Roll Tint from 8144af91b4f9 to 1d9935cf37fd (9 revisions)

https://dawn.googlesource.com/tint.git/+log/8144af91b4f9..1d9935cf37fd

2021-01-11 rharrison@chromium.org Revert 3 fuzzing CLs, since they are preventing rolling into Chromium.
2021-01-11 dsinclair@chromium.org Convert ScopeStack over to symbols.
2021-01-11 dneto@google.com spirv-reader: Reject dref sampling with Bias or Grad
2021-01-08 dneto@google.com Roll third party dependencies
2021-01-08 dneto@google.com spirv-reader: rename variable
2021-01-08 rharrison@chromium.org Adding fuzzing for Transforms
2021-01-07 rharrison@chromium.org Add fuzzers for various emission paths
2021-01-07 rharrison@chromium.org Create common utility class for fuzzing
2021-01-07 bclayton@google.com Add tool to check the WGSL spec examples compile

If this roll has caused a breakage, revert this CL and stop the roller
using the controls here:
https://autoroll.skia.org/r/tint-chromium-autoroll
Please CC dsinclair@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: dsinclair@google.com
Change-Id: I57e6941520001e04b1436eb03dc915818e6a6b05
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2621880Reviewed-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@{#842093}

DEPS

@@ -353,7 +353,7 @@ vars = {
   'ukey2_revision': '0275885d8e6038c39b8a8ca55e75d1d4d1727f47',
   # the commit queue can handle CLs rolling feed
   # and whatever else without interference from each other.
-  'tint_revision': '8144af91b4f901b5083b168c6600f4b0f3947d80',
+  'tint_revision': '1d9935cf37fdd1b9eb18f3e41d6142a345bba4a6',
 
   # TODO(crbug.com/941824): The values below need to be kept in sync
   # between //DEPS and //buildtools/DEPS, so if you're updating one,