Roll skia/third_party/externals/angle2/ a98a28112..3acfc6255 (1 commit)

https://chromium.googlesource.com/angle/angle.git/+log/a98a28112b0e..3acfc6255c56

$ git log a98a28112..3acfc6255 --date=short --no-merges --format='%ad %ae %s'
2017-12-12 cwallez Add test for Chromium's EGL_D3D_TEXTURE pbuffer creation

Created with:
  roll-dep skia/third_party/externals/angle2
BUG=794086


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

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
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CQ_INCLUDE_TRYBOTS=skia.primary:Perf-Win10-Clang-AlphaR2-GPU-RadeonR9M470X-x86_64-Debug-All-ANGLE,Perf-Win10-Clang-NUC5i7RYH-GPU-IntelIris6100-x86_64-Debug-All-ANGLE,Perf-Win10-Clang-NUC6i5SYK-GPU-IntelIris540-x86_64-Debug-All-ANGLE,Perf-Win10-Clang-NUCD34010WYKH-GPU-IntelHD4400-x86_64-Debug-All-ANGLE,Perf-Win10-Clang-ShuttleC-GPU-GTX960-x86_64-Debug-All-ANGLE,Test-Win10-Clang-AlphaR2-GPU-RadeonR9M470X-x86_64-Debug-All-ANGLE,Test-Win10-Clang-NUC6i5SYK-GPU-IntelIris540-x86_64-Debug-All-ANGLE,Test-Win10-Clang-NUCD34010WYKH-GPU-IntelHD4400-x86_64-Debug-All-ANGLE,Test-Win10-Clang-ShuttleC-GPU-GTX960-x86_64-Debug-All-ANGLE,Build-Debian9-Clang-x86_64-Release-ANGLE
TBR=liyuqian@google.com

Change-Id: I72e46a888d8b9e12d7342db92e6851a74e0bf48c
Reviewed-on: https://skia-review.googlesource.com/84168
Reviewed-by: angle-deps-roller . <angle-deps-roller@chromium.org>
Commit-Queue: angle-deps-roller . <angle-deps-roller@chromium.org>