Roll src/third_party/skia 09c01e9..4037f7f (3 commits) (flutter#7821)

https://skia.googlesource.com/skia.git/%2Blog/09c01e9df260..4037f7f5d8b4

git log 09c01e9..4037f7f --date=short --no-merges --format=%ad %ae %s
2019-02-14 [email protected] Roll third_party/externals/angle2 6fc22a1..52047de (3 commits)
2019-02-13 [email protected] remove unused variable
2019-02-13 [email protected] Fix bug of SkSVGCanvas::Make

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 ([email protected]), and stop
the roller if necessary.

Author: skia-flutter-autoroll

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': '09c01e9df260053399eb22efcfd6b248d66a2492',
+  'skia_revision': '4037f7f5d8b465f50f28135bfe0e532e2154089f',
 
   # 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

@@ -1,4 +1,4 @@
-Signature: e3ce43a011f4c900bdb29fb2a33f69c9
+Signature: 35cfaa0386f42e330e737a56d69fe391
 
 UNUSED LICENSES: