Roll third_party/externals/angle2 e02f4996c6e9..a8e6a463121b (8 commits)

https://chromium.googlesource.com/angle/angle.git/+log/e02f4996c6e9..a8e6a463121b

git log e02f4996c6e9..a8e6a463121b --date=short --first-parent --format='%ad %ae %s'
2020-02-09 jmadill@chromium.org Suppress Vulkan RobustResourceInit tests.
2020-02-09 b.schade@samsung.com Change g_Mutex from std::mutex to std::recursive_mutex
2020-02-08 cnorthrop@google.com Capture/Replay: Add 2DArray and 3D texture support for MEC
2020-02-08 jmadill@chromium.org Make Debug marker functions return angle::Result.
2020-02-07 jmadill@chromium.org Vulkan: Clamp vertex buffer offsets.
2020-02-07 jmadill@chromium.org Vulkan: Add missing wrapper functions for XFB.
2020-02-07 angle-autoroll@skia-public.iam.gserviceaccount.com Roll third_party/spirv-tools/src 1f03ac10270a..fe10239f92f4 (1 commits)
2020-02-07 angle-autoroll@skia-public.iam.gserviceaccount.com Roll third_party/glslang/src 656650f461c8..95c414ffee64 (2 commits)

Created with:
  gclient setdep -r third_party/externals/angle2@a8e6a463121b

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 stani@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-Debian9-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: stani@google.com
Change-Id: I33a6d40f4f8908792c29014029a27ecece5e340d
Reviewed-on: https://skia-review.googlesource.com/c/skia/+/269717
Reviewed-by: skia-autoroll <skia-autoroll@skia-public.iam.gserviceaccount.com>
Commit-Queue: skia-autoroll <skia-autoroll@skia-public.iam.gserviceaccount.com>
diff --git a/DEPS b/DEPS
index edc52a8..7aff1cc 100644
--- a/DEPS
+++ b/DEPS
@@ -7,7 +7,7 @@
 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@e02f4996c6e91023a019d071f4c167523c847ed4",
+  "third_party/externals/angle2"          : "https://chromium.googlesource.com/angle/angle.git@a8e6a463121b9920564fb6efd7f2c857d7023fe3",
   "third_party/externals/dawn"            : "https://dawn.googlesource.com/dawn.git@604072bc2ed01018eb03bcbbf9d94042f679af63",
   "third_party/externals/dng_sdk"         : "https://android.googlesource.com/platform/external/dng_sdk.git@c8d0c9b1d16bfda56f15165d39e0ffa360a11123",
   "third_party/externals/egl-registry"    : "https://skia.googlesource.com/external/github.com/KhronosGroup/EGL-Registry@a0bca08de07c7d7651047bedc0b653cfaaa4f2ae",