Roll third_party/externals/angle2 a47e2a2..518c679 (3 commits)

https://chromium.googlesource.com/angle/angle.git/+log/a47e2a23ab4c..518c679da109


git log a47e2a2..518c679 --date=short --no-merges --format='%ad %ae %s'
2019-03-26 jonahr@google.com Clean up test_expectations to merge with angle style/convention.
2019-03-26 syoussefi@chromium.org Fix OOM in TextureUpload perf test
2019-03-26 syoussefi@chromium.org Disable GPU perf tracking on D3D


Created with:
  gclient setdep -r third_party/externals/angle2@518c679da109

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:Perf-Win10-Clang-AlphaR2-GPU-RadeonR9M470X-x86_64-Debug-All-ANGLE;skia.primary:Perf-Win10-Clang-NUC5i7RYH-GPU-IntelIris6100-x86_64-Debug-All-ANGLE;skia.primary:Perf-Win10-Clang-NUC6i5SYK-GPU-IntelIris540-x86_64-Debug-All-ANGLE;skia.primary:Perf-Win10-Clang-NUCD34010WYKH-GPU-IntelHD4400-x86_64-Debug-All-ANGLE;skia.primary:Perf-Win10-Clang-ShuttleC-GPU-GTX960-x86_64-Debug-All-ANGLE;skia.primary:Test-Win10-Clang-AlphaR2-GPU-RadeonR9M470X-x86_64-Debug-All-ANGLE;skia.primary:Test-Win10-Clang-NUC6i5SYK-GPU-IntelIris540-x86_64-Debug-All-ANGLE;skia.primary:Test-Win10-Clang-NUCD34010WYKH-GPU-IntelHD4400-x86_64-Debug-All-ANGLE;skia.primary:Test-Win10-Clang-ShuttleC-GPU-GTX960-x86_64-Debug-All-ANGLE
TBR=stani@google.com

Change-Id: Ibe1a5edcefad98422b41b84738e8c8bdb5508fbf
Reviewed-on: https://skia-review.googlesource.com/c/skia/+/203928
Reviewed-by: skia-autoroll <skia-autoroll@skia-public.iam.gserviceaccount.com>
Commit-Queue: skia-autoroll <skia-autoroll@skia-public.iam.gserviceaccount.com>

DEPS

@@ -7,7 +7,7 @@ vars = {
 deps = {
   "buildtools"                            : "https://chromium.googlesource.com/chromium/buildtools.git@505de88083136eefd056e5ee4ca0f01fe9b33de8",
   "common"                                : "https://skia.googlesource.com/common.git@9737551d7a52c3db3262db5856e6bcd62c462b92",
-  "third_party/externals/angle2"          : "https://chromium.googlesource.com/angle/angle.git@a47e2a23ab4c86edcda3f2555ba44573797fe1c2",
+  "third_party/externals/angle2"          : "https://chromium.googlesource.com/angle/angle.git@518c679da10956a4c401214cf3ac304e09eb1a12",
   "third_party/externals/dng_sdk"         : "https://android.googlesource.com/platform/external/dng_sdk.git@96443b262250c390b0caefbf3eed8463ba35ecae",
   "third_party/externals/egl-registry"    : "https://skia.googlesource.com/external/github.com/KhronosGroup/EGL-Registry@a0bca08de07c7d7651047bedc0b653cfaaa4f2ae",
   "third_party/externals/expat"           : "https://android.googlesource.com/platform/external/expat.git@android-6.0.1_r55",