Roll Skia from 4ac9aadd306b to a77620bf091c (1 revision)

https://skia.googlesource.com/skia.git/+log/4ac9aadd306b..a77620bf091c

2021-02-25 westont@google.com Add Radeon GPU Metal initial tests.

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
Change-Id: I127b8108e55239bb3cdd2f4226680fff290d78e0
Reviewed-on: https://skia-review.googlesource.com/c/skiabot-test/+/377226
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 96a8bd0..55590bc 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': '4ac9aadd306b2f22badfd982bb13987aa8b493e4',
+  'skia_revision': 'a77620bf091c684846df86ca8d19463ade3b1e75',
   # Three lines of non-changing comments so that
   # the commit queue can handle CLs rolling Skia
   # and whatever else without interference from each other.