remove legacy filter-flags, and store FilterLevel directly

include/core/SkPicture.h

Index: include/core/SkPicture.h
diff --git a/include/core/SkPicture.h b/include/core/SkPicture.h
index 8d3061cd089ca8b4a56d853586f86f6e1567988a..9690469d9f13ef1f6513df2d481fd7e1e2f8de5b 100644
--- a/include/core/SkPicture.h
+++ b/include/core/SkPicture.h
@@ -309,13 +309,14 @@ protected:
     // V20: added bool to SkPictureImageFilter's serialization (to allow SkPicture serialization)
     // V21: add pushCull, popCull
     // V22: SK_PICT_FACTORY_TAG's size is now the chunk size in bytes
+    // V23: SkPaint::FilterLevel became a real enum
 
     // Note: If the picture version needs to be increased then please follow the
     // steps to generate new SKPs in (only accessible to Googlers): http://goo.gl/qATVcw
 
     // Only SKPs within the min/current picture version range (inclusive) can be read.
     static const uint32_t MIN_PICTURE_VERSION = 19;
-    static const uint32_t CURRENT_PICTURE_VERSION = 22;
+    static const uint32_t CURRENT_PICTURE_VERSION = 23;
 
     mutable uint32_t      fUniqueID;