Added in UMA metrics for UITabHelperOfflineErrors.

Bug: 955471
Change-Id: I6185fe047d762961940b082ad33627deef3a290e
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1578187
Reviewed-by: Tarun Bansal <tbansal@chromium.org>
Reviewed-by: Robert Ogden <robertogden@chromium.org>
Commit-Queue: Sean Harrison <harrisonsean@chromium.org>
Cr-Commit-Position: refs/heads/master@{#654130}
2 files changed