Roll ANGLE from c75473c2cf88 to a77bc1f1e690 (3 revisions)

https://chromium.googlesource.com/angle/angle.git/+log/c75473c2cf88..a77bc1f1e690

2020-12-11 angle-autoroll@skia-public.iam.gserviceaccount.com Roll SwiftShader from d94a77b304f4 to 0a64a9747555 (3 revisions)
2020-12-11 angle-autoroll@skia-public.iam.gserviceaccount.com Roll Chromium from 2db43e77 to 0c234289 (451 revisions)
2020-12-11 syoussefi@chromium.org Add a scissored MSRTT test

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 syoussefi@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: syoussefi@google.com
Change-Id: I0095535ec623ec07e4f1a2ecbd1a3cab4162740d
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2586897Reviewed-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@{#836092}

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': 'c75473c2cf88b8068d77f2da4710c87aa08e06f9',
+  'angle_revision': 'a77bc1f1e69056a533af0911d590538ae8900cdd',
   # Three lines of non-changing comments so that
   # the commit queue can handle CLs rolling SwiftShader
   # and whatever else without interference from each other.