Roll Skia from 121d4a2e4bcf to 7c6a1526f70e (5 revisions)

https://skia.googlesource.com/skia.git/+log/121d4a2e4bcf..7c6a1526f70e

2022-03-30 kjlubick@google.com Free FontChains after test completes
2022-03-30 kjlubick@google.com Fix memory leak in AAClipTest
2022-03-30 jvanverth@google.com Fix setup for iOS simulator on arm64 Macs.
2022-03-30 johnstiles@google.com Disable test OutParamsAreDistinctFromGlobal on some platforms.
2022-03-30 michaelludwig@google.com Take edge AA flags into account when applying implicit device bounds clip

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: Id8c930ec89e1023c4e34acda25a91f802a8d5c7a