Roll src/third_party/skia 5bbd02d6bb3d..478d7d46f8d7 (1 commits) (flutter/engine#7948)

https://skia.googlesource.com/skia.git/%2Blog/5bbd02d6bb3d..478d7d46f8d7

git log 5bbd02d6bb3d933fbe73d6b8fc915caa120bbcaf..478d7d46f8d7e14fa940fd7318f38e6cbc8bc19f --date=short --no-merges --format=%ad %ae %s
2019-02-25 recipe-roller@chromium.org Roll recipe dependencies (trivial).

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 (scroggo@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': '5bbd02d6bb3d933fbe73d6b8fc915caa120bbcaf',
+  'skia_revision': '478d7d46f8d7e14fa940fd7318f38e6cbc8bc19f',
 
   # When updating the Dart revision, ensure that all entries that are
   # dependencies of Dart are also updated to match the entries in the

engine/src/flutter/ci/licenses_golden/licenses_skia

@@ -1,4 +1,4 @@
-Signature: 98c48a161adee775ef2d5d8aaf331110
+Signature: bb02dc4920cacedb57bb14197d80e96a
 
 UNUSED LICENSES: