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Destroying a transfer buffer now requires only an ordering barrier, not
a full flush. This removes a source of unnecessary flushes and makes
resizing the transfer buffer more efficient.

Bug: 850271, 835353, 828363
Cq-Include-Trybots: luci.chromium.try:android_optional_gpu_tests_rel;luci.chromium.try:linux_optional_gpu_tests_rel;luci.chromium.try:mac_optional_gpu_tests_rel;luci.chromium.try:win_optional_gpu_tests_rel
Change-Id: I9bfe43c46c00f8e9fc29e6450da788f86e74bc52
Reviewed-on: https://chromium-review.googlesource.com/1093580Reviewed-by: Robert Sesek <rsesek@chromium.org>
Reviewed-by: Antoine Labour <piman@chromium.org>
Reviewed-by: Sunny Sachanandani <sunnyps@chromium.org>
Commit-Queue: James Darpinian <jdarpinian@chromium.org>
Cr-Commit-Position: refs/heads/master@{#567494}