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Using type 'list' seems like a good idea if the policy is indeed
a list. However, it is not a good idea if it is a list of objects,
and so will need to be parsed as JSON - in that case, 'dict' is a
better fit. Added some documentation explaining why.

Bug: 872765
Change-Id: I5185f515d7bc82048bfb1eaab5d6d9ae61848eea
Reviewed-on: https://chromium-review.googlesource.com/1169469Reviewed-by: Lutz Justen <ljusten@chromium.org>
Commit-Queue: A Olsen <olsen@chromium.org>
Cr-Commit-Position: refs/heads/master@{#582214}