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Also parse supported CdmProxy::Protocol from CDM manifest. For CDMs
supporting hardware secure decryption, the supported CdmProxy protocol
should be specified in CDM manifest, e.g. for kIntel protocol:

"x-cdm-supported-cdm-proxy-protocols": ["intel"],

In the next CL, we'll check whether the supported CdmProxy protocol
is also supported by the system.

Bug: 848532
Test: Updated unit tests.
Change-Id: I59567943620e672d72f72fdadd80cb3ce6c5bcfd
Reviewed-on: https://chromium-review.googlesource.com/1111109
Commit-Queue: Xiaohan Wang <xhwang@chromium.org>
Reviewed-by: Joshua Pawlicki <waffles@chromium.org>
Reviewed-by: John Rummell <jrummell@chromium.org>
Reviewed-by: Lei Zhang <thestig@chromium.org>
Reviewed-by: Alex Moshchuk <alexmos@chromium.org>
Cr-Commit-Position: refs/heads/master@{#569889}