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..dbfdd6ee9e25ede929598c4b24f3069170202737 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, bool antialias)
 {
     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, antialias ? AntiAliased : NotAntiAliased);

[Justin Novosad, 2014/10/14 14:46:43]

Since we already have this enumr this, we should use it rather than bool for the
antialias argument to this function. Same for
GraphicsRenderingContext2D::m_antialiasClips, etc. 
The rule in blink is that we use enum rather than bool whenever the argument
would be specified as a literal, which is not the case in any of the new code,
but since we have to convert here, we may as well convert to enum earlier.

[robertphillips, 2014/10/16 13:24:18]

Done.

 
     path.setFillType(previousFillType);
 }