Roll Skia from 6d0234673a40 to a1b44b72eb47 (3 revisions)

https://skia.googlesource.com/skia.git/+log/6d0234673a40..a1b44b72eb47

2021-10-06 [email protected] Migrate `SwitchCaseContainsExit` out of SkSLAnalysis.
2021-10-06 [email protected] Revert "change matrix_2x3 to row-major"
2021-10-06 [email protected] Allow tracking of Precompositions onEnter/onExit

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 [email protected] on the revert to ensure that a human
is aware of the problem.

To file a bug in Skia: https://bugs.chromium.org/p/skia/issues/entry
To file a bug in Flutter: https://github.com/flutter/flutter/issues/new/choose

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/+doc/main/autoroll/README.md

Author: skia-flutter-autoroll

DEPS

@@ -27,7 +27,7 @@ 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': '6d0234673a4073134416b8d2a60e0e93bed70369',
+  'skia_revision': 'a1b44b72eb4700c579dda974fc66c8642a046a7a',
 
   # WARNING: DO NOT EDIT canvaskit_cipd_instance MANUALLY
   # See `lib/web_ui/README.md` for how to roll CanvasKit to a new version.

ci/licenses_golden/licenses_skia

@@ -1,4 +1,4 @@
-Signature: 6d7bfeccebecd74353127061e6560e22
+Signature: 8d8fc5d3b9480f8938701e0513446bad
 
 UNUSED LICENSES:
 
@@ -3067,6 +3067,7 @@ FILE: ../../../third_party/skia/src/sksl/SkSLMangler.h
 FILE: ../../../third_party/skia/src/sksl/SkSLOperators.cpp
 FILE: ../../../third_party/skia/src/sksl/SkSLOperators.h
 FILE: ../../../third_party/skia/src/sksl/analysis/SkSLProgramVisitor.h
+FILE: ../../../third_party/skia/src/sksl/analysis/SwitchCaseContainsExit.cpp
 FILE: ../../../third_party/skia/src/sksl/ir/SkSLBinaryExpression.cpp
 FILE: ../../../third_party/skia/src/sksl/ir/SkSLBlock.cpp
 FILE: ../../../third_party/skia/src/sksl/ir/SkSLChildCall.cpp