Roll src/third_party/skia 2c043c2..4a522b7 (3 commits) (flutter#8201)

https://skia.googlesource.com/skia.git/%2Blog/2c043c288169..4a522b7e916c

git log 2c043c2..4a522b7 --date=short --no-merges --format=%ad %ae %s
2019-03-18 [email protected] Roll third_party/externals/swiftshader c2bb50b..00424c1 (1 commits)
2019-03-18 [email protected] [Android] Do not build for Windows
2019-03-18 [email protected] Roll third_party/externals/swiftshader 62758f5..c2bb50b (1 commits)

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': '2c043c28816981f4002e72a12d7ec446672aeb1c',
+  'skia_revision': '4a522b7e916c85c53df9d21351652857e3ff2512',
 
   # 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: a3c1d11b2ee8f43fdf008204a0b26395
+Signature: aa6c73966a5ec1867116b4523182926d
 
 UNUSED LICENSES: