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It returns whether uploading data to Google is enabled for a given
ModelType, i.e. whether Sync is active and not in an error state.
There are three possible return values: INITIALIZING (enabled in
principle, but we don't know yet whether we'll encounter e.g. an
auth error), ACTIVE (data is being uploaded to Google), or
NOT_ACTIVE (uploading is either disabled entirely or in a permanent
auth error state).

Change-Id: I86894453bba17cfb6cd94bb3a5c82f915750ea06
Reviewed-on: https://chromium-review.googlesource.com/968821Reviewed-by: Jan Krcal <jkrcal@chromium.org>
Commit-Queue: Marc Treib <treib@chromium.org>
Cr-Commit-Position: refs/heads/master@{#544751}