Roll third_party/externals/angle2 a1bf69967a32..0c35e0f44dbd (5 commits)
Roll third_party/externals/angle2 a1bf69967a32..0c35e0f44dbd (5 commits)

https://chromium.googlesource.com/angle/angle.git/+log/a1bf69967a32..0c35e0f44dbd

git log a1bf69967a32..0c35e0f44dbd --date=short --no-merges --format='%ad %ae %s'
2019-09-05 b.schade@samsung.com Add null default backend environment variable option
2019-09-04 mihu@microsoft.com GL_EXT_multisampled_render_to_texture extension. Part 1.
2019-09-04 courtneygo@google.com Vulkan: fix unsized internalformat depth sampling
2019-09-04 jmadill@chromium.org Remove overlay font hash from codegen.
2019-09-04 angle-autoroll@skia-public.iam.gserviceaccount.com Roll ./third_party/spirv-tools/src 2c5ed16ba97d..9b3cc3e05337 (5 commits)

Created with:
  gclient setdep -r third_party/externals/angle2@0c35e0f44dbd

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: Ic2b97b954d59957486cc8d8e0aca2eb0dce11295
Reviewed-on: https://skia-review.googlesource.com/c/skia/+/239396
Reviewed-by: skia-autoroll <e034c62197df5622a9c1bef8b3e012f87a0a9840@skia-public.iam.gserviceaccount.com>
Commit-Queue: skia-autoroll <e034c62197df5622a9c1bef8b3e012f87a0a9840@skia-public.iam.gserviceaccount.com>

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