Roll src/third_party/skia b88894c8811b..66d8006c2bb1 (5 commits) (#12178)

https://skia.googlesource.com/skia.git/+log/b88894c8811b..66d8006c2bb1

git log b88894c8811b..66d8006c2bb1 --date=short --no-merges --format='%ad %ae %s'
2019-09-10 ethannicholas@google.com fixed an assertion error with unspecified sksl array sizes
2019-09-10 recipe-mega-autoroller@chops-service-accounts.iam.gserviceaccount.com Roll recipe dependencies (trivial).
2019-09-10 brianosman@google.com GL: Don't leak shader objects when program linking fails
2019-09-10 bsalomon@google.com Adapt GrRectBlur for cases with rect W/H less than six sigma.
2019-09-10 jvanverth@google.com Hook up pinch-zoom and swipe gestures.

Created with:
  gclient setdep -r src/third_party/skia@66d8006c2bb1

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 mtklein@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=mtklein@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': 'b88894c8811b32d312a56234fd7354314ff43cd7',
+  'skia_revision': '66d8006c2bb1f980beaa302b47cb23d0d60ea81d',
 
   # 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: 53f182f171e376542504be5bddeaa696
+Signature: 74f59f4bf247930a9c4e3b04db74b92f
 
 UNUSED LICENSES: