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This describes the capability (supported features) of a CDM. Add a new
struct for it to simplify a lot of code.

Bug: 848532
Change-Id: Iaf83bad1ebe4882e8fbc0a1786b2d9898ef9a52b
Reviewed-on: https://chromium-review.googlesource.com/1110602Reviewed-by: Alex Moshchuk <alexmos@chromium.org>
Reviewed-by: Frank Liberato <liberato@chromium.org>
Reviewed-by: Lei Zhang <thestig@chromium.org>
Commit-Queue: Xiaohan Wang <xhwang@chromium.org>
Cr-Commit-Position: refs/heads/master@{#569711}