Roll Skia from c21e7df194c3 to a3af5190ed26 (1 revision)

https://skia.googlesource.com/skia.git/+log/c21e7df194c3..a3af5190ed26

2023-04-19 michaelludwig@google.com [graphite] Replace BlockReader with ShaderNode trees

If this roll has caused a breakage, revert this CL and stop the roller
using the controls here:
https://skia-autoroll.corp.goog/r/android-master-autoroll
Please CC djsollen@google.com,rmistry@google.com,scroggo@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/main/autoroll/README.md

Test: Presubmit checks will test this change.
Exempt-From-Owner-Approval: The autoroll bot does not require owner approval.
Bug: b/186777432
Change-Id: Ic6ccb0e692705d4e2e79fc887feb283540a49631