When using a transfer destination, we should be using the transfer
access mask, not bottom of pipe or other bits.

Uncovered by using a newer version of the layers SDK.

BUG=angleproject:2237

Change-Id: I3ebcca707ac8889d2ece099e3765f5b0ca3dfdbc
Reviewed-on: https://chromium-review.googlesource.com/760636Reviewed-by: Corentin Wallez <cwallez@chromium.org>
Reviewed-by: Frank Henigman <fjhenigman@chromium.org>
Commit-Queue: Jamie Madill <jmadill@chromium.org>