Roll src/third_party/angle 6fc0066aad67..e20f36f49562 (3 commits)

https://chromium.googlesource.com/angle/angle.git/+log/6fc0066aad67..e20f36f49562

git log 6fc0066aad67..e20f36f49562 --date=short --first-parent --format='%ad %ae %s'
2020-04-23 j.vigil@samsung.com EGL: Implement EGL_ANDROID_native_fence_sync on vulkan
2020-04-23 jmadill@chromium.org Vulkan: Mask out implementation dirty bit in sync.
2020-04-23 jmadill@chromium.org Vulkan: Track allocated sampler counts.

Created with:
  gclient setdep -r src/third_party/angle@e20f36f49562

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 tobine@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;luci.chromium.try:linux-swangle-try-x64;luci.chromium.try:win-swangle-try-x86
Bug: None
Tbr: tobine@google.com
Change-Id: I9d4d77aeed05dbb02a6660bd586d18ca69e8a4ac
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2163458Reviewed-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@{#762105}

DEPS

@@ -187,7 +187,7 @@ 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': '6fc0066aad6772ff6173bf0f58e488f7ebdda1a3',
+  'angle_revision': 'e20f36f49562d7860bcb122e99a24dc142a80fd4',
   # Three lines of non-changing comments so that
   # the commit queue can handle CLs rolling SwiftShader
   # and whatever else without interference from each other.