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There's 2 things that were wrong. We were not initializing the
VAEncryptionParameters structure we were using, causing bad values to be
present.  We also had a regression error where we then were resubmitting
the VAEncryptionParameters during decode of full sample content. This
fixes both of those.

BUG=b:178039332
TEST=Full sample H264 protected content plays on volteer

Change-Id: I47b82a5f022292290151178cc26266c55b9dff42
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2643536
Commit-Queue: Jeffrey Kardatzke <jkardatzke@google.com>
Commit-Queue: Jao-ke Chin-Lee <jchinlee@chromium.org>
Auto-Submit: Jeffrey Kardatzke <jkardatzke@google.com>
Reviewed-by: Jao-ke Chin-Lee <jchinlee@chromium.org>
Cr-Commit-Position: refs/heads/master@{#845806}