* Roll CanvasKit to 0.25.1

* Update SkParagraph tests

The FlutterComputePlatformResolvedLocaleCallback does not pass the
standard user_data baton. This was an unintentional omission in the
original patch.

Add documentation to that effect and link to the bug report:
https://github.com/flutter/flutter/issues/79826

FlutterDesktopEngineCreate is part of our C API. We were using a C++
reference type instead of a C-compatible pointer type.

This is a breaking change to anyone calling this directly; we believe
this should affect few people because the Windows template only uses the
`FlutterEngine` wrapper in
`shell/platform/windows/client_wrapper/include/flutter/flutter_engine.h`.

Fixes https://github.com/flutter/flutter/issues/75465

Embedders making use of the embedder API always ended up with a
hardcoded log tag of "flutter". Some embedders may wish to set a
different log tag. For example, the Fuchsia embedder sets their log tag
to a launch URL followed by "flutter".

If unset, we continue to default to "flutter".

Fixes https://github.com/flutter/flutter/issues/79819

Previously messages logged from Dart code (e.g. via the print function)
were handled directly in the engine by platform-specific code. This
factors out a LogMessage(tag, message) callback that embedders can
implement with platform-specific code.

This also eliminates a dependency on platform-specific code in the core,
and provides more flexibility to embedders than the current fallback to
stdout, which can be a problem on platforms without a traditional stdout
or with restrictions on stdout.

Fixes https://github.com/flutter/flutter/issues/79685

Notify Skia that we've updated texture handles within the current
binding such that Skia invalidates any assumptions about previous
context modifications that it had made.

This fixes a texture corruption issue reported in
https://github.com/flutter/flutter/issues/78648