Roll Skia from ca107c9b70f9 to 7b9934300a1b (3 revisions)

https://skia.googlesource.com/skia.git/+log/ca107c9b70f9..7b9934300a1b

2021-02-19 reed@google.com Remove unused convexity code
2021-02-19 brianosman@google.com Temporary fix for bad data pushed to Android test devices
2021-02-19 johnstiles@google.com Improve error reporting from DSL unit tests.

If this roll has caused a breakage, revert this CL and stop the roller
using the controls here:
https://autoroll.skia.org/r/skia-lottie-ci-autoroll
Please CC borenet@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/master/autoroll/README.md

Change-Id: I7ff7cad02d7a871ff8c9b71f344a02ce479f8c8d
Cq-Include-Trybots: skia/skia.primary:Housekeeper-PerCommit-InfraTests
Tbr: borenet@google.com
Reviewed-on: https://skia-review.googlesource.com/c/lottie-ci/+/372578
Reviewed-by: skia-autoroll <skia-autoroll@skia-public.iam.gserviceaccount.com>
Commit-Queue: skia-autoroll <skia-autoroll@skia-public.iam.gserviceaccount.com>
diff --git a/DEPS b/DEPS
index 6bc1b68..255126c 100644
--- a/DEPS
+++ b/DEPS
@@ -11,7 +11,7 @@
   # Three lines of non-changing comments so that
   # the commit queue can handle CLs rolling Skia
   # and whatever else without interference from each other.
-  'skia_revision': 'ca107c9b70f9594f88e8c594abde1d96dde55d42',
+  'skia_revision': '7b9934300a1b92f44f69c7ceae4d9d2f4d4f881b',
   # Three lines of non-changing comments so that
   # the commit queue can handle CLs rolling Skia
   # and whatever else without interference from each other.