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https://codereview.chromium.org/2334223009 caused AVDA to avoid VPx
content < 360p.  Unfortunately, it did not have an exception for
encrypted content.

This CL adds an addition "encrypted only" profile that covers all
supported sizes.

BUG=647259, 642948

Review-Url: https://codereview.chromium.org/2348653002
Cr-Commit-Position: refs/heads/master@{#419108}