Roll Tint from 4226b6a1d8bf to 2abecbba1670 (8 revisions)

https://dawn.googlesource.com/tint.git/+log/4226b6a1d8bf..2abecbba1670

2020-12-12 bclayton@google.com Always emit coverage, even if the exe returns non-zero
2020-12-12 bclayton@google.com ast: Remove no-arg constructor from Node
2020-12-12 bclayton@google.com ast: Remove Struct constructors that don't take a Source
2020-12-12 bclayton@google.com ast: Remove StructMember constructor that doesn't take a Source
2020-12-12 bclayton@google.com ast: Remove statement constructors that don't take a Source
2020-12-12 bclayton@google.com ast: Remove expression constructors that don't take a Source
2020-12-12 bclayton@google.com ast: Add Source argument to literals
2020-12-12 bclayton@google.com ast: Remove Node::set_source()

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 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: I2a72f525a18c39e91722d84479738dd2514bcfcc
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2587717Reviewed-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@{#836462}

DEPS

@@ -365,7 +365,7 @@ vars = {
   'ukey2_revision': '0275885d8e6038c39b8a8ca55e75d1d4d1727f47',
   # the commit queue can handle CLs rolling feed
   # and whatever else without interference from each other.
-  'tint_revision': '4226b6a1d8bfa4add00f199c54a2c6d726a3ca57',
+  'tint_revision': '2abecbba167074d667e44ac66ee3989bd991de08',
 
   # TODO(crbug.com/941824): The values below need to be kept in sync
   # between //DEPS and //buildtools/DEPS, so if you're updating one,