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page load was in the user's content languages.

The user's content languages loosely match the languages the user has
translated to before or has blocked for translation. This new UMA
histogram will therefore give us an idea of how often page loads are in
languages that the user doesn't understand.

Full design doc: https://docs.google.com/document/d/1dyWh1Xw5VgUA00VA-5PTgKQ6ItziPBnSyeDR8saJ9vM/edit?usp=sharing

Bug: 1114868
Change-Id: I170e33a4c36ac5c52bdf4cff2098c1bab94ed0d9
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2559227
Commit-Queue: Max Curran <curranmax@chromium.org>
Reviewed-by: Jesse Doherty <jwd@chromium.org>
Reviewed-by: Scott Little <sclittle@chromium.org>
Reviewed-by: Ryan Sturm <ryansturm@chromium.org>
Cr-Commit-Position: refs/heads/master@{#832641}