Roll Skia from 43b593cbdc2c to 6f520cd120c0 (4 revisions)

https://skia.googlesource.com/skia.git/+log/43b593cbdc2c..6f520cd120c0

2021-05-14 brianosman@google.com Enable vertex ID support on Metal
2021-05-14 johnstiles@google.com Enable proper testing of const arrays.
2021-05-14 johnstiles@google.com Cleanup TODO for constant-expression handling.
2021-05-14 csmartdalton@google.com Fix inflation radii of tessellated hairlines

If this roll has caused a breakage, revert this CL and stop the roller
using the controls here:
https://autoroll.skia.org/r/skia-lottie-ci-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

Change-Id: I41dc39ec868234ca5dc30448ad33ade393725d58
Cq-Include-Trybots: skia/skia.primary:Housekeeper-PerCommit-InfraTests
Tbr: borenet@google.com
Reviewed-on: https://skia-review.googlesource.com/c/lottie-ci/+/408797
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 77ee83a..239af51 100644
--- a/DEPS
+++ b/DEPS
@@ -11,7 +11,7 @@
   # 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': '43b593cbdc2c290960653d872802d7f4e6b4c60b',
+  'skia_revision': '6f520cd120c0a2d9d9ab80f24dd149ace70174e1',
   # Three lines of non-changing comments so that
   # the commit queue can handle CLs rolling Skia
   # and whatever else without interference from each other.