Roll src/third_party/angle a4a42e6d0baa..cb9a86a9d867 (1 commits)

https://chromium.googlesource.com/angle/angle.git/+log/a4a42e6d0baa..cb9a86a9d867

git log a4a42e6d0baa..cb9a86a9d867 --date=short --first-parent --format='%ad %ae %s'
2020-03-15 ynovikov@chromium.org Skip SwANGLE GLES31 tests which crash with 32-bit Subzero.

Created with:
  gclient setdep -r src/third_party/angle@cb9a86a9d867

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 jmadill@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/+/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
Bug: None
Tbr: jmadill@google.com
Change-Id: Ifc12641bb8fcc30402b841874ed2a9ce2b4c62aa
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2103666Reviewed-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@{#750461}

DEPS

@@ -187,7 +187,7 @@ 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': 'a4a42e6d0baa6ff99eb9e66115044b46280bcc7f',
+  'angle_revision': 'cb9a86a9d8677909988c83ab4076287a96b4d513',
   # Three lines of non-changing comments so that
   # the commit queue can handle CLs rolling SwiftShader
   # and whatever else without interference from each other.