Roll Skia from d445371afee5 to a30d857718ad (2 revisions) (flutter#173910)

https://skia.googlesource.com/skia.git/+log/d445371afee5..a30d857718ad

2025-08-16 skia-autoroll@skia-public.iam.gserviceaccount.com Manual roll
ANGLE from 63d8f74cdf9c to 806c80ece32b (6 revisions)
2025-08-16 skia-autoroll@skia-public.iam.gserviceaccount.com Manual roll
Dawn from 8f680a2a9cb9 to b639f97ad620 (8 revisions)

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
chinmaygarde@google.com,kjlubick@google.com,robertphillips@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: engine-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': 'd445371afee5ce3c307f416f8197c654831fa060',
+  'skia_revision': 'a30d857718ad1e8c98e3e63c921ae5cc8a7598cf',
 
   # WARNING: DO NOT EDIT canvaskit_cipd_instance MANUALLY
   # See `lib/web_ui/README.md` for how to roll CanvasKit to a new version.