Roll Tint from 89042538376b to 7156d3e3140b (2 revisions)

https://dawn.googlesource.com/tint.git/+log/89042538376b..7156d3e3140b

2020-10-19 dsinclair@chromium.org [wgsl-reader] Add parsing of named structs.
2020-10-19 dsinclair@chromium.org Roll Tint dependencies

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

Bug: None
Tbr: dsinclair@google.com
Change-Id: I00a603b6f01a65c5bc522d8bec8b0d9c82b718b1
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2485591Reviewed-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@{#818543}

DEPS

@@ -368,7 +368,7 @@ vars = {
   'ukey2_revision': '0275885d8e6038c39b8a8ca55e75d1d4d1727f47',
   # the commit queue can handle CLs rolling feed
   # and whatever else without interference from each other.
-  'tint_revision': '89042538376b59419d2b9d53c2e716ab1f1cf8d5',
+  'tint_revision': '7156d3e3140b361c34503e518fa078bd0189981f',
 
   # TODO(crbug.com/941824): The values below need to be kept in sync
   # between //DEPS and //buildtools/DEPS, so if you're updating one,