Roll Skia from a05dbd2a60f0 to 50378c58b60c (7 revisions) (#54789)

https://skia.googlesource.com/skia.git/+log/a05dbd2a60f0..50378c58b60c

2024-08-26 skia-autoroll@skia-public.iam.gserviceaccount.com Roll SK Tool from 1e4466d51783 to b53c019191d9
2024-08-26 skia-autoroll@skia-public.iam.gserviceaccount.com Roll skottie-base from eba2fc680652 to 345313f563b8
2024-08-26 fmalita@google.com [bazel] Use platform fontmgrs in font_tool_utils
2024-08-26 michaelludwig@google.com [graphite] Split up universal blend shader snippet
2024-08-26 robertphillips@google.com [graphite] Remove static initializer in MtlCaps
2024-08-26 michaelludwig@google.com [ganesh] Fix signature of GrGLMemoryBarrierFn
2024-08-26 bungeman@google.com [pdf] Avoid known image/profile channel mismatch

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 brianosman@google.com,egdaniel@google.com,jimgraham@google.com,rmistry@google.com 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://issues.skia.org/issues/new?component=1389291&template=1850622

Documentation for the AutoRoller is here:
https://skia.googlesource.com/buildbot/+doc/main/autoroll/README.md

Author: skia-flutter-autoroll

DEPS

@@ -14,7 +14,7 @@ vars = {
   'flutter_git': 'https://flutter.googlesource.com',
   'skia_git': 'https://skia.googlesource.com',
   'llvm_git': 'https://llvm.googlesource.com',
-  'skia_revision': 'a05dbd2a60f01a1ee76c89633001d54d18010772',
+  'skia_revision': '50378c58b60ca203788a599cfefec6bee434e461',
 
   # 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: 7cf116f9d344eb161bf5591991f65198
+Signature: 58ef8ad25f308988389c44fecfd55200
 
 ====================================================================================================
 LIBRARY: etc1