Roll Skia from ca7976f799a9 to 25c0e1a8dd74 (3 revisions)

https://skia.googlesource.com/skia.git/+log/ca7976f799a9..25c0e1a8dd74

2021-11-29 herb@google.com GrSlug prototype
2021-11-29 johnstiles@google.com Allow setting a trace coordinate without a skvm::Builder.
2021-11-29 bungeman@google.com Remove unused text format constants.

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 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: Id5ff895378c44883b034af84b710f1e6234b4c17