Roll ANGLE from a8bb3df77a94 to 6dfd855a10fb (2 revisions)

https://chromium.googlesource.com/angle/angle.git/+log/a8bb3df77a94..6dfd855a10fb

2020-10-08 lehoangq@gmail.com Metal: Implement fence sync
2020-10-08 angle-autoroll@skia-public.iam.gserviceaccount.com Roll Vulkan-ValidationLayers from e171d8431cfa to 24184fe81c6f (3 revisions)

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 timvp@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/+doc/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;luci.chromium.try:linux-swangle-try-x64;luci.chromium.try:win-swangle-try-x86
Bug: None
Tbr: timvp@google.com
Change-Id: I190d352ed48dafca78ba3a2d8788f19c08b464f0
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2461958Reviewed-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@{#815193}

DEPS

@@ -207,7 +207,7 @@ 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': 'a8bb3df77a943b295c8d8b1d5a16a99adfc9557f',
+  'angle_revision': '6dfd855a10fb74660ad4723c7bc7307cbaa5219d',
   # Three lines of non-changing comments so that
   # the commit queue can handle CLs rolling SwiftShader
   # and whatever else without interference from each other.