Roll src/third_party/skia 808f021b51df..d59053987a27 (4 commits) (#15882)

https://skia.googlesource.com/skia.git/+log/808f021b51df..d59053987a27

git log 808f021b51df..d59053987a27 --date=short --first-parent --format='%ad %ae %s'
2020-01-22 skia-autoroll@skia-public.iam.gserviceaccount.com Roll third_party/externals/angle2 845a09b8241e..8c396a9cc4a8 (5 commits)
2020-01-22 skia-autoroll@skia-public.iam.gserviceaccount.com Roll third_party/externals/swiftshader 11cb891a01a2..b766e5e7fbf4 (1 commits)
2020-01-22 skia-autoroll@skia-public.iam.gserviceaccount.com Roll ../src 4c7513580a6e..f2517d68dfde (355 commits)
2020-01-22 recipe-mega-autoroller@chops-service-accounts.iam.gserviceaccount.com Roll recipe dependencies (trivial).

Created with:
  gclient setdep -r src/third_party/skia@d59053987a27

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 benjaminwagner@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: benjaminwagner@google.com

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': '808f021b51df9ad139ad328ccf5b4630000ac5b3',
+  'skia_revision': 'd59053987a27c74333073e03fdd5e8f4d4fe2f16',
 
   # 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: 5385ecf4ab4b06d7b9e70d4ed767a176
+Signature: 4e85c369de795951b56f624921748c56
 
 UNUSED LICENSES: