Roll ANGLE from 198dc345383e to b421774ae9c3 (1 revision)

https://chromium.googlesource.com/angle/angle.git/+log/198dc345383e..b421774ae9c3

2021-01-14 angle-autoroll@skia-public.iam.gserviceaccount.com Roll Chromium from 451c64aa to fabc0b0b (518 revisions)

If this roll has caused a breakage, revert this CL and stop the roller
using the controls here:
https://autoroll.skia.org/r/angle-chromium-autoroll
Please CC timvp@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_optional_gpu_tests_rel;luci.chromium.try:mac_optional_gpu_tests_rel;luci.chromium.try:win-asan;luci.chromium.try:win_optional_gpu_tests_rel;luci.chromium.try:linux-swangle-try-x64;luci.chromium.try:win-swangle-try-x86
Bug: None
Tbr: timvp@google.com
Change-Id: I61d4c6df7b13831d564fdf4daec1572761b41b0e
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2629028Reviewed-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@{#843492}

DEPS

@@ -211,7 +211,7 @@ vars = {
   # Three lines of non-changing comments so that
   # the commit queue can handle CLs rolling ANGLE
   # and whatever else without interference from each other.
-  'angle_revision': '198dc345383e1f17252945bdb4a6dd47f4345ad4',
+  'angle_revision': 'b421774ae9c3a78ca833a506ce1ea3baa01c3bbe',
   # Three lines of non-changing comments so that
   # the commit queue can handle CLs rolling SwiftShader
   # and whatever else without interference from each other.