Roll src/third_party/skia 056944747072..51e15a69ce5b (8 commits) (#8885)

https://skia.googlesource.com/skia.git
/%2Blog/056944747072..51e15a69ce5b

git log 056944747072199150fbfe7cd220c246b446acf0..51e15a69ce5bef01ff0d0b5ae3d72c1b2ad3f799 --date=short --no-merges --format=%ad %ae %s
2019-05-07 bungeman@google.com Use SkTextEncoding enum instead of macros.
2019-05-07 ethannicholas@google.com fixed SkSL interpreter negate op
2019-05-07 robertphillips@google.com Loosen up checks in DDLSkSurfaceFlush
2019-05-07 herb@google.com Cleaup GrTextStrike and GrStrikeCache
2019-05-07 ethannicholas@google.com fixed SkSL interpreter test
2019-05-07 robertphillips@google.com Add test for DDLs and SkSurface::flush
2019-05-07 bungeman@google.com Mac slight hinting to be normal instead of none.
2019-05-06 chinmaygarde@google.com Allow building Skia with Fuchsia SDK enabled buildroots.

The AutoRoll server is located here: https://autoroll.skia.org/r/skia-flutter-autoroll

Documentation for the AutoRoller is here:
https://skia.googlesource.com/buildbot/+/master/autoroll/README.md

If the roll is causing failures, please contact the current sheriff (robertphillips@google.com), and stop
the roller if necessary.

DEPS

@@ -23,7 +23,7 @@ vars = {
   'fuchsia_git': 'https://fuchsia.googlesource.com',
   'github_git': 'https://github.com',
   'skia_git': 'https://skia.googlesource.com',
-  'skia_revision': '056944747072199150fbfe7cd220c246b446acf0',
+  'skia_revision': '51e15a69ce5bef01ff0d0b5ae3d72c1b2ad3f799',
 
   # 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: 2b744c46219449900961e167aaf9bd38
+Signature: 33b4ed077689b7069d30e38bce3c7db7
 
 UNUSED LICENSES: