
Reviewed-by: Ilya Sherman <isherman@chromium.org>
Cr-Commit-Position: refs/heads/master@{#576043}
3 files changed