Roll Skia from 0270bf5d10be to 4e9d5e2bdf04 (5 revisions)

https://skia.googlesource.com/skia.git/+log/0270bf5d10be..4e9d5e2bdf04

2021-05-12 michaelludwig@google.com Use Wang's formula for quadratic and cubic point counts
2021-05-12 johnstiles@google.com Revert "The Matrices test now verifies its results."
2021-05-12 reed@google.com Can ctrl-key work on non-macs?
2021-05-12 ethannicholas@google.com Revert "Revert "Added DSL flags""
2021-05-12 herb@google.com switch to SkMutex in SkStrike

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 robertphillips@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

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': '0270bf5d10bee1dca5b75dfee93d25eaa9ecd269',
+  'skia_revision': '4e9d5e2bdf04c58bc0bff57be7171e469e5d7175',
 
   # 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: 08cc43d2e97f4b52e1b1ce46ad820eff
+Signature: eafbba4e51f1f10199bb89ccf5bab3a3
 
 UNUSED LICENSES:
 
@@ -3883,6 +3883,7 @@ FILE: ../../../third_party/skia/src/gpu/effects/generated/GrArithmeticProcessor.
 FILE: ../../../third_party/skia/src/gpu/effects/generated/GrArithmeticProcessor.h
 FILE: ../../../third_party/skia/src/gpu/effects/generated/GrDitherEffect.cpp
 FILE: ../../../third_party/skia/src/gpu/effects/generated/GrDitherEffect.h
+FILE: ../../../third_party/skia/src/gpu/geometry/GrWangsFormula.h
 FILE: ../../../third_party/skia/src/gpu/mock/GrMockOpTarget.h
 FILE: ../../../third_party/skia/src/gpu/ops/GrSimpleMeshDrawOpHelperWithStencil.cpp
 FILE: ../../../third_party/skia/src/gpu/ops/GrSimpleMeshDrawOpHelperWithStencil.h
@@ -3898,7 +3899,6 @@ FILE: ../../../third_party/skia/src/gpu/tessellate/GrStrokeIndirectTessellator.c
 FILE: ../../../third_party/skia/src/gpu/tessellate/GrStrokeIndirectTessellator.h
 FILE: ../../../third_party/skia/src/gpu/tessellate/GrStrokeIterator.h
 FILE: ../../../third_party/skia/src/gpu/tessellate/GrVectorXform.h
-FILE: ../../../third_party/skia/src/gpu/tessellate/GrWangsFormula.h
 FILE: ../../../third_party/skia/src/gpu/text/GrSDFTControl.cpp
 FILE: ../../../third_party/skia/src/gpu/text/GrSDFTControl.h
 FILE: ../../../third_party/skia/src/opts/SkOpts_skx.cpp