Roll ANGLE from 215834139a79 to 47e9aed2af83 (4 revisions)

https://chromium.googlesource.com/angle/angle.git/+log/215834139a79..47e9aed2af83

2021-01-13 jmadill@chromium.org Remove Sleep() from PrimitivesWrittenAndGenerated test.
2021-01-13 jmadill@chromium.org infra: Fixes for config.
2021-01-13 jwata@google.com Use CAS in scripts/trigger.py
2021-01-13 jmadill@chromium.org Add configuration for trace test bots.

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 timvp@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:1163817
Tbr: timvp@google.com
Change-Id: I7f6682381a1110ea73c5e4e219695c247fe4c74a
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2627869Reviewed-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@{#843192}

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': '215834139a79c03f66e48785a5d741be4e08c5cd',
+  'angle_revision': '47e9aed2af83c0c3f684a804156c3b876a58a1bf',
   # Three lines of non-changing comments so that
   # the commit queue can handle CLs rolling SwiftShader
   # and whatever else without interference from each other.