Roll src/third_party/skia 6b797fec83f0..2f08a4043b26 (8 commits) (#8501)

https://skia.googlesource.com/skia.git/%2Blog/6b797fec83f0..2f08a4043b26

git log 6b797fec83f05cd1c57e0d5505a0f69b9f753c78..2f08a4043b26370aa24f713f5960433af8dd398f --date=short --no-merges --format=%ad %ae %s
2019-04-08 gkaiser@google.com examples: Avoid undefined behavior
2019-04-08 reed@google.com undef guard for bitmap shader
2019-04-08 reed@google.com Introduce new factory for SkColorFilters
2019-04-08 herb@google.com Add maxDimension() to glyph
2019-04-08 recipe-mega-autoroller@chops-service-accounts.iam.gserviceaccount.com Roll recipe dependencies (trivial).
2019-04-08 csmartdalton@google.com Disable output swizzling from GrDisableColorXP
2019-04-08 brianosman@google.com Update SPIRV caching to use SkWriter32/SkReader32 and allow inspection
2019-04-08 skia-autoroll@skia-public.iam.gserviceaccount.com Roll skia/third_party/skcms 99740cdf2835..36eeb1311a72 (1 commits)

The AutoRoll server is located here: https://autoroll.skia.org/r/skia-flutter-autoroll

Documentation for the AutoRoller is here:
https://skia.googlesource.com/buildbot/+/master/autoroll/README.md

If the roll is causing failures, please contact the current sheriff (egdaniel@google.com), and stop
the roller if necessary.

DEPS

@@ -23,7 +23,7 @@ vars = {
   'fuchsia_git': 'https://fuchsia.googlesource.com',
   'github_git': 'https://github.com',
   'skia_git': 'https://skia.googlesource.com',
-  'skia_revision': '6b797fec83f05cd1c57e0d5505a0f69b9f753c78',
+  'skia_revision': '2f08a4043b26370aa24f713f5960433af8dd398f',
 
   # 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: 4d703499240d61f71bfebdfc7445f256
+Signature: b30e63bcfcd9fbf90fcec07c5afe0ca7
 
 UNUSED LICENSES: