[skia-sync] Merge upstream chrome/m150 bug fixes

[mattleibow]

Description

Automated upstream bug-fix sync for m150. Targeting release branch release/4.150.x (mono/skia release/4.150.x).

This pull request was produced by skia-upstream-sync.

Related issues

N/A — automated upstream synchronization.

Required skia PR

Requires mono/skia#344

Areas affected

• Managed API (binding/)
• Native / C API (externals/skia/src/c, include/c)
• Generated P/Invoke bindings
• Native dependency or Skia update
• Views & integrations
• Rendering output / visual behavior
• Performance
• Tests
• Build, packaging, or CI
• Documentation or samples

Changes

Advance the SkiaSharp product repo to the synced mono/skia fork at upstream
Skia chrome/m150 bug-fix HEAD. Release-line bug-fix mode — no version bump.

• Submodule pointer: externals/skia gitlink advanced
  b70519562e2d26d3cf56286d3a13ca25152cfae4 →
  64328ce83ff19e37d61169f2a0b761f2572f7b67 (the tested mono/skia merge commit).
• cgmanifest.json:
  • Skia commitHash b70519562e → 64328ce83f
  • upstream_merge_commit a81173f17b → 9c7b2dffb2 (chrome_milestone 150,
    upstream_ref chrome/m150 unchanged)
• Versions: unchanged. update_versions.py reported m150 -> m150, GATE
  PASSED — no version-file drift.
• Dependency metadata: skia-dependency-changes.json = changes: []. The
  only DEPS movement (task_drivers) is a CIPD condition:False infra dep, never
  checked out and not tracked in cgmanifest.json, so no manifest change.

Bindings / wrappers

regenerate_bindings.py reported no binding changes and no new generated
functions (GATE PASSED). No C API functions were added or changed upstream, so
no *.generated.cs, managed wrapper, or new test changes were required.
binding/SkiaSharp/SkiaSharp.csproj builds with 0 errors.

Testing

Native library rebuilt from source for linux/x64 and the full unfiltered
managed solution run against it — all hosts passed (test-exit-code.txt = 0):

Host	Failed	Passed	Skipped
SkiaSharp.Tests	0	5585	171
SkiaSharp.Tests.SingletonInit	0	1	0
SkiaSharp.Vulkan.Tests	0	2	5
SkiaSharp.Direct3D.Tests	0	2	3

All GpuPolicy-required Linux backends (Mesa softpipe/llvmpipe + lavapipe ICD)
initialized and executed. No required backend was skipped; remaining skips are
the existing platform/host-policy skips.

Reconciliation gates re-run against final HEAD and passed: update_versions.py
(GATE PASSED) and audit_fork_patches.py --validate (GATE PASSED, no TODO).
Parent gitlink verified equal to the tested mono/skia commit 64328ce83f.

Human review

• Merge sequence: merge the paired mono/skia PR first, then update this PR's
  submodule pointer to the resulting release/4.150.x commit before merging.
• Only linux/x64 was built and tested here; the Windows/macOS/Android/iOS/WASM
  CI matrix must pass before merge.
• No public API surface change — ABI is preserved (no *.generated.cs diff).

Checklist

• Tests added or updated when behavior required them, or the report explains why not
• Changes above lists all public API and behavioral changes or states that none changed
• Documentation follow-up filed, or no public API changed
• Companion mono/skia PR linked above and bindings regenerated

Last rendered by the sync workflow: 2026-08-18T13:40:10Z

[github-actions]

📦 Try the packages from this PR

Warning

Do not run these scripts without first reviewing the code in this PR.

Step 1 — Download the packages

bash / macOS / Linux:

curl -fsSL https://raw.githubusercontent.com/mono/SkiaSharp/main/scripts/get-skiasharp-pr.sh | bash -s -- 4704

PowerShell / Windows:

iex "& { $(irm https://raw.githubusercontent.com/mono/SkiaSharp/main/scripts/get-skiasharp-pr.ps1) } 4704"

Step 2 — Add the local NuGet source

dotnet nuget add source ~/.skiasharp/hives/pr-4704/packages --name skiasharp-pr-4704

More options

Option	Description
--successful-only / -SuccessfulOnly	Only use successful builds
--force / -Force	Overwrite previously downloaded packages
--list / -List	List available artifacts without downloading
--build-id ID / -BuildId ID	Download from a specific build

Or download manually from Azure Pipelines — look for the nuget artifact on the build for this PR.

Remove the source when you're done:

dotnet nuget remove source skiasharp-pr-4704