Roll Dawn from ee977a0df8e3 to 64c5d601f89b (2 revisions)

https://dawn.googlesource.com/dawn.git/+log/ee977a0df8e3..64c5d601f89b

2020-12-17 enga@chromium.org Update ComputeStorageBufferBarrierTests to use WGSL
2020-12-17 enga@chromium.org Update DynamicBufferOffsetTests to use WGSL

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 rharrison@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: rharrison@google.com
Change-Id: I318647264712f4b8659c30cb6965ba8ff207f6b6
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2598157Reviewed-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@{#838435}

DEPS

@@ -314,7 +314,7 @@ 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': 'ee977a0df8e3f3a12a6f2983db98838bf65566da',
+  'dawn_revision': '64c5d601f89b7733091222796ff3631668fb2c25',
   # Three lines of non-changing comments so that
   # the commit queue can handle CLs rolling feed
   # and whatever else without interference from each other.