[Skia] Test fast/canvas/canvas-composite-stroke-alpha.html is failing

https://bugs.webkit.org/show_bug.cgi?id=273471

Reviewed by Carlos Garcia Campos.

This change fixes lack of blending on stroking.

* LayoutTests/platform/glib/TestExpectations:
* Source/WebCore/platform/graphics/skia/GraphicsContextSkia.cpp:
(WebCore::GraphicsContextSkia::createStrokePaint const):

Canonical link: https://commits.webkit.org/278743@main

LayoutTests/platform/glib/TestExpectations

@@ -1656,8 +1656,6 @@ webkit.org/b/273396 mathml/presentation/mo-stacked-glyphs.html [ ImageOnlyFailur
 webkit.org/b/273396 svg/animations/animateMotion-accumulate-1a.svg [ ImageOnlyFailure ]
 webkit.org/b/273396 svg/animations/animateMotion-accumulate-1b.svg [ ImageOnlyFailure ]
 
-webkit.org/b/273471 fast/canvas/canvas-composite-stroke-alpha.html [ Failure ]
-
 webkit.org/b/273472 fast/css3-text/font-synthesis.html [ ImageOnlyFailure ]
 
 webkit.org/b/273474 fast/text/emoji-variation-selector.html [ ImageOnlyFailure ]

Source/WebCore/platform/graphics/skia/GraphicsContextSkia.cpp

@@ -478,6 +478,7 @@ SkPaint GraphicsContextSkia::createStrokePaint() const
     SkPaint paint;
     paint.setAntiAlias(shouldAntialias());
     paint.setStyle(SkPaint::kStroke_Style);
+    paint.setBlendMode(toSkiaBlendMode(compositeMode().operation, blendMode()));
     paint.setStrokeCap(m_skiaState.m_stroke.cap);
     paint.setStrokeJoin(m_skiaState.m_stroke.join);
     paint.setStrokeMiter(m_skiaState.m_stroke.miter);