Roll Skia from 96713facd789 to c845272b4e97 (11 revisions)

https://skia.googlesource.com/skia.git/+log/96713facd789..c845272b4e97

2021-10-07 ethannicholas@google.com Broke DSLWriter into two separate classes
2021-10-07 herb@google.com Reland "change matrix_2x3 to row-major"
2021-10-07 egdaniel@google.com [graphite] Add TextureProxy support.
2021-10-07 michaelludwig@google.com Revert "Allow tracking of Precompositions onEnter/onExit"
2021-10-07 johnstiles@google.com Migrate compiler elimination passes to Transform.
2021-10-07 michaelludwig@google.com [graphite] Add Shape variant over path, rect, rrect, convex poly
2021-10-07 johnstiles@google.com Make Program owned-elements public.
2021-10-07 johnstiles@google.com Migrate IsConstantExpression out of SkSLAnalysis.
2021-10-07 johnstiles@google.com Migrate GetLoopUnrollInfo out of SkSLAnalysis.
2021-10-07 johnstiles@google.com Migrate CanExitWithoutReturningValue out of SkSLAnalysis.
2021-10-07 brianosman@google.com Fix particles demo page

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 nifong@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: Ibee2a5fbb693cd2a460dfc861fa3eed5d0c306f8