ImageBuffer-less SVG masking and clipping.

Source/core/platform/graphics/ImageBuffer.h

Index: Source/core/platform/graphics/ImageBuffer.h
diff --git a/Source/core/platform/graphics/ImageBuffer.h b/Source/core/platform/graphics/ImageBuffer.h
index b4c0af9f3398dd1bf1c444c0504560a68ecf1f4a..4afc7ade0b211cc000cd6dd585906389c65545c8 100644
--- a/Source/core/platform/graphics/ImageBuffer.h
+++ b/Source/core/platform/graphics/ImageBuffer.h
@@ -43,6 +43,7 @@
 #include "wtf/Vector.h"
 
 class SkCanvas;
+class SkColorFilter;
 
 namespace WebKit { class WebLayer; }
 
@@ -116,13 +117,10 @@ public:
 
     void putByteArray(Multiply multiplied, Uint8ClampedArray*, const IntSize& sourceSize, const IntRect& sourceRect, const IntPoint& destPoint, CoordinateSystem = LogicalCoordinateSystem);
 
-    void convertToLuminanceMask();
-
     String toDataURL(const String& mimeType, const double* quality = 0, CoordinateSystem = LogicalCoordinateSystem) const;
     AffineTransform baseTransform() const { return AffineTransform(); }
     void transformColorSpace(ColorSpace srcColorSpace, ColorSpace dstColorSpace);
-    static const Vector<uint8_t>& getLinearRgbLUT();
-    static const Vector<uint8_t>& getDeviceRgbLUT();
+    static PassRefPtr<SkColorFilter> createColorSpaceFilter(ColorSpace srcColorSpace, ColorSpace dstColorSpace);

[Stephen White, 2013/08/28 14:11:10]

I think to keep Skia types out of non-platform/ directories, we'll have to wrap
SkColorFilter in a (new) blink type, or move part of the SVG rendering code into
platform/, if possible.

[f(malita), 2013/08/28 19:54:38]

I made this private, currently only accessible from GraphicsContext &
SkiaImageFilterBuilder
(friend classes). Admittedly, this is not the ideal place for it - we should
find a better
home once ImageBuffer::transformColorSpace() gets retired and we can move the
lookup tables.

     WebKit::WebLayer* platformLayer() const;
 
     // FIXME: current implementations of this method have the restriction that they only work