Roll src/third_party/skia 5afc7b2..7579996 (2 commits) (flutter#14324)

https://skia.googlesource.com/skia.git/+log/5afc7b2af854..75799967be60

git log 5afc7b2..7579996 --date=short --first-parent --format='%ad %ae %s'
2019-12-11 skia-autoroll@skia-public.iam.gserviceaccount.com Roll third_party/externals/angle2 f60da87..d6053da (8 commits)
2019-12-11 skia-autoroll@skia-public.iam.gserviceaccount.com Roll third_party/externals/swiftshader 31916f494c2e..50211670b4bf (28 commits)

Created with:
  gclient setdep -r src/third_party/skia@75799967be60

If this roll has caused a breakage, revert this CL and stop the roller
using the controls here:
https://autoroll.skia.org/r/skia-flutter-autoroll
Please CC djsollen@google.com on the revert to ensure that a human
is aware of the problem.

To report a problem with the AutoRoller itself, please file a bug:
https://bugs.chromium.org/p/skia/issues/entry?template=Autoroller+Bug

Documentation for the AutoRoller is here:
https://skia.googlesource.com/buildbot/+/master/autoroll/README.md

Bug: None
Tbr: djsollen@google.com

Author: skia-flutter-autoroll

DEPS

@@ -26,7 +26,7 @@ vars = {
   'skia_git': 'https://skia.googlesource.com',
   # OCMock is for testing only so there is no google clone
   'ocmock_git': 'https://github.com/erikdoe/ocmock.git',
-  'skia_revision': '5afc7b2af854319bedc5acd067f14bbffac269b4',
+  'skia_revision': '75799967be60668214cd3a307203128d0d583095',
 
   # 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: f4fd446862a83218bdd8559ce7845752
+Signature: d7102792d8fd65d68dec31ed1c1a786d
 
 UNUSED LICENSES: