Plumb in flag to enable antialiased clipping in HTML 5 Canvas

Source/platform/graphics/GraphicsContext.cpp

Index: Source/platform/graphics/GraphicsContext.cpp
diff --git a/Source/platform/graphics/GraphicsContext.cpp b/Source/platform/graphics/GraphicsContext.cpp
index 8b118ee83df56bb2bddc68c8adc858cfb26771d3..3207525c0aa4360dc8429155bac0301d22bfebc9 100644
--- a/Source/platform/graphics/GraphicsContext.cpp
+++ b/Source/platform/graphics/GraphicsContext.cpp
@@ -1561,7 +1561,7 @@ void GraphicsContext::clipOutRoundedRect(const RoundedRect& rect)
     clipRoundedRect(rect, SkRegion::kDifference_Op);
 }
 
-void GraphicsContext::canvasClip(const Path& pathToClip, WindRule clipRule)
+void GraphicsContext::canvasClip(const Path& pathToClip, WindRule clipRule, AntiAliasingMode aa)
 {
     if (contextDisabled())
         return;
@@ -1572,7 +1572,7 @@ void GraphicsContext::canvasClip(const Path& pathToClip, WindRule clipRule)
 
     SkPath::FillType temporaryFillType = WebCoreWindRuleToSkFillType(clipRule);
     path.setFillType(temporaryFillType);
-    clipPath(path);
+    clipPath(path, aa);
 
     path.setFillType(previousFillType);
 }