Roll Skia from 148f04d50e98 to a12796b42c0e (13 revisions) (#25512)

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': '148f04d50e983fecb120583fb6b7f309a97a68f5',
+  'skia_revision': 'a12796b42c0e946bad64ec84fd97f19233ab116b',
 
   # 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

-Signature: fe5920cd74e31f1d7fde2f8067999f78
+Signature: cd02151fc8ef852c8f5ec58694f0a17a
 
 UNUSED LICENSES:
 
@@ -5134,6 +5134,8 @@ FILE: ../../../third_party/skia/src/sksl/ir/SkSLConstructorScalarCast.cpp
 FILE: ../../../third_party/skia/src/sksl/ir/SkSLConstructorScalarCast.h
 FILE: ../../../third_party/skia/src/sksl/ir/SkSLConstructorSplat.cpp
 FILE: ../../../third_party/skia/src/sksl/ir/SkSLConstructorSplat.h
+FILE: ../../../third_party/skia/src/sksl/ir/SkSLConstructorStruct.cpp
+FILE: ../../../third_party/skia/src/sksl/ir/SkSLConstructorStruct.h
 FILE: ../../../third_party/skia/src/sksl/ir/SkSLDoStatement.cpp
 FILE: ../../../third_party/skia/src/sksl/ir/SkSLExpressionStatement.cpp
 FILE: ../../../third_party/skia/src/sksl/ir/SkSLFieldAccess.cpp