Roll ANGLE from c0dda02196e8 to c21fdb07d60c (4 revisions)

https://chromium.googlesource.com/angle/angle.git/+log/c0dda02196e8..c21fdb07d60c

2020-09-01 angle-autoroll@skia-public.iam.gserviceaccount.com Roll Chromium from 1ca2f943 to 86334243 (403 revisions)
2020-09-01 angle-autoroll@skia-public.iam.gserviceaccount.com Roll SPIRV-Tools from f428aa39ca2b to 8a0ebd40f86d (1 revision)
2020-09-01 angle-autoroll@skia-public.iam.gserviceaccount.com Roll Vulkan-ValidationLayers from 0e98e894a84c to f1315472247d (2 revisions)
2020-09-01 angle-autoroll@skia-public.iam.gserviceaccount.com Roll Vulkan-Tools from 1b0bbd1550ed to 25d277579d1e (1 revision)

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 cwallez@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: cwallez@google.com
Change-Id: Iad395065e7488770da0e43cbfb62fbed08597c52
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2387446Reviewed-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@{#803463}

DEPS

@@ -207,7 +207,7 @@ 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': 'c0dda02196e838fcfbd265c7063014d86d1c2564',
+  'angle_revision': 'c21fdb07d60c31e961751cf701a554a1589ce9df',
   # Three lines of non-changing comments so that
   # the commit queue can handle CLs rolling SwiftShader
   # and whatever else without interference from each other.