add SkShader::newWithColorFilter

include/core/SkShader.h

Index: include/core/SkShader.h
diff --git a/include/core/SkShader.h b/include/core/SkShader.h
index 4d3ac5c9efdd59116974ad202d936574c43a922c..60ef280d5ec37f8038fdec42b8820b5c3530bda5 100644
--- a/include/core/SkShader.h
+++ b/include/core/SkShader.h
@@ -15,6 +15,7 @@
 #include "SkPaint.h"
 #include "../gpu/GrColor.h"
 
+class SkColorFilter;
 class SkPath;
 class SkPicture;
 class SkXfermode;
@@ -309,6 +310,12 @@ public:
      *  The specified matrix will be applied before any matrix associated with this shader.
      */
     SkShader* newWithLocalMatrix(const SkMatrix&) const;
+
+    /**
+     *  Create a new shader that produces the same colors as invoking this shader and then applying
+     *  the colorfilter.
+     */
+    SkShader* newWithColorFilter(SkColorFilter*) const;
     
     //////////////////////////////////////////////////////////////////////////
     //  Factory methods for stock shaders