Roll src/third_party/skia 55f9cba6e2e7..f22c57ddcc8c (1 commits) (flutter#13136)

https://skia.googlesource.com/skia.git/+log/55f9cba6e2e7..f22c57ddcc8c

git log 55f9cba6e2e7..f22c57ddcc8c --date=short --no-merges --format='%ad %ae %s'
2019-10-15 robertphillips@google.com Centralize GrSamplerState key creation

Created with:
  gclient setdep -r src/third_party/skia@f22c57ddcc8c

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 csmartdalton@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/+/master/autoroll/README.md

Bug: None
TBR=csmartdalton@google.com

Author: skia-flutter-autoroll

DEPS

@@ -26,7 +26,7 @@ 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': '55f9cba6e2e7b8ff3ba4f1453349db26e547cb28',
+  'skia_revision': 'f22c57ddcc8c13712cbca4ed9bfc2f06dc8b895f',
 
   # 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: ab7888ae8d5b7010367d20243973f9de
+Signature: 1b1fd6c9c3ac6c254c0e00a1a01f7367
 
 UNUSED LICENSES: