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This CL adds some CHECKs to assert that duping dma-buf FDs is
successful. See referenced bug for more details.

Bug: 1097956
Test: None
Change-Id: I766a8729cf34635892c69b297f4b09b2d8a9c471
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2366293Reviewed-by: Miguel Casas <mcasas@chromium.org>
Reviewed-by: Jorge Lucangeli Obes <jorgelo@chromium.org>
Commit-Queue: Andres Calderon Jaramillo <andrescj@chromium.org>
Cr-Commit-Position: refs/heads/master@{#800729}