Roll src/third_party/skia a2d7225..3d3150c (1 commits) (flutter#14680)

https://skia.googlesource.com/skia.git/+log/a2d7225c0fc1..3d3150c89c5f

git log a2d7225..3d3150c --date=short --first-parent --format='%ad %ae %s'
2019-12-24 herb@google.com Internalize color offset calculation to SubRun

Created with:
  gclient setdep -r src/third_party/skia@3d3150c89c5f

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 fmalita@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: fmalita@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': 'a2d7225c0fc1a85e861df30f7f97638e4eea6937',
+  'skia_revision': '3d3150c89c5ffc45ce42a42e7f1264d8acbc107f',
 
   # 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: 036c80409280fe7f6497444167f82402
+Signature: 15fe5114d8dea842938b9feb0f071ea3
 
 UNUSED LICENSES: