Roll src/third_party/skia 28a8f28b3eaf..24a409611f24 (2 commits) (#13352)

https://skia.googlesource.com/skia.git/+log/28a8f28b3eaf..24a409611f24

git log 28a8f28b3eaf..24a409611f24 --date=short --no-merges --format='%ad %ae %s'
2019-10-25 skia-autoroll@skia-public.iam.gserviceaccount.com Roll third_party/externals/angle2 b2885bc4a40f..77fba58c9658 (16 commits)
2019-10-25 skia-autoroll@skia-public.iam.gserviceaccount.com Roll third_party/externals/swiftshader 883e817b14bf..6d69aae0e1ab (3 commits)

Created with:
  gclient setdep -r src/third_party/skia@24a409611f24

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 michaelludwig@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=michaelludwig@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': '28a8f28b3eaf5fc9a1019ca402eebfbfc1a2f0ba',
+  'skia_revision': '24a409611f248f7d16ce37ea5667e8334458aaf6',
 
   # 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: 3fdca8460f51a20cff9fe157b5f4c18f
+Signature: 0a29dc8fa296ba50c1c69483e5e997cb
 
 UNUSED LICENSES: