Roll Skia from 163cc9124259 to 6b2121d0ec57 (4 revisions)

https://skia.googlesource.com/skia.git/+log/163cc9124259..6b2121d0ec57

2021-06-09 csmartdalton@google.com Wean tessellation off SkPathOps
2021-06-09 csmartdalton@google.com Disable DMSAA on WebGL
2021-06-09 skia-autoroll@skia-public.iam.gserviceaccount.com Roll ANGLE from 1ab6d214182b to 69f2fb0066e8 (12 revisions)
2021-06-09 skia-autoroll@skia-public.iam.gserviceaccount.com Roll SwiftShader from 3da42a3a2cd6 to 5ecc95a00e2b (1 revision)

If this roll has caused a breakage, revert this CL and stop the roller
using the controls here:
https://autoroll.skia.org/r/skia-skiabot-test-autoroll
Please CC borenet@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

Tbr: borenet@google.com
Test: Test: Test: Manually trigger conditions to test logging.
Test: Test: Test: angle_deqp_khr_gles31_tests --deqp-case=*geometry_shader*
Change-Id: I751bd4b2be01bbeedaf6677466c4e7a280ac8f8b
Reviewed-on: https://skia-review.googlesource.com/c/skiabot-test/+/416977
Reviewed-by: skia-autoroll <skia-autoroll@skia-public.iam.gserviceaccount.com>
Commit-Queue: skia-autoroll <skia-autoroll@skia-public.iam.gserviceaccount.com>
diff --git a/DEPS b/DEPS
index 4ac71c9..0ace64d 100644
--- a/DEPS
+++ b/DEPS
@@ -3,7 +3,7 @@
   # Three lines of non-changing comments so that
   # the commit queue can handle CLs rolling Skia
   # and whatever else without interference from each other.
-  'skia_revision': '163cc912425976a06b42e4ac890312f8aadf0b36',
+  'skia_revision': '6b2121d0ec5719e60d8b61621de2ae54e78183c6',
   # Three lines of non-changing comments so that
   # the commit queue can handle CLs rolling Skia
   # and whatever else without interference from each other.