[skia-sync] Update skia to milestone 149

[mattleibow]

Automated Skia milestone bump from m148 to m149.

Companion skia PR: mono/skia#252

mono/SkiaSharp PR Summary: Update Skia to milestone m149

Overview

Updates SkiaSharp to Skia milestone m149. The submodule externals/skia now points to
the skia-sync/m149 branch in mono/skia.

Changes

Version Files Updated

File	Change
scripts/VERSIONS.txt	milestone 148 → 149, soname 148.0.0 → 149.0.0, all NuGet version lines updated
cgmanifest.json	commitHash, chrome_milestone (149), upstream_merge_commit updated

Submodule Update

• externals/skia updated from 1a155bae3a (m148) to 2d0db2d5e8 (m149 merge)
• SK_C_INCREMENT = 0 (no new C API additions this milestone)

Bindings

• binding/SkiaSharp/SkiaApi.generated.cs: No changes — C API signatures unchanged
• HarfBuzz bindings: reverted (HarfBuzz updates are always separate)

Breaking Change Analysis (m148→m149)

All changes are either additive (new APIs) or Graphite-only (which SkiaSharp uses Ganesh, not Graphite).

Change	User Impact
SkCodec::Register removed	None — not exposed in C# API
SkShader::isOpaque() pure virtual	None — internal to Skia
SkFontMgr new match()/fallback()	None — not yet wrapped; no breaking change
New SkFontArguments tag constants	None — additive
Graphite GPU API changes	None — SkiaSharp uses Ganesh backend

No breaking changes to public SkiaSharp API. No [Obsolete] attributes needed.

Build Results

• Platform: Linux x64 (native build from source)
• Native build: ✅ Clean (libSkiaSharp.so, libHarfBuzzSharp.so)
• C# build: ✅ 0 errors, 0 warnings
• Note: Build used -stdlib=libstdc++ override due to missing libc++ headers on this runner;
  CI Docker containers use the proper libc++ setup via .NET cross-compilation images

Test Results

Suite	Passed	Skipped	Failed
SkiaSharp (smoke)	32	0	0
SkiaSharp (full)	5300	172	0
HarfBuzz	—	—	207 (pre-existing, see note)

Note on HarfBuzz failures: All 207 HarfBuzz test failures are pre-existing on main
(EntryPointNotFoundException: hb_blob_create_from_file). Confirmed by running the same
test against the m148 baseline — same failure. Not caused by this PR.

Skipped tests (172) are expected: GPU tests skipped without hardware, platform-specific
tests skipped on Linux, etc.

Items Needing Human Attention

1. HarfBuzz test failures (pre-existing): hb_blob_create_from_file entry point not found.
   This should be investigated separately as a potential HarfBuzz binding issue.

2. New SkFontMgr APIs: match(Request) and fallback(Request) are new in m149.
   Consider exposing via /api-add-review in a future PR for better font matching in SkiaSharp.

3. libc++ on CI runners: The automated build outside Docker requires libc++ headers.
   The actual CI pipeline uses Docker containers with proper libc++ setup — this is only
   an issue for local/agent builds outside the Docker environment.

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 -- 4141

PowerShell / Windows:

iex "& { $(irm https://raw.githubusercontent.com/mono/SkiaSharp/main/scripts/get-skiasharp-pr.ps1) } 4141"

Step 2 — Add the local NuGet source

dotnet nuget add source ~/.skiasharp/hives/pr-4141/packages --name skiasharp-pr-4141

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-4141

[github-actions]

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