Plumb in flag to enable antialiased clipping in HTML 5 Canvas

Source/core/html/canvas/CanvasRenderingContext2D.cpp

Index: Source/core/html/canvas/CanvasRenderingContext2D.cpp
diff --git a/Source/core/html/canvas/CanvasRenderingContext2D.cpp b/Source/core/html/canvas/CanvasRenderingContext2D.cpp
index a1911e5990147f992e81a3511e0192d35fa2bb4a..afd51e39a3391b95b98778320848cb60372057c6 100644
--- a/Source/core/html/canvas/CanvasRenderingContext2D.cpp
+++ b/Source/core/html/canvas/CanvasRenderingContext2D.cpp
@@ -87,9 +87,10 @@ static bool contextLostRestoredEventsEnabled()
     return RuntimeEnabledFeatures::experimentalCanvasFeaturesEnabled();
 }
 
-CanvasRenderingContext2D::CanvasRenderingContext2D(HTMLCanvasElement* canvas, const Canvas2DContextAttributes* attrs, bool usesCSSCompatibilityParseMode)
+CanvasRenderingContext2D::CanvasRenderingContext2D(HTMLCanvasElement* canvas, const Canvas2DContextAttributes* attrs, bool usesCSSCompatibilityParseMode, bool antialiasClips)
     : CanvasRenderingContext(canvas)
     , m_usesCSSCompatibilityParseMode(usesCSSCompatibilityParseMode)
+    , m_antialiasClips(antialiasClips)
     , m_hasAlpha(!attrs || attrs->alpha())
     , m_isContextLost(false)
     , m_contextRestorable(true)
@@ -1113,7 +1114,7 @@ void CanvasRenderingContext2D::clipInternal(const Path& path, const String& wind
     }
 
     realizeSaves(c);
-    c->canvasClip(path, parseWinding(windingRuleString));
+    c->canvasClip(path, parseWinding(windingRuleString), m_antialiasClips);
     modifiableState().m_hasClip = true;
 }