Roll third_party/externals/angle2 5407aaa..751e788 (13 commits)

https://chromium.googlesource.com/angle/angle.git/+log/5407aaa089ac..751e78884a55

git log 5407aaa..751e788 --date=short --first-parent --format='%ad %ae %s'
2019-12-18 b.schade@samsung.com Update with official gl.xml and re-sort added formats
2019-12-17 ianelliott@google.com Vulkan: Update expectations for newly-passing tests
2019-12-17 jmadill@chromium.org Vulkan: Fix layers being disabled in tests.
2019-12-17 jmadill@chromium.org Pass GLImplFactory to Query constructor.
2019-12-17 tobine@google.com Vulkan:Lazily link libvulkan
2019-12-17 jmadill@chromium.org Move Serial utils to their own file.
2019-12-17 jmadill@chromium.org Make Sync constructors take GLImplFactory.
2019-12-17 syoussefi@chromium.org Vulkan: Enable inactive SSBO with unsized array tests
2019-12-17 jmadill@chromium.org Vulkan: Fix SwiftShader disabled build.
2019-12-17 syoussefi@chromium.org Vulkan: EXT_gpu_shader5: non-const offset in textureGatherOffset
2019-12-17 syoussefi@chromium.org Improve presubmit's Bug: tag check
2019-12-17 syoussefi@chromium.org Vulkan: fix handling of inactive atomic counters
2019-12-17 angle-autoroll@skia-public.iam.gserviceaccount.com Roll third_party/spirv-tools/src 96354f5047bf..38d7fbaad0a3 (2 commits)

Created with:
  gclient setdep -r third_party/externals/angle2@751e78884a55

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 borenet@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: borenet@google.com
Change-Id: I8aca73995c1646fff031ab4b7cc5e32e2bca4481
Reviewed-on: https://skia-review.googlesource.com/c/skia/+/260742
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@5407aaa089ac1eecad3daf672bd3ccf8328addf1",
+  "third_party/externals/angle2"          : "https://chromium.googlesource.com/angle/angle.git@751e78884a55e66af0ee7f3eaf8dc485bb3c21c9",
   "third_party/externals/dawn"            : "https://dawn.googlesource.com/dawn.git@3c086a0c2e1dc3e2e14aaa3d78c052c7e07274b4",
   "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",