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CdmInfo will now keep track of the encryption schemes supported by each
registered CDM. For component-updated Widevine, this will be determined
from the manifest. For built-in CDMs, this list is compiled in.

The set of encryption schemes supported is also passed to KeySystemSupport.

BUG=657957,658026
TEST=new content_unittests pass

Change-Id: I444091035e7ae1bc18720aff5bfea86afeca5ba7
Reviewed-on: https://chromium-review.googlesource.com/1019884Reviewed-by: Daniel Cheng <dcheng@chromium.org>
Reviewed-by: Nasko Oskov <nasko@chromium.org>
Reviewed-by: Lei Zhang <thestig@chromium.org>
Reviewed-by: Joshua Pawlicki <waffles@chromium.org>
Reviewed-by: Xiaohan Wang <xhwang@chromium.org>
Commit-Queue: John Rummell <jrummell@chromium.org>
Cr-Commit-Position: refs/heads/master@{#555150}