Roll Skia from 7b2af606d352 to 55ca4e692d8f (1 revision)

https://skia.googlesource.com/skia.git/+log/7b2af606d352..55ca4e692d8f

2021-08-16 nigeltao@google.com Check out third_party/wuffs' "release/c" mirror

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: Ifc140438ffc876a489e71c54e183fca3a71a013d