Roll src/third_party/angle a60e49738bf1..8c6e40d2264e (1 commits)

https://chromium.googlesource.com/angle/angle.git/+log/a60e49738bf1..8c6e40d2264e

git log a60e49738bf1..8c6e40d2264e --date=short --first-parent --format='%ad %ae %s'
2020-02-28 angle-autoroll@skia-public.iam.gserviceaccount.com Roll third_party/SwiftShader 4b34ee3de531..05f5e0b34ac8 (2 commits)

Created with:
  gclient setdep -r src/third_party/angle@8c6e40d2264e

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 geofflang@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: geofflang@google.com
Change-Id: Ibcd5f95af06848e07a143307576cf4d0061d5eb5
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2080044Reviewed-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@{#745399}

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': 'a60e49738bf11f568b018f561298ba448988a4b8',
+  'angle_revision': '8c6e40d2264e70a29df3b79e411212804b96a29d',
   # Three lines of non-changing comments so that
   # the commit queue can handle CLs rolling SwiftShader
   # and whatever else without interference from each other.