Roll src/third_party/angle 6d9b8908b0bb..0a56f0e3d22d (2 commits)

https://chromium.googlesource.com/angle/angle.git/+log/6d9b8908b0bb..0a56f0e3d22d


git log 6d9b8908b0bb..0a56f0e3d22d --date=short --no-merges --format='%ad %ae %s'
2019-05-30 timvp@google.com Vulkan: Update front face mode during syncState()
2019-05-30 cnorthrop@google.com Revert "Vulkan: Use atomics in SerialFactory."


Created with:
  gclient setdep -r src/third_party/angle@0a56f0e3d22d

The AutoRoll server is located here: https://autoroll.skia.org/r/angle-chromium-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=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_optional_gpu_tests_rel
TBR=cwallez@google.com

Change-Id: I8b441387e8e0b60d8038598ed3a5db8bd6565a1f
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1637500
Reviewed-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@{#664834}