Add asADash entry point into SkPathEffect to allow extracting Dash info from PathEffects

include/core/SkPicture.h

Index: include/core/SkPicture.h
diff --git a/include/core/SkPicture.h b/include/core/SkPicture.h
index bf9ec4f8bbb184e08d665a7abbc4dbe30892c414..996d85716ee4a9d62aa5198ed5b1d32faf1d919b 100644
--- a/include/core/SkPicture.h
+++ b/include/core/SkPicture.h
@@ -324,13 +324,14 @@ protected:
     // V22: SK_PICT_FACTORY_TAG's size is now the chunk size in bytes
     // V23: SkPaint::FilterLevel became a real enum
     // V24: SkTwoPointConicalGradient now has fFlipped flag for gradient flipping
+    // V25: SkDashPathEffect now only writes phase and interval array when flattening
 
     // 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 = 24;
+    static const uint32_t CURRENT_PICTURE_VERSION = 25;
 
     mutable uint32_t      fUniqueID;