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The queue's support is currently checked in the video decoder but the
queue should be responsible to check whether it does support requests or not.
This patch moves the check for the request support to the V4L2Queue
constructor.

BUG=chromium:1009921
TEST=ran tast with video.DecodeAccelVD.vp8_resolution_switch on veyron_minnie.
TEST=ran tast with video.DecodeAccelVD.h264_resolution_switch on veyron_minnie.
TEST=ran tast with video.DecodeAccelVD.vp8 on veyron_minnie.
TEST=ran tast with video.DecodeAccelVD.h264 on veyron_minnie.
TEST=ran tast with video.DecodeAccelVD.vp8_resolution_switch on kevin.
TEST=ran tast with video.DecodeAccelVD.h264_resolution_switch on kevin.
TEST=ran tast with video.DecodeAccelVD.vp8 on kevin.
TEST=ran tast with video.DecodeAccelVD.h264 on kevin.
TEST=ran video_decode_accelerator_tests w/ vp8 & h264 videos but w/o VD on kevin.
Signed-off-by: Francois Buergisser <fbuergisser@chromium.org>
Change-Id: I8c7559f2e84e0ed0690ba439e121e8b07154ed45
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1950048Reviewed-by: Alexandre Courbot <acourbot@chromium.org>
Commit-Queue: Alexandre Courbot <acourbot@chromium.org>
Cr-Commit-Position: refs/heads/master@{#730059}