Roll Skia from 83973655240a to b1ea9a1a9d03 (7 revisions)

https://skia.googlesource.com/skia.git/+log/83973655240a..b1ea9a1a9d03

2022-04-07 fmalita@chromium.org Export EGL sources/headers in public.bzl
2022-04-07 egdaniel@google.com Move all Ganesh source files into ganesh subdirectory.
2022-04-07 ethannicholas@google.com Improved SkSL Block and Do position tracking
2022-04-07 kjlubick@google.com Update Skia to use the new combined Dawn+Tint repo
2022-04-07 johnstiles@google.com Reduce complexity in set-color-saturation.
2022-04-07 brianosman@google.com Reland "Set GN's script_executable to "python3""
2022-04-07 kjlubick@google.com [debugger] Fix missing audit trails

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 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: Ib3f9d306df2bea9d8ba91d23b5955b82d591f4c4