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This enables HEVC as a supported media format if the
ENABLE_PLATFORM_HEVC flag is on and we have enabled clear
HEVC for testing. This also enables the bitstream
conversion in the Chrome OS decoder pipeline.

Another CL enables HEVC for the encrypted path.

BUG=b:153111783,chromium:1141237
TEST=Clear HEVC playback works w/ cmd line flag

Change-Id: I27892296cec353d442178dc8e43f975921e8c036
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2568210Reviewed-by: Dale Curtis <dalecurtis@chromium.org>
Reviewed-by: Chrome Cunningham <chcunningham@chromium.org>
Reviewed-by: Kenneth Russell <kbr@chromium.org>
Reviewed-by: Scott Violet <sky@chromium.org>
Commit-Queue: Jeffrey Kardatzke <jkardatzke@google.com>
Cr-Commit-Position: refs/heads/master@{#836407}