Roll src/third_party/skia 28ad6f869822..8ab1530cd3cd (5 commits) (#12614)

https://skia.googlesource.com/skia.git/+log/28ad6f869822..8ab1530cd3cd

git log 28ad6f869822..8ab1530cd3cd --date=short --no-merges --format='%ad %ae %s'
2019-09-27 recipe-mega-autoroller@chops-service-accounts.iam.gserviceaccount.com Roll recipe dependencies (trivial).
2019-09-27 recipe-mega-autoroller@chops-service-accounts.iam.gserviceaccount.com Roll recipe dependencies (trivial).
2019-09-27 bsalomon@google.com Remove vestiges of 32 float texture format support
2019-09-27 jvanverth@google.com Add gpu programmatic frame capture routines
2019-09-27 fmalita@chromium.org [skottie] Minimize top layer size

Created with:
  gclient setdep -r src/third_party/skia@8ab1530cd3cd

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 bungeman@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=bungeman@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': '28ad6f8698224daf58a2ae75071caa0dad9da583',
+  'skia_revision': '8ab1530cd3cd7a5da29de660b8c7dbe49ed2612a',
 
   # 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: 692c318320aa0bff90abc201bf5a3af3
+Signature: 55eee006dd0b038300b53c62995bc282
 
 UNUSED LICENSES: