Roll third_party/externals/angle2 21c5af3151fb..3cb9c4bee9b3 (7 commits)

https://chromium.googlesource.com/angle/angle.git/+log/21c5af3151fb..3cb9c4bee9b3

git log 21c5af3151fb..3cb9c4bee9b3 --date=short --first-parent --format='%ad %ae %s'
2020-04-24 jonahr@google.com Statically link vulkan-loader on Mac
2020-04-24 jmadill@chromium.org Vulkan: Clean up ClipRectToScissor.
2020-04-24 jmadill@chromium.org Vulkan: Remove unicode character from error string.
2020-04-24 angle-autoroll@skia-public.iam.gserviceaccount.com Roll third_party/SwiftShader 5ab1f36a38aa..f42c698d784a (8 commits)
2020-04-24 angle-autoroll@skia-public.iam.gserviceaccount.com Roll third_party/spirv-tools/src 67f4838659f4..5547553a0c7b (2 commits)
2020-04-24 angle-autoroll@skia-public.iam.gserviceaccount.com Roll third_party/vulkan-validation-layers/src 260a7c82e988..bb0380e3932a (3 commits)
2020-04-24 angle-autoroll@skia-public.iam.gserviceaccount.com Roll third_party/vulkan-headers/src 382bf3de06fc..62becc509a88 (1 commits)

Created with:
  gclient setdep -r third_party/externals/angle2@3cb9c4bee9b3

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 ethannicholas@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/skia.primary:Build-Debian10-Clang-x86_64-Release-ANGLE;skia/skia.primary:Test-Win10-Clang-AlphaR2-GPU-RadeonR9M470X-x86_64-Debug-All-ANGLE;skia/skia.primary:Test-Win10-Clang-Golo-GPU-QuadroP400-x86_64-Debug-All-ANGLE;skia/skia.primary:Test-Win10-Clang-NUC5i7RYH-GPU-IntelIris6100-x86_64-Debug-All-ANGLE;skia/skia.primary:Test-Win10-Clang-NUC6i5SYK-GPU-IntelIris540-x86_64-Debug-All-ANGLE;skia/skia.primary:Test-Win10-Clang-NUC8i5BEK-GPU-IntelIris655-x86_64-Debug-All-ANGLE;skia/skia.primary:Test-Win10-Clang-NUCD34010WYKH-GPU-IntelHD4400-x86_64-Debug-All-ANGLE
Bug: None
Tbr: ethannicholas@google.com
Change-Id: Ie8394456da60680b31d1b71d16372744eda63a13
Reviewed-on: https://skia-review.googlesource.com/c/skia/+/285601
Reviewed-by: skia-autoroll <skia-autoroll@skia-public.iam.gserviceaccount.com>
Commit-Queue: skia-autoroll <skia-autoroll@skia-public.iam.gserviceaccount.com>
1 file changed