Roll ANGLE from e59d8716b300 to a13f6847238e (2 revisions)

https://chromium.googlesource.com/angle/angle.git/+log/e59d8716b300..a13f6847238e

2020-12-08 angle-autoroll@skia-public.iam.gserviceaccount.com Roll Chromium from bbe26af2 to a3984b7e (468 revisions)
2020-12-08 syoussefi@chromium.org Suppress flaky multithreading swiftshader 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: I12ee3f84b478a59d567fdceb8d157892f08ed5f0
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2578780Reviewed-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@{#834661}

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': 'e59d8716b300902259f1cef7992eddc2444a7d6f',
+  'angle_revision': 'a13f6847238e7e74fcb9a81caeb810800c8a8fef',
   # Three lines of non-changing comments so that
   # the commit queue can handle CLs rolling SwiftShader
   # and whatever else without interference from each other.