Roll Skia from f8a6b5b to 5160e8c (9 revisions) (#19647)

https://skia.googlesource.com/skia.git/+log/f8a6b5b4b0d0..5160e8caa226

2020-07-10 mtklein@google.com Revert "Exclude gl files for Fuchsia platform."
2020-07-10 fmalita@chromium.org [skottie] Fill-over-stroke support for text
2020-07-10 guruji@google.com Exclude gl files for Fuchsia platform.
2020-07-10 egdaniel@google.com Add internal calls for updateCompressedBackendTexture.
2020-07-10 bungeman@google.com Fix Op tests when default typeface is empty.
2020-07-10 bsalomon@google.com Revert "Revert "Put top level FPs into their own functions""
2020-07-10 michaelludwig@google.com Apply paint color to alpha-only textures in drawEdgeAAImageSet
2020-07-10 brianosman@google.com Add SkCodecImageGenerator::getScaledDimensions
2020-07-10 mtklein@google.com pack windows ABI stack tightly

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/+doc/master/autoroll/README.md

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': 'f8a6b5b4b0d02895f70af4158c47c3069488a64a',
+  'skia_revision': '5160e8caa226213c77b2a5f98908aa4eeee75ef5',
 
   # 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

@@ -1,4 +1,4 @@
-Signature: b63f90d0cdd71df9edf7508619ff94ce
+Signature: e49c9c554a9e530ceeb05109f84c8c7b
 
 UNUSED LICENSES: