Roll src/third_party/skia f4c66ccafcb7..a8ceb775c12f (3 commits) (#9015)

https://skia.googlesource.com/skia.git
/%2Blog/f4c66ccafcb7..a8ceb775c12f

git log f4c66ccafcb7fe62201cbe9a6eb72b09ef8a31da..a8ceb775c12f1516e11dd7463f0576d9fb26d524 --date=short --no-merges --format=%ad %ae %s
2019-05-20 mtklein@google.com Revert "remove SkMiniPicture and co."
2019-05-20 recipe-mega-autoroller@chops-service-accounts.iam.gserviceaccount.com Roll recipe dependencies (trivial).
2019-05-19 recipe-mega-autoroller@chops-service-accounts.iam.gserviceaccount.com Roll recipe dependencies (nontrivial).

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 (csmartdalton@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': 'f4c66ccafcb7fe62201cbe9a6eb72b09ef8a31da',
+  'skia_revision': 'a8ceb775c12f1516e11dd7463f0576d9fb26d524',
 
   # 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: c9641b16573a65d0dc1a5602bda8f488
+Signature: 5ce009dade753e3e007e865b0fb2037b
 
 UNUSED LICENSES:
 
@@ -3336,6 +3336,8 @@ FILE: ../../../third_party/skia/src/core/SkFontMgr.cpp
 FILE: ../../../third_party/skia/src/core/SkLatticeIter.cpp
 FILE: ../../../third_party/skia/src/core/SkLatticeIter.h
 FILE: ../../../third_party/skia/src/core/SkLocalMatrixImageFilter.cpp
+FILE: ../../../third_party/skia/src/core/SkMiniRecorder.cpp
+FILE: ../../../third_party/skia/src/core/SkMiniRecorder.h
 FILE: ../../../third_party/skia/src/core/SkNextID.h
 FILE: ../../../third_party/skia/src/core/SkOpts.cpp
 FILE: ../../../third_party/skia/src/core/SkOpts.h