Roll src/third_party/skia 25071cc52b4b..8be917af4313 (6 commits) (#8564)

https://skia.googlesource.com/skia.git/%2Blog/25071cc52b4b..8be917af4313

git log 25071cc52b4bc5858d812d2aa10983bdbe3b9eef..8be917af4313f6021b9b8e5d2b3f4d5712967aa9 --date=short --no-merges --format=%ad %ae %s
2019-04-11 herb@google.com Convert the CPU path case to use prepareForDrawing
2019-04-12 benjaminwagner@google.com Factor common SSH logic into a new flavor.
2019-04-12 reed@google.com remove dead code from old factories, enum
2019-04-11 mtklein@google.com replace Sk4px with SkVx in SkBlitter_ARGB32
2019-04-12 brianosman@google.com GLSL editing in Viewer
2019-04-12 michaelludwig@google.com Make sure local rects are sorted post-clipping

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 (egdaniel@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': '25071cc52b4bc5858d812d2aa10983bdbe3b9eef',
+  'skia_revision': '8be917af4313f6021b9b8e5d2b3f4d5712967aa9',
 
   # 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: 34f939e02258658541e37722715ed008
+Signature: 0f615c414aeea570c36bdf3addef58eb
 
 UNUSED LICENSES: