Roll third_party/externals/angle2 31b524cf60b7..a1bf69967a32 (8 commits)
Roll third_party/externals/angle2 31b524cf60b7..a1bf69967a32 (8 commits)

https://chromium.googlesource.com/angle/angle.git/+log/31b524cf60b7..a1bf69967a32

git log 31b524cf60b7..a1bf69967a32 --date=short --no-merges --format='%ad %ae %s'
2019-09-04 teisenbe@google.com Fuchsia: Migrate to new libasync-loop API
2019-09-03 lujc@google.com Use TransformFeedbackID in place of GLuint handle
2019-09-03 lujc@google.com Use VertexArrayID in place of GLuint handle
2019-09-03 syoussefi@chromium.org Reland "Vulkan: Debug overlay"
2019-09-03 mihu@microsoft.com ANGLE test fixture leaking.
2019-09-03 syoussefi@chromium.org Update status of ES3.1 on Vulkan
2019-09-03 angle-autoroll@skia-public.iam.gserviceaccount.com Roll ./third_party/glslang/src 92f5afdee0ab..56f61ccceffa (1 commits)
2019-09-03 angle-autoroll@skia-public.iam.gserviceaccount.com Roll ./third_party/spirv-tools/src 65e362b7ae2a..2c5ed16ba97d (1 commits)

Created with:
  gclient setdep -r third_party/externals/angle2@a1bf69967a32

If this roll has caused a breakage, revert this CL and stop the roller
using the controls here:
https://autoroll.skia.org/r/angle-skia-autoroll
Please CC jlavrova@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=skia.primary:Build-Debian9-Clang-x86_64-Release-ANGLE;skia.primary:Test-Win10-Clang-AlphaR2-GPU-RadeonR9M470X-x86_64-Debug-All-ANGLE;skia.primary:Test-Win10-Clang-Golo-GPU-QuadroP400-x86_64-Debug-All-ANGLE;skia.primary:Test-Win10-Clang-NUC5i7RYH-GPU-IntelIris6100-x86_64-Debug-All-ANGLE;skia.primary:Test-Win10-Clang-NUC6i5SYK-GPU-IntelIris540-x86_64-Debug-All-ANGLE;skia.primary:Test-Win10-Clang-NUC8i5BEK-GPU-IntelIris655-x86_64-Debug-All-ANGLE;skia.primary:Test-Win10-Clang-NUCD34010WYKH-GPU-IntelHD4400-x86_64-Debug-All-ANGLE
Bug: None
TBR=jlavrova@google.com
Change-Id: I9a49cd5e7bb2edc5ad58004cc95d9e12738c554d
Reviewed-on: https://skia-review.googlesource.com/c/skia/+/239028
Reviewed-by: skia-autoroll <e034c62197df5622a9c1bef8b3e012f87a0a9840@skia-public.iam.gserviceaccount.com>
Commit-Queue: skia-autoroll <e034c62197df5622a9c1bef8b3e012f87a0a9840@skia-public.iam.gserviceaccount.com>

HalCanary/skia-hc,google/skia,aosp-mirror/platform_external_skia,google/skia,HalCanary/skia-hc,HalCanary/skia-hc,google/skia,aosp-mirror/platform_external_skia,aosp-mirror/platform_external_skia,google/skia,HalCanary/skia-hc,HalCanary/skia-hc,HalCanary/skia-hc,google/skia,HalCanary/skia-hc,google/skia,aosp-mirror/platform_external_skia,google/skia,aosp-mirror/platform_external_skia,HalCanary/skia-hc,aosp-mirror/platform_external_skia,google/skia,HalCanary/skia-hc,google/skia,aosp-mirror/platform_external_skia,HalCanary/skia-hc,aosp-mirror/platform_external_skia,aosp-mirror/platform_external_skia,google/skia,aosp-mirror/platform_external_skia