Roll src/third_party/skia 31ba6feaf6b3..e9fd7ab76ec0 (3 commits) (#7478)

https://skia.googlesource.com/skia.git/%2Blog/31ba6feaf6b3..e9fd7ab76ec0

git log 31ba6feaf6b34019c0869edf3ae3b02c19731022..e9fd7ab76ec0d84a449b82448f9062ad567466db --date=short --no-merges --format=%ad %ae %s
2019-01-14 reed@google.com don't say experimental if its documented in bmh
2019-01-15 reed@google.com Reland "remove SK_SUPPORT_LEGACY_PAINT_FONT_FIELDS"
2019-01-14 csmartdalton@google.com Remove "canCombineOverlappedStencilAndCover"

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 (halcanary@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': '31ba6feaf6b34019c0869edf3ae3b02c19731022',
+  'skia_revision': 'e9fd7ab76ec0d84a449b82448f9062ad567466db',
 
   # 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: 7f8f553b5b5fbf13c71e6c1a711418db
+Signature: 2b0fbd0d9332fa06df5631c35a0ebf28
 
 UNUSED LICENSES: