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Power measurements on a nexus 5 show that there's very little
difference below 360p between hardware and libvpx decoding.  This CL
switches to libvpx decoding for <360p, even if it could be hardware
accelerated by AVDA.

This saves a hardware codec instance, and avoids potential stability
issues with lots of MediaCodecs in use at once.

BUG=647259, 642948
TEST=manually checked 240p and 360p.

Review-Url: https://codereview.chromium.org/2334223009
Cr-Commit-Position: refs/heads/master@{#418964}