Roll Skia from 4eb7c23d5289 to b8123cc87770 (6 revisions) (#22358)

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': '4eb7c23d5289df65281f3030f4ae3fc0ac28707b',
+  'skia_revision': 'b8123cc87770df6cfcdfce3290c60fdfdbfa8365',
 
   # 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: bfde14462014c71ff670b6073f62ffe0
+Signature: 4ea43c822be6214efdb299275308cc58
 
 UNUSED LICENSES:
 
@@ -4084,6 +4084,7 @@ FILE: ../../../third_party/skia/gm/verifiers/gmverifier.cpp
 FILE: ../../../third_party/skia/gm/verifiers/gmverifier.h
 FILE: ../../../third_party/skia/gm/widebuttcaps.cpp
 FILE: ../../../third_party/skia/include/core/SkM44.h
+FILE: ../../../third_party/skia/include/core/SkSamplingOptions.h
 FILE: ../../../third_party/skia/include/effects/SkStrokeAndFillPathEffect.h
 FILE: ../../../third_party/skia/include/gpu/GrDirectContext.h
 FILE: ../../../third_party/skia/include/private/SkOpts_spi.h