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Notifications can be disabled for a number of
reasons. This logs those reasons with UMA.

This is a retry of my earlier CL, but does
not abort if getting settings failed (not
a fatal failure anyway).

Bug: 734095
Change-Id: I9a04f666e8181d87fd945fcdcac0c3a0371aa2f0
Reviewed-on: https://chromium-review.googlesource.com/995536Reviewed-by: Xi Cheng <chengx@chromium.org>
Commit-Queue: Finnur Thorarinsson <finnur@chromium.org>
Cr-Commit-Position: refs/heads/master@{#548287}