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This CL adds additional metadata to video frames being output by the new
media::VideoDecoders to mark the frames as POWER_EFFICIENT.

TEST=./video_decode_accelerator_tests

BUG=998547

Change-Id: I7b6c1c91c4ff43fbfc6f4f49fe9d2ffb8e2e401e
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1792206Reviewed-by: Hirokazu Honda <hiroh@chromium.org>
Commit-Queue: David Staessens <dstaessens@chromium.org>
Cr-Commit-Position: refs/heads/master@{#699562}