Roll ANGLE from a2d9abef043b to c488f0c909e2 (6 revisions)

https://chromium.googlesource.com/angle/angle.git/+log/a2d9abef043b..c488f0c909e2

2020-10-02 jmadill@chromium.org Suppress flaky test on Win/Intel/GL.
2020-10-02 vantablack@google.com First pass at increasing inclusivity
2020-10-02 j.vigil@samsung.com Implement GL_OES_texture_stencil8
2020-10-02 jmadill@chromium.org Disable AMD OpenGL testing on Windows ANGLE tests.
2020-10-02 cclao@google.com Vulkan: Add a test and fix the bug with draw/invalidate/clear
2020-10-02 jmadill@chromium.org Skip ResizeWindowWithDraw test on all Linux.

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: chromium:1097198
Tbr: jonahr@google.com
Test: Test: angle_deqp_egl_tests
Change-Id: Ifc582e7ac5d4b95be03d4637bac147332970f54c
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2446917Reviewed-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@{#813432}

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': 'a2d9abef043b3eb44798241983d63785a9aad6fc',
+  'angle_revision': 'c488f0c909e256c68962c3f098199228696aaef1',
   # Three lines of non-changing comments so that
   # the commit queue can handle CLs rolling SwiftShader
   # and whatever else without interference from each other.