Roll src/third_party/skia f1b2b42..9c1d30d (8 commits) (#16060)

https://skia.googlesource.com/skia.git/+log/f1b2b42613cb..9c1d30dd163e

git log f1b2b42..9c1d30d --date=short --first-parent --format='%ad %ae %s'
2020-01-27 recipe-mega-autoroller@chops-service-accounts.iam.gserviceaccount.com Roll recipe dependencies (trivial).
2020-01-27 recipe-mega-autoroller@chops-service-accounts.iam.gserviceaccount.com Roll recipe dependencies (trivial).
2020-01-27 mtklein@google.com draw whole grid
2020-01-27 fmalita@chromium.org [skottie] Cleanup: convert transform adapters to new pattern
2020-01-27 mtklein@google.com rm mtklein@chromium
2020-01-27 bsalomon@google.com Revert "Switch runtime SkSL to always sample at explicit coords"
2020-01-27 jvanverth@google.com Revert "Wrap page index packing in helper methods."
2020-01-27 brianosman@google.com Switch runtime SkSL to always sample at explicit coords

Created with:
  gclient setdep -r src/third_party/skia@9c1d30dd163e

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 reed@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: reed@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': 'f1b2b42613cbde15ee3f3ddfa0d46f8d0d031319',
+  'skia_revision': '9c1d30dd163efd53f2ffd03dcc31be00fdd7f638',
 
   # 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: 79a1b736832286c66927c7e27eb4ab14
+Signature: a51fb65ecf43a09a84bdd92c44203943
 
 UNUSED LICENSES: