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We used to have these checks in PpapiCdmAdapter, but they were lost when
we added media::CdmAdapter.

In summary:
- Only allow storage ID when |allow_persistent_state| is true.
- Only allow File IO when |allow_persistent_state| is true.
- Only allow platform challenge when |allow_distinctive_identifier| is
  true.

Also post tasks in CdmAdapter in failure cases to avoid reentrance into
the CDM instance.

this change. Filed crbug.com/836046 to refactor CdmAdapter and tests.

Test: The current CdmAdapterTest makes it harder to add unittest for
Bug: 510088,836046
Change-Id: I5a88c253a75a3af00f553681b65792198f31dba7
Reviewed-on: https://chromium-review.googlesource.com/1025220Reviewed-by: John Rummell <jrummell@chromium.org>
Commit-Queue: Xiaohan Wang <xhwang@chromium.org>
Cr-Commit-Position: refs/heads/master@{#553373}