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A VideoFrame mapped by the VaapiDmabufVideoFrameMapper holds a VAImage created
from the source VideoFrame. The VA surface associated the source video frame
should not be released until the mapped video frame is destroyed, so we bind a
reference to the source video frame to the mapped video frame's destructor.

Bug: 1020776
Test: VD test on atlas
Change-Id: Ia0b01b4bcb3e4312c0c2e91f8ad8c8beae20f393
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1911342
Commit-Queue: Hirokazu Honda <hiroh@chromium.org>
Reviewed-by: David Staessens <dstaessens@chromium.org>
Cr-Commit-Position: refs/heads/master@{#714807}