Roll src/third_party/angle 249cb200173f..b939b4a7247d (1 commits)

https://chromium.googlesource.com/angle/angle.git/+log/249cb200173f..b939b4a7247d

git log 249cb200173f..b939b4a7247d --date=short --first-parent --format='%ad %ae %s'
2019-12-04 angle-autoroll@skia-public.iam.gserviceaccount.com Roll third_party/glslang/src a4af7676feb0..e58c080d4f02 (1 commits)

Created with:
  gclient setdep -r src/third_party/angle@b939b4a7247d

If this roll has caused a breakage, revert this CL and stop the roller
using the controls here:
https://autoroll.skia.org/r/angle-chromium-autoroll
Please CC geofflang@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: luci.chromium.try:android_optional_gpu_tests_rel;luci.chromium.try:linux_optional_gpu_tests_rel;luci.chromium.try:mac_optional_gpu_tests_rel;luci.chromium.try:win-asan;luci.chromium.try:win_optional_gpu_tests_rel
Bug: None
Tbr: geofflang@google.com
Change-Id: I43b14eb77064c953a4b4a1aed5060120447e3dba
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1949541Reviewed-by: chromium-autoroll <chromium-autoroll@skia-public.iam.gserviceaccount.com>
Commit-Queue: chromium-autoroll <chromium-autoroll@skia-public.iam.gserviceaccount.com>
Cr-Commit-Position: refs/heads/master@{#721411}

DEPS

@@ -184,7 +184,7 @@ vars = {
   # Three lines of non-changing comments so that
   # the commit queue can handle CLs rolling ANGLE
   # and whatever else without interference from each other.
-  'angle_revision': '249cb200173f3fcbd5055399fee0a3e5b8721c86',
+  'angle_revision': 'b939b4a7247d169a825712600ef747d40a1eac8c',
   # Three lines of non-changing comments so that
   # the commit queue can handle CLs rolling SwiftShader
   # and whatever else without interference from each other.