Roll Skia from 0abd7276b8df to f21d6b9b717c (3 revisions) (#20271)

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': '0abd7276b8dfea73d3ffa5c12c374f5a8f95e088',
+  'skia_revision': 'f21d6b9b717c0d09ad9ec1db0de77166abb9372f',
 
   # 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: 1e8c1566c697f9d56192dca477e0ba7a
+Signature: 3e073de60f9a88dcf15281cc17b1e4e0
 
 UNUSED LICENSES:
 
@@ -3901,6 +3901,7 @@ FILE: ../../../third_party/skia/include/gpu/GrBackendSurfaceMutableState.h
 FILE: ../../../third_party/skia/include/gpu/d3d/GrD3DBackendContext.h
 FILE: ../../../third_party/skia/include/gpu/d3d/GrD3DTypes.h
 FILE: ../../../third_party/skia/include/gpu/d3d/GrD3DTypesMinimal.h
+FILE: ../../../third_party/skia/include/ports/SkImageGeneratorNDK.h
 FILE: ../../../third_party/skia/include/private/GrD3DTypesPriv.h
 FILE: ../../../third_party/skia/include/private/SkIDChangeListener.h
 FILE: ../../../third_party/skia/include/private/SkSLSampleUsage.h
@@ -3981,6 +3982,7 @@ FILE: ../../../third_party/skia/src/gpu/glsl/GrGLSLUniformHandler.cpp
 FILE: ../../../third_party/skia/src/gpu/vk/GrVkManagedResource.h
 FILE: ../../../third_party/skia/src/image/SkRescaleAndReadPixels.cpp
 FILE: ../../../third_party/skia/src/image/SkRescaleAndReadPixels.h
+FILE: ../../../third_party/skia/src/ports/SkImageGeneratorNDK.cpp
 FILE: ../../../third_party/skia/src/sksl/SkSLAnalysis.h
 FILE: ../../../third_party/skia/src/sksl/SkSLDehydrator.cpp
 FILE: ../../../third_party/skia/src/sksl/SkSLDehydrator.h