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We need to know in DataTypeManager why we stopping.
It will helps us determine if we need to clear sync metadata on data type stop.

This is first CL in sequence.

Bug: 823721
Change-Id: I7c20febbfc8ed820018f583f6de16bf3e269333a
Reviewed-on: https://chromium-review.googlesource.com/1091752
Commit-Queue: Aleksei Loshkarev <lixan@yandex-team.ru>
Reviewed-by: Mikel Astiz <mastiz@chromium.org>
Cr-Commit-Position: refs/heads/master@{#565598}