Roll src/third_party/skia b9998cdceec7..b1a002e850e1 (13 commits) (#6626)

https://skia.googlesource.com/skia.git/+log/b9998cdceec7..b1a002e850e1

Created with:
  gclient setdep -r src/third_party/skia@b1a002e850e1

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': 'b9998cdceec748454c052eb6acb981dfbb731425',
+  'skia_revision': 'b1a002e850e136134c68a5199f4e32f3bca54162',
 
   # 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: 05b322e4e4efe8dd9093df9fb90184d5
+Signature: bd69c07fc708fecdda910a0509344e4d
 
 UNUSED LICENSES:
 
@@ -967,7 +967,6 @@ FILE: ../../../third_party/skia/src/core/SkColorSpace.cpp
 FILE: ../../../third_party/skia/src/core/SkColorSpacePriv.h
 FILE: ../../../third_party/skia/src/core/SkCpu.cpp
 FILE: ../../../third_party/skia/src/core/SkCpu.h
-FILE: ../../../third_party/skia/src/core/SkDeduper.h
 FILE: ../../../third_party/skia/src/core/SkExchange.h
 FILE: ../../../third_party/skia/src/core/SkFixed15.h
 FILE: ../../../third_party/skia/src/core/SkFuzzLogging.h