Roll src/third_party/angle b939b4a7247d..006a15542867 (3 commits)

https://chromium.googlesource.com/angle/angle.git/+log/b939b4a7247d..006a15542867

git log b939b4a7247d..006a15542867 --date=short --first-parent --format='%ad %ae %s'
2019-12-04 angle-autoroll@skia-public.iam.gserviceaccount.com Roll third_party/vulkan-validation-layers/src 4fde9b750992..e72b61c7c20d (1 commits)
2019-12-04 angle-autoroll@skia-public.iam.gserviceaccount.com Roll third_party/SwiftShader b64fbfec4dcd..bbd0694f9ab2 (3 commits)
2019-12-04 angle-autoroll@skia-public.iam.gserviceaccount.com Roll third_party/spirv-tools/src 3ed4586044f2..e82a428605f6 (3 commits)

Created with:
  gclient setdep -r src/third_party/angle@006a15542867

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: I349b1ed5e9642ddeb2b705da02dfc2651daf8d72
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1950245Reviewed-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@{#721447}

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': 'b939b4a7247d169a825712600ef747d40a1eac8c',
+  'angle_revision': '006a1554286769ba417b0b06be430b129698b3a9',
   # Three lines of non-changing comments so that
   # the commit queue can handle CLs rolling SwiftShader
   # and whatever else without interference from each other.