Add SkImage->draw() call with src and dst rects.

src/image/SkImagePriv.h

Index: src/image/SkImagePriv.h
diff --git a/src/image/SkImagePriv.h b/src/image/SkImagePriv.h
index fc14f67c585ca496d15532dfb19958e7ee776b18..2af8bbea92c49c98ebd45f4ca9f93271dec1ab24 100644
--- a/src/image/SkImagePriv.h
+++ b/src/image/SkImagePriv.h
@@ -39,6 +39,9 @@ extern SkImage* SkNewImageFromBitmap(const SkBitmap&, bool canSharePixelRef);
 extern void SkImagePrivDrawPicture(SkCanvas*, SkPicture*,
                                    SkScalar x, SkScalar y, const SkPaint*);
 
+extern void SkImagePrivDrawPicture(SkCanvas*, SkPicture*,
+                                   const SkRect*, const SkRect&, const SkPaint*);
+
 /**
  *  Return an SkImage whose contents are those of the specified picture. Note:
  *  The picture itself is unmodified, and may continue to be used for recording