Roll Skia from 0328e12ab195 to 50d78376d30c (3 revisions) (#39086)

https://skia.googlesource.com/skia.git/+log/0328e12ab195..50d78376d30c

2023-01-24 [email protected] [sksl] Prevent assignments to pipeline input variables
2023-01-24 [email protected] Improve Serialization_Typeface error message
2023-01-23 [email protected] Add RP codegen support for matrix-op-scalar.

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],[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

DEPS

@@ -18,7 +18,7 @@ vars = {
   'llvm_git': 'https://llvm.googlesource.com',
   # OCMock is for testing only so there is no google clone
   'ocmock_git': 'https://github.com/erikdoe/ocmock.git',
-  'skia_revision': '0328e12ab195f6ada1adcfeaa65fffe2eb1310d4',
+  'skia_revision': '50d78376d30c4edf9533faef1df2ec8cea51973f',
 
   # 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: efd4597a0b8e7ec0edf8a734fb79cb03
+Signature: 36f6c4323bd83a331b7cc57087a94e8f
 
 ====================================================================================================
 LIBRARY: etc1