Roll Dawn from 762814bd9229 to ef869c2d01d5 (2 revisions)

https://dawn.googlesource.com/dawn.git/+log/762814bd9229..ef869c2d01d5

2021-01-21 cwallez@chromium.org Use SubresourceStorage to track per-subresource state.
2021-01-21 cwallez@chromium.org EnumMaskIterator: ASSERT when the mask is too big.

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 sarahmashay@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: sarahmashay@google.com
Change-Id: I1ebdd3a7101b9e5f77299c653a6cfa4313ffe699
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2642171Reviewed-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@{#845608}

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': '762814bd922932d3d9da9b220463b6ce5f167d76',
+  'dawn_revision': 'ef869c2d01d5241ba8d16e6863e8595bc1fac9fd',
   # Three lines of non-changing comments so that
   # the commit queue can handle CLs rolling feed
   # and whatever else without interference from each other.