Roll Dawn from 4099f6552592 to ac3765e663cd (2 revisions)

https://dawn.googlesource.com/dawn.git/+log/4099f6552592..ac3765e663cd

2020-09-17 bryan.bernhart@intel.com D3D12: Align UBO sizes to 256B.
2020-09-17 rharrison@chromium.org Enable running robust buffer access pass on shaders

If this roll has caused a breakage, revert this CL and stop the roller
using the controls here:
https://autoroll.skia.org/r/dawn-chromium-autoroll
Please CC cwallez@google.com on the revert to ensure that a human
is aware of the problem.

To report a problem with the AutoRoller itself, please file a bug:
https://bugs.chromium.org/p/skia/issues/entry?template=Autoroller+Bug

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

Cq-Include-Trybots: luci.chromium.try:dawn-linux-x64-deps-rel;luci.chromium.try:dawn-mac-x64-deps-rel;luci.chromium.try:dawn-win10-x64-deps-rel;luci.chromium.try:dawn-win10-x86-deps-rel
Bug: None
Tbr: cwallez@google.com
Change-Id: Iefcdeef10c5e88a4e3ef942db17ab2afc847fb15
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2417599Reviewed-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@{#808198}

DEPS

@@ -318,7 +318,7 @@ 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': '4099f6552592575360ad630e5c00e4978335f89d',
+  'dawn_revision': 'ac3765e663cd6569edbc9a219fe19f0df8e09aae',
   # Three lines of non-changing comments so that
   # the commit queue can handle CLs rolling feed
   # and whatever else without interference from each other.