Roll src/third_party/skia d0a404e84d47..ff82e15d014a (5 commits) (#13362)

https://skia.googlesource.com/skia.git/+log/d0a404e84d47..ff82e15d014a

git log d0a404e84d47..ff82e15d014a --date=short --no-merges --format='%ad %ae %s'
2019-10-25 herb@google.com Add GL Caps for Radeon Pro Vega
2019-10-25 emircan@google.com Disable async readback from protected memory
2019-10-25 herb@google.com Change from single prepareForDrawing to prepare[Mask|SDFT|Path]ForDrawing
2019-10-25 halcanary@google.com SkQP: mark several gms as unsuitable for skqp
2019-10-25 mtklein@google.com tweak ar/libtool setup

Created with:
  gclient setdep -r src/third_party/skia@ff82e15d014a

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': 'd0a404e84d4708a5e38ab653f221bace98778553',
+  'skia_revision': 'ff82e15d014a954a24b8df3615858d5d37748240',
 
   # 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: 2a796bbfe486471b01903a5231fe0f44
+Signature: ef4af3e934b4b36b18121a0ea84eca41
 
 UNUSED LICENSES: