Roll Skia from 821a84558bd4 to 3c142940b9dd (2 revisions)

https://skia.googlesource.com/skia.git/+log/821a84558bd4..3c142940b9dd

2021-01-21 skia-autoroll@skia-public.iam.gserviceaccount.com Roll Dawn from 311a17a8feae to 762814bd9229 (7 revisions)
2021-01-21 skia-autoroll@skia-public.iam.gserviceaccount.com Roll SwiftShader from 89fd1480b47e to b3e5c440d239 (5 revisions)

If this roll has caused a breakage, revert this CL and stop the roller
using the controls here:
https://autoroll.skia.org/r/skia-autoroll
Please CC scroggo@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:android_optional_gpu_tests_rel;luci.chromium.try:linux-blink-rel;luci.chromium.try:linux-chromeos-compile-dbg;luci.chromium.try:linux_optional_gpu_tests_rel;luci.chromium.try:mac_optional_gpu_tests_rel;luci.chromium.try:win_optional_gpu_tests_rel
Cq-Do-Not-Cancel-Tryjobs: true
Bug: None
Tbr: scroggo@google.com
Change-Id: I0b05fe93dd42dc6a98f308619bfa28099785b7d6
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2641481Reviewed-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@{#845543}

DEPS

@@ -199,7 +199,7 @@ vars = {
   # Three lines of non-changing comments so that
   # the commit queue can handle CLs rolling Skia
   # and whatever else without interference from each other.
-  'skia_revision': '821a84558bd40fe0c73ed0c15a400372bbbbe51d',
+  'skia_revision': '3c142940b9ddaf3c946ccc280c46fc07d472847a',
   # Three lines of non-changing comments so that
   # the commit queue can handle CLs rolling V8
   # and whatever else without interference from each other.