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Modifiers are associated with buffers.  They
need to be passed along to V4L2 decoders so
they can take advantage of the modifier.

BUG=b:149525848
TEST=decode with modifiers on trogdor
TEST=PlatformVideoFramePoolTest.ModifierIsPassed

Change-Id: I2708918d6fce43f75579908ab9f3292f03aa0095
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2343043
Commit-Queue: Fritz Koenig <frkoenig@chromium.org>
Reviewed-by: Chih-Yu Huang <akahuang@chromium.org>
Reviewed-by: Andres Calderon Jaramillo <andrescj@chromium.org>
Reviewed-by: Dale Curtis <dalecurtis@chromium.org>
Cr-Commit-Position: refs/heads/master@{#802707}