Roll ANGLE from 8d09e37670ed to 8138cbbd875a (2 revisions)

https://chromium.googlesource.com/angle/angle.git/+log/8d09e37670ed..8138cbbd875a

2020-07-30 angle-autoroll@skia-public.iam.gserviceaccount.com Roll SwiftShader from dc8e77f0e521 to 08a3cc4cfbaa (3 revisions)
2020-07-30 angle-autoroll@skia-public.iam.gserviceaccount.com Roll Vulkan-ValidationLayers from c0bf676837e4 to 4400cab64b22 (7 revisions)

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 tobine@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: tobine@google.com
Change-Id: I55d6d9d4c826e575339b27cd76e32939ac7b72dd
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2328759Reviewed-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@{#793163}

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': '8d09e37670ed29e77cd62428bd3af0c339bb0dd2',
+  'angle_revision': '8138cbbd875a6aa9b7daa4a4e6d2b83aecf9b310',
   # Three lines of non-changing comments so that
   # the commit queue can handle CLs rolling SwiftShader
   # and whatever else without interference from each other.