Roll src/third_party/skia 8fec4140f614..9e0afb791ac2 (4 commits) (flutter#14563)

https://skia.googlesource.com/skia.git/+log/8fec4140f614..9e0afb791ac2

git log 8fec4140f614..9e0afb791ac2 --date=short --first-parent --format='%ad %ae %s'
2019-12-19 jiancai@google.com Fix clang warnings
2019-12-19 recipe-mega-autoroller@chops-service-accounts.iam.gserviceaccount.com Roll recipe dependencies (trivial).
2019-12-18 reed@google.com hide/remove obsolete/tricky SkMatrix methods
2019-12-18 reed@google.com Detect when perspective is really affine, and update the matrix as we handoff the ctm to the device.

Created with:
  gclient setdep -r src/third_party/skia@9e0afb791ac2

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 borenet@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: borenet@google.com

Author: skia-flutter-autoroll

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': '8fec4140f614aae4316f386b852c60e1cfa04f00',
+  'skia_revision': '9e0afb791ac27b5ea5825fcf1bbdddd979ff20a6',
 
   # 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: 9711a332eacc05c13292bd2d25e6839f
+Signature: 478a2e454ac0c63fde4c421adb33fa9f
 
 UNUSED LICENSES:
 
@@ -4391,12 +4391,9 @@ FILE: ../../../third_party/skia/docs/examples/Matrix_SetAffineIdentity.cpp
 FILE: ../../../third_party/skia/docs/examples/Matrix_TypeMask.cpp
 FILE: ../../../third_party/skia/docs/examples/Matrix_array_operator.cpp
 FILE: ../../../third_party/skia/docs/examples/Matrix_asAffine.cpp
-FILE: ../../../third_party/skia/docs/examples/Matrix_cheapEqualTo.cpp
 FILE: ../../../third_party/skia/docs/examples/Matrix_decomposeScale.cpp
 FILE: ../../../third_party/skia/docs/examples/Matrix_dirtyMatrixTypeCache.cpp
 FILE: ../../../third_party/skia/docs/examples/Matrix_dump.cpp
-FILE: ../../../third_party/skia/docs/examples/Matrix_equal_operator.cpp
-FILE: ../../../third_party/skia/docs/examples/Matrix_fixedStepInX.cpp
 FILE: ../../../third_party/skia/docs/examples/Matrix_get.cpp
 FILE: ../../../third_party/skia/docs/examples/Matrix_get9.cpp
 FILE: ../../../third_party/skia/docs/examples/Matrix_getMaxScale.cpp
@@ -4414,7 +4411,6 @@ FILE: ../../../third_party/skia/docs/examples/Matrix_getType.cpp
 FILE: ../../../third_party/skia/docs/examples/Matrix_hasPerspective.cpp
 FILE: ../../../third_party/skia/docs/examples/Matrix_invert.cpp
 FILE: ../../../third_party/skia/docs/examples/Matrix_isFinite.cpp
-FILE: ../../../third_party/skia/docs/examples/Matrix_isFixedStepInX.cpp
 FILE: ../../../third_party/skia/docs/examples/Matrix_isIdentity.cpp
 FILE: ../../../third_party/skia/docs/examples/Matrix_isScaleTranslate.cpp
 FILE: ../../../third_party/skia/docs/examples/Matrix_isSimilarity.cpp
@@ -4434,7 +4430,6 @@ FILE: ../../../third_party/skia/docs/examples/Matrix_mapVectors.cpp
 FILE: ../../../third_party/skia/docs/examples/Matrix_mapVectors_2.cpp
 FILE: ../../../third_party/skia/docs/examples/Matrix_mapXY.cpp
 FILE: ../../../third_party/skia/docs/examples/Matrix_mapXY_2.cpp
-FILE: ../../../third_party/skia/docs/examples/Matrix_notequal_operator.cpp
 FILE: ../../../third_party/skia/docs/examples/Matrix_postConcat.cpp
 FILE: ../../../third_party/skia/docs/examples/Matrix_postRotate.cpp
 FILE: ../../../third_party/skia/docs/examples/Matrix_postRotate_2.cpp