Roll Skia from 71bf78604ba1 to 12923c46963d (1 revision)

https://skia.googlesource.com/skia.git/+log/71bf78604ba1..12923c46963d

2021-06-18 reed@google.com Move more virtuals into ...Base to hide them from public api

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: I1f1c9285d0db7e740ba21846c68b36b029755ccd
Reviewed-on: https://skia-review.googlesource.com/c/skiabot-test/+/419878
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 e1eabbc..0a7321d 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': '71bf78604ba1b1327c90d09ddf4f3f9325c0e50f',
+  'skia_revision': '12923c46963dd1a7426973990be6575c706c60bd',
   # Three lines of non-changing comments so that
   # the commit queue can handle CLs rolling Skia
   # and whatever else without interference from each other.