Allow custom blitters to be passed to SkDraw::drawPath

include/core/SkDraw.h

Index: include/core/SkDraw.h
diff --git a/include/core/SkDraw.h b/include/core/SkDraw.h
index 918f2335ea0ef60d776d6acdc3f6a79fd616cc9a..21d421004ac340fd5497a6f6e03cea0166613cdc 100644
--- a/include/core/SkDraw.h
+++ b/include/core/SkDraw.h
@@ -17,6 +17,7 @@
 class SkBitmap;
 class SkClipStack;
 class SkBaseDevice;
+class SkBlitter;
 class SkMatrix;
 class SkPath;
 class SkRegion;
@@ -49,8 +50,9 @@ public:
         this->drawPath(path, paint, prePathMatrix, pathIsMutable, false);
     }
 
-    void drawPath(const SkPath& path, const SkPaint& paint) const {
-        this->drawPath(path, paint, NULL, false, false);
+    void drawPath(const SkPath& path, const SkPaint& paint,
+                  SkBlitter* customBlitter = NULL) const {
+        this->drawPath(path, paint, NULL, false, false, customBlitter);
     }
 
     void    drawBitmap(const SkBitmap&, const SkMatrix&, const SkPaint&) const;
@@ -74,8 +76,9 @@ public:
      *
      *  Only device A8 is supported right now.
      */
-    void drawPathCoverage(const SkPath& src, const SkPaint& paint) const {
-        this->drawPath(src, paint, NULL, false, true);
+    void drawPathCoverage(const SkPath& src, const SkPaint& paint,
+                          SkBlitter* customBlitter = NULL) const {
+        this->drawPath(src, paint, NULL, false, true, customBlitter);
     }
 
     /** Helper function that creates a mask from a path and an optional maskfilter.
@@ -118,7 +121,8 @@ private:
     void    drawBitmapAsMask(const SkBitmap&, const SkPaint&) const;
 
     void    drawPath(const SkPath&, const SkPaint&, const SkMatrix* preMatrix,
-                     bool pathIsMutable, bool drawCoverage) const;
+                     bool pathIsMutable, bool drawCoverage,
+                     SkBlitter* customBlitter = NULL) const;
 
     /**
      *  Return the current clip bounds, in local coordinates, with slop to account