Roll third_party/externals/angle2 6aca71d7d705..6d653c02dd24 (4 commits)
Roll third_party/externals/angle2 6aca71d7d705..6d653c02dd24 (4 commits)

https://chromium.googlesource.com/angle/angle.git/+log/6aca71d7d705..6d653c02dd24

git log 6aca71d7d705..6d653c02dd24 --date=short --no-merges --format='%ad %ae %s'
2019-08-21 hckim.kim@samsung.com Vulkan: Set empty buffer to xfb descriptor set as an initial buffer
2019-08-20 jonahr@google.com Autogenerated kFunction* variables detected as mutable constants
2019-08-20 clemendeng@google.com Get rid of gl_ViewID_OVR for ESSL1
2019-08-20 lujc@google.com Separate dirty bit for attrib's binding VBO change

Created with:
  gclient setdep -r third_party/externals/angle2@6d653c02dd24

The AutoRoll server is located here: https://autoroll.skia.org/r/angle-skia-autoroll

Documentation for the AutoRoller is here:
https://skia.googlesource.com/buildbot/+/master/autoroll/README.md

If the roll is causing failures, please contact the current sheriff, who should
be CC'd on the roll, and stop the roller if necessary.


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=egdaniel@google.com
Change-Id: I330307a5d25a8bf6c5f99a668e9a7d774fc5232d
Reviewed-on: https://skia-review.googlesource.com/c/skia/+/236017
Reviewed-by: skia-autoroll <e034c62197df5622a9c1bef8b3e012f87a0a9840@skia-public.iam.gserviceaccount.com>
Commit-Queue: skia-autoroll <e034c62197df5622a9c1bef8b3e012f87a0a9840@skia-public.iam.gserviceaccount.com>

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