Roll src/third_party/dawn aa9d6ad09d0d..b6a80b321e8f (1 commits)

https://dawn.googlesource.com/dawn.git/+log/aa9d6ad09d0d..b6a80b321e8f


git log aa9d6ad09d0d..b6a80b321e8f --date=short --no-merges --format='%ad %ae %s'
2019-03-07 natlee@microsoft.com Destroy backend implementation for Buffers


Created with:
  gclient setdep -r src/third_party/dawn@b6a80b321e8f

The AutoRoll server is located here: https://autoroll.skia.org/r/dawn-chromium-autoroll

Documentation for the AutoRoller is here:
https://skia.googlesource.com/buildbot/+/master/autoroll/README.md

If the roll is causing failures, please contact the current sheriff, who should
be CC'd on the roll, and stop the roller if necessary.

CQ_INCLUDE_TRYBOTS=luci.chromium.try:linux_optional_gpu_tests_rel;luci.chromium.try:mac_optional_gpu_tests_rel;luci.chromium.try:win_optional_gpu_tests_rel
TBR=cwallez@chromium.org

Change-Id: I1f4ecec1abd2e57d8aae5f707da4eed55c8355d2
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1509257Reviewed-by: chromium-autoroll <chromium-autoroll@skia-public.iam.gserviceaccount.com>
Commit-Queue: chromium-autoroll <chromium-autoroll@skia-public.iam.gserviceaccount.com>
Cr-Commit-Position: refs/heads/master@{#638753}

DEPS

@@ -260,7 +260,7 @@ vars = {
   # Three lines of non-changing comments so that
   # the commit queue can handle CLs rolling feed
   # and whatever else without interference from each other.
-  'dawn_revision': 'aa9d6ad09d0d43ad2a35263fb45c272f40f95937',
+  'dawn_revision': 'b6a80b321e8fa0b79d9a947656ea0ad649ed5a3c',
   # Three lines of non-changing comments so that
   # the commit queue can handle CLs rolling feed
   # and whatever else without interference from each other.