Roll Skia from 491301f393d1 to 50cf67910462 (3 revisions) (#190294)

https://skia.googlesource.com/skia.git/+log/491301f393d1..50cf67910462

2026-07-30 borenet@google.com Revert "[infra] Cleanup after removing
Upload tasks"
2026-07-30 borenet@google.com [infra] Cleanup after removing Upload
tasks
2026-07-30 lehoangquyen@chromium.org graphite/dawn: support true Discard
load/store ops

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 aaclarke@google.com,bwils@google.com,kjlubick@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
diff --git a/DEPS b/DEPS
index f346407..416c8f3 100644
--- a/DEPS
+++ b/DEPS
@@ -16,7 +16,7 @@
   'skia_git': 'https://skia.googlesource.com',
   'llvm_git': 'https://llvm.googlesource.com',
   'dart_ai_rev': '9c96bfe5f091c9451eff5b59c9bffeb2e806b875',
-  'skia_revision': '491301f393d120cd1ffcfe659b67375a80c70e81',
+  'skia_revision': '50cf67910462acc1e5b6474d0ec9d5f35e44c54c',
 
   # Do not download the Emscripten SDK by default.
   # This prevents us from downloading the Emscripten toolchain for builds