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Reduce copies of PipelineMetada (which contains AudioDecoderConfig
and VideoDecoderConfig) by using pass by reference.

This was originally authored by Andre Rosa<andre.rosa@lge.com>

Change-Id: I9ddf137d5d35154862501edcbbfe5b26c1dacbf0
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1601613
Commit-Queue: Dale Curtis <dalecurtis@chromium.org>
Reviewed-by: Dale Curtis <dalecurtis@chromium.org>
Reviewed-by: John Rummell <jrummell@chromium.org>
Cr-Commit-Position: refs/heads/master@{#658829}