Roll Skia from ca13a3acc4b2 to 6bc126d24d1b (1 revision)

https://skia.googlesource.com/skia.git/+log/ca13a3acc4b2..6bc126d24d1b

2021-08-07 michaelludwig@google.com Revert "Use a table for dither effect rather than math."

If this roll has caused a breakage, revert this CL and stop the roller
using the controls here:
https://autoroll.skia.org/r/skia-flutter-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

Author: skia-flutter-autoroll

DEPS

@@ -27,7 +27,7 @@ vars = {
   'skia_git': 'https://skia.googlesource.com',
   # OCMock is for testing only so there is no google clone
   'ocmock_git': 'https://github.com/erikdoe/ocmock.git',
-  'skia_revision': 'ca13a3acc4b22f321c400f612909227d177de571',
+  'skia_revision': '6bc126d24d1be28c2d870aa4e68e716cda082667',
 
   # When updating the Dart revision, ensure that all entries that are
   # dependencies of Dart are also updated to match the entries in the

ci/licenses_golden/licenses_skia

@@ -1,4 +1,4 @@
-Signature: 3896256b42aea0b9c545d57295e4ee88
+Signature: 2d556f5db8be06e3fd6191843f895976
 
 UNUSED LICENSES: