Roll src/third_party/angle a1442ecdf514..471358f39a6a (2 commits)

https://chromium.googlesource.com/angle/angle.git/+log/a1442ecdf514..471358f39a6a


git log a1442ecdf514..471358f39a6a --date=short --no-merges --format='%ad %ae %s'
2018-11-29 syoussefi@chromium.org Vulkan: fix pipeline stages of memory barriers
2018-11-29 matavenrath@nvidia.com Optimize State::syncDirtyObjects


Created with:
  gclient setdep -r src/third_party/angle@471358f39a6a

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=fjhenigman@chromium.org

Change-Id: Iad8707cc33c68cf716b17b6f184389220509bba7
Reviewed-on: https://chromium-review.googlesource.com/c/1355241Reviewed-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@{#612295}

DEPS

@@ -124,7 +124,7 @@ 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': 'a1442ecdf5142b40cab85caf9f472b6bece9bf5f',
+  'angle_revision': '471358f39a6a53b97575f0074f466892babd8efc',
   # Three lines of non-changing comments so that
   # the commit queue can handle CLs rolling build tools
   # and whatever else without interference from each other.