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Intel modified iHD so that we don't need to know full vs. subsample when
we configure the decoder. Now we configure everything properly at the
beginning of decode by knowing the encryption scheme.

BUG=b:153111783,b:155508443
TEST=Full sample H264, subsample CTR H264/HEVC/VP9, subsample CBC H264
work on volteer

Change-Id: I6f4abac5ae8945cfe7c5851d6b07cb6c9f325f64
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2587760Reviewed-by: Jao-ke Chin-Lee <jchinlee@chromium.org>
Commit-Queue: Jeffrey Kardatzke <jkardatzke@google.com>
Cr-Commit-Position: refs/heads/master@{#841270}