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This CL adds suffixes Sync, Drive, and Policy to the existing histogram
FCMInvalidations.FCMMessageStatus. Having all the different senders in
a single histogram made analysis tricky.

Since the sender_id constants aren't accessible at the place where the
histogram is recorded, they're duplicated. This should be okay since
existing sender_ids are not expected to change, and new ones are added
infrequently.

While I'm here, also add myself as an owner of other FCMInvalidations
histograms, since the original owner is OOO.

Bug: 1023813
Change-Id: I41d24f4d61c22641eb0e599176fcfff45f2740c8
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1972841
Commit-Queue: Marc Treib <treib@chromium.org>
Auto-Submit: Marc Treib <treib@chromium.org>
Reviewed-by: Alex Ilin <alexilin@chromium.org>
Reviewed-by: Mikel Astiz <mastiz@chromium.org>
Cr-Commit-Position: refs/heads/master@{#726419}