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These will help us understand user translate behaviour and how it is affected
by various UI decisions. We don't log the cross
(source language, target language) as there are too many combinations to use as
histogram buckets.

Bug: 742684
Change-Id: Idf6a72a6418db820431e75ba1982f260d92bad21
Reviewed-on: https://chromium-review.googlesource.com/572486
Commit-Queue: Michael Martis <martis@chromium.org>
Reviewed-by: Hajime Hoshi <hajimehoshi@chromium.org>
Reviewed-by: Mark Pearson <mpearson@chromium.org>
Cr-Commit-Position: refs/heads/master@{#488130}