Roll ANGLE from 527064f19fb0 to a2d9abef043b (3 revisions)

https://chromium.googlesource.com/angle/angle.git/+log/527064f19fb0..a2d9abef043b

2020-10-02 m.maiya@samsung.com Vulkan: Add OES_sample_shading extension entry points
2020-10-02 j.vigil@samsung.com EGL: Add stencil8 to configs
2020-10-02 syoussefi@chromium.org Vulkan: Fix unresolve disagreement between FB and RP

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 jonahr@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: jonahr@google.com
Test: Test: angle_deqp_egl_tests
Change-Id: Ib580f693bbd6403e575d784422a98c584fc09e5d
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2446583Reviewed-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@{#813346}

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': '527064f19fb0d29e90ce0d69b07bbdb8533b3a58',
+  'angle_revision': 'a2d9abef043b3eb44798241983d63785a9aad6fc',
   # Three lines of non-changing comments so that
   # the commit queue can handle CLs rolling SwiftShader
   # and whatever else without interference from each other.