Roll src/third_party/angle 6fead3754375..20983e35b3f9 (1 commits)

https://chromium.googlesource.com/angle/angle.git/+log/6fead3754375..20983e35b3f9

git log 6fead3754375..20983e35b3f9 --date=short --first-parent --format='%ad %ae %s'
2020-03-24 angle-autoroll@skia-public.iam.gserviceaccount.com Roll third_party/SwiftShader 22d73d15e778..6c11cf2ad9ca (5 commits)

Created with:
  gclient setdep -r src/third_party/angle@20983e35b3f9

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 cnorthrop@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: cnorthrop@google.com
Change-Id: I30b485e412fdbf4c4fe25e1a7beb271408d6c869
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2117488Reviewed-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@{#752783}

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': '6fead3754375fb086cd7fa6ccef650d102dee06d',
+  'angle_revision': '20983e35b3f96a86526542f6b477cad2777fad5b',
   # Three lines of non-changing comments so that
   # the commit queue can handle CLs rolling SwiftShader
   # and whatever else without interference from each other.