Add UKM for legacy TLS versions.

Bug: 896013
Change-Id: I5beb02a1d4716a8fe556f2caec2f682a0643e0c8
Reviewed-on: https://chromium-review.googlesource.com/c/1352514
Commit-Queue: David Benjamin <davidben@chromium.org>
Reviewed-by: Steven Holte <holte@chromium.org>
Reviewed-by: Nate Chapin <japhet@chromium.org>
Cr-Commit-Position: refs/heads/master@{#614899}
2 files changed