Roll ANGLE from bc53046b29f8 to 121d985642fd (3 revisions)

https://chromium.googlesource.com/angle/angle.git/+log/bc53046b29f8..121d985642fd

2020-09-02 angle-autoroll@skia-public.iam.gserviceaccount.com Roll Chromium from 86334243 to 09df13c2 (356 revisions)
2020-09-02 angle-autoroll@skia-public.iam.gserviceaccount.com Roll Vulkan-ValidationLayers from f1315472247d to b0337a548273 (2 revisions)
2020-09-02 angle-autoroll@skia-public.iam.gserviceaccount.com Roll SPIRV-Tools from 8a0ebd40f86d to c278dada96d9 (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/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: I8ca08b0592b867a2f05c316a855b28af655d5323
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2390041Reviewed-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@{#803853}

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': 'bc53046b29f8bb4c94213318cad9ffcfada04ae0',
+  'angle_revision': '121d985642fd5599e95221f70140dc5df4137bdb',
   # Three lines of non-changing comments so that
   # the commit queue can handle CLs rolling SwiftShader
   # and whatever else without interference from each other.