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This class logs metrics when core Phone Hub functionality is used,
which will be used to log our 28DA user count.

Note that this class is not actually instantiated; a follow-up CL
creates an instance of this class and calls its instance functions.

Bug: 1150634, 1106937
Change-Id: I224a1dd25d5d7f48b601392843d1a31a72d6743c
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2576474Reviewed-by: Robert Kaplow <rkaplow@chromium.org>
Reviewed-by: Regan Hsu <hsuregan@chromium.org>
Commit-Queue: Kyle Horimoto <khorimoto@chromium.org>
Auto-Submit: Kyle Horimoto <khorimoto@chromium.org>
Cr-Commit-Position: refs/heads/master@{#835664}