[skia-sync] Merge upstream chrome/m151 bug fixes

[mattleibow]

Automated upstream bug-fix sync for m151.

Companion skia PR: mono/skia#277

Sync SkiaSharp with upstream chrome/m151 (bug-fix only)

Mode: Same-milestone bug-fix sync (CURRENT == TARGET == m151, is_release == false).
No milestone/version bump — this only re-syncs the externals/skia submodule to pick up
2 new bug-fix commits merged into mono/skia's skiasharp branch.

Companion PR: mono/skia #NNN — Merge upstream chrome/m151 bug fixes
(created by the same automation run).

Breaking change analysis

None. The 2 upstream commits merged into mono/skia are:

SHA	Subject	SkiaSharp impact
1536d39750	Merge 3 release notes into RELEASE_NOTES.md	none (docs only)
ac3c0d3fcd	Filter unsupported CQ try jobs on chrome/m151	none (upstream CI config only)

No C++ API changes, no C API changes, no header changes, no DEPS changes, no
third-party dependency changes. SK_C_INCREMENT remains at 0.

Version updates

None — same-milestone sync. .agents/skills/update-skia/scripts/update-versions.ps1 -Current 151 -Target 151 was run and gated ✅ with output:

Same-milestone sync (m151 -> m151) — skipping stale-reference check
(only commitHash/upstream_merge_commit were updated)

• scripts/VERSIONS.txt — unchanged (milestone 151, increment 0, soname 151.0.0, nuget 4.151.0)
• scripts/azure-templates-variables.yml — unchanged (SKIASHARP_VERSION: 4.151.0)
• externals/skia/include/c/sk_types.h — SK_C_INCREMENT remains 0

Parent-repo changes (this PR)

File	Change
cgmanifest.json	mono/skia commitHash → de2e431eb3533193f077ad8a038a0a8239147db8
cgmanifest.json	upstream_merge_commit → 1536d3975057297af8087d22419f6c95dc96305d (upstream chrome/m151 tip)
externals/skia	submodule pointer → de2e431eb3 (new mono/skia merge commit)

Full parent-repo diff:

diff --git a/cgmanifest.json b/cgmanifest.json
@@ -216,7 +216,7 @@
           "repositoryUrl": "https://github.com/mono/skia.git",
-          "commitHash": "e1be35b25f2a32371d9a1924ef4d18e62ccff1f3"
+          "commitHash": "de2e431eb3533193f077ad8a038a0a8239147db8"
@@ -231,7 +231,7 @@
       "chrome_milestone": 151,
-      "upstream_merge_commit": "79e2e1538e94bb1d6b5bbbc56279036aa7574b10"
+      "upstream_merge_commit": "1536d3975057297af8087d22419f6c95dc96305d"

diff --git a/externals/skia b/externals/skia
-Subproject commit e1be35b25f2a32371d9a1924ef4d18e62ccff1f3
+Subproject commit de2e431eb3533193f077ad8a038a0a8239147db8

Bindings regeneration

.agents/skills/update-skia/scripts/regenerate-bindings.ps1 was run and reported:

--- Binding diff summary ---
No changes to bindings (C API signatures unchanged)
--- New generated functions (may need C# wrappers) ---
No new functions found
✅ Phase 8 complete

binding/SkiaSharp/SkiaApi.generated.cs, binding/SkiaSharp.Skottie/SkottieApi.generated.cs,
binding/SkiaSharp.SceneGraph/SceneGraphApi.generated.cs, and
binding/SkiaSharp.Resources/ResourcesApi.generated.cs regenerated with no diff.
HarfBuzz bindings reverted (as always in a Skia sync).

Phase 9 verification also clean:

git diff origin/main -- binding/SkiaSharp/SkiaApi.generated.cs | grep "^+.*internal static"
# (no output)

C# wrapper changes

None. No new C API functions → no wrappers needed.

Build & test results (Linux x64)

Step	Result
dotnet cake --target=externals-linux --arch=x64	✅ Success in 15m 51s (libSkiaSharp.so.151.0.0, libHarfBuzzSharp.so.0.61421.0 built)
dotnet build binding/SkiaSharp/SkiaSharp.csproj	✅ 0 errors, 0 warnings (38.3 s)
Full test suite	✅ Passed: 5584, Failed: 0, Skipped: 172, Total: 5756 (~2m 36s)

Full test output is uploaded as workflow artifact test-output.txt.
Native build log is uploaded as workflow artifact native-build.log.

Items needing human attention

None. This is a pure bug-fix sync with no code changes, no conflicts, no C API
work, no new upstream gn args, and a fully green build + test run. Cross-platform CI
on this PR will validate Windows/macOS/iOS/Android/WASM builds as usual.

Notes

• Only Linux x64 was built in the automation runner. The upstream commits merged
  touch only release notes and CI infra, so cross-platform impact is zero.
• The sandbox runner had an unrelated environmental patch on
  externals/depot_tools/gclient_paths.py (@functools.lru_cache → @functools.lru_cache()
  for older Python compatibility). It was deliberately not committed as it's not part of
  this sync.

Created by skia-upstream-sync.

[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 -- 4308

PowerShell / Windows:

iex "& { $(irm https://raw.githubusercontent.com/mono/SkiaSharp/main/scripts/get-skiasharp-pr.ps1) } 4308"

Step 2 — Add the local NuGet source

dotnet nuget add source ~/.skiasharp/hives/pr-4308/packages --name skiasharp-pr-4308

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-4308

[github-actions]

📖 Documentation Preview

The documentation for this PR has been deployed and is available at:

🔗 View Staging Site
🔗 View Staging Docs
🔗 View Staging Gallery (Blazor)
🔗 View Staging Gallery (Uno Platform)
🔗 View Staging SkiaFiddle

This preview will be updated automatically when you push new commits to this PR.

---

This comment is automatically updated by the documentation staging workflow.

[mattleibow]

Closing: this was a validation run for the versions.json-driven rotation change (#4306), not a real sync. Deleting the branch.