Adding an option to render only the shadow in SkDropShadowImageFilter

include/core/SkPicture.h

Index: include/core/SkPicture.h
diff --git a/include/core/SkPicture.h b/include/core/SkPicture.h
index ddf4551c67701a21cac33537320eb8975460c064..a83490dcbf07b826cc99cc1cec9225cf5f382038 100644
--- a/include/core/SkPicture.h
+++ b/include/core/SkPicture.h
@@ -243,13 +243,14 @@ private:
     // V34: Add SkTextBlob serialization.
     // V35: Store SkRect (rather then width & height) in header
     // V36: Remove (obsolete) alphatype from SkColorTable
+    // V37: Added shadow only option to SkDropShadowImageFilter
 
     // 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 = 36;
+    static const uint32_t CURRENT_PICTURE_VERSION = 37;
 
     mutable uint32_t      fUniqueID;