Roll src/third_party/skia 9c37cd9..a631669 (12 commits) (flutter#6501)

https://skia.googlesource.com/skia.git/+log/9c37cd96e4c8..a631669e50a2


Created with:
  gclient setdep -r src/third_party/skia@a631669e50a2

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, who should
be CC'd on the roll, 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': '9c37cd96e4c8158643dbde6fd3eda1b42e267bec',
+  'skia_revision': 'a631669e50a206168d2956b6008bc9107c8ec5af',
 
   # 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: e6e4ae7d6d20cbfce295e960bdfe551c
+Signature: 0199dcdafd3495bf4b303746950b19ce
 
 UNUSED LICENSES:
 
@@ -2015,6 +2015,7 @@ FILE: ../../../third_party/skia/docs/overview.bmh
 FILE: ../../../third_party/skia/docs/status.json
 FILE: ../../../third_party/skia/docs/undocumented.bmh
 FILE: ../../../third_party/skia/docs/usingBookmaker.bmh
+FILE: ../../../third_party/skia/experimental/canvaskit/canvas-kit/cpu_example.html
 FILE: ../../../third_party/skia/experimental/canvaskit/canvas-kit/example.html
 FILE: ../../../third_party/skia/experimental/canvaskit/canvas-kit/package.json
 FILE: ../../../third_party/skia/experimental/canvaskit/externs.js
@@ -4697,6 +4698,7 @@ FILE: ../../../third_party/skia/fuzz/oss_fuzz/FuzzNullCanvas.cpp
 FILE: ../../../third_party/skia/fuzz/oss_fuzz/FuzzPNGEncoder.cpp
 FILE: ../../../third_party/skia/fuzz/oss_fuzz/FuzzPathMeasure.cpp
 FILE: ../../../third_party/skia/fuzz/oss_fuzz/FuzzPathop.cpp
+FILE: ../../../third_party/skia/fuzz/oss_fuzz/FuzzPolyUtils.cpp
 FILE: ../../../third_party/skia/fuzz/oss_fuzz/FuzzRasterN32Canvas.cpp
 FILE: ../../../third_party/skia/fuzz/oss_fuzz/FuzzTextBlobDeserialize.cpp
 FILE: ../../../third_party/skia/fuzz/oss_fuzz/FuzzWEBPEncoder.cpp