add endRecordingAsDrawable experiment

include/core/SkPicture.h

Index: include/core/SkPicture.h
diff --git a/include/core/SkPicture.h b/include/core/SkPicture.h
index 4db64bf93d80ff594effa0a0a156300a6bebf108..285a61613873817540252ebb4740d823216925db 100644
--- a/include/core/SkPicture.h
+++ b/include/core/SkPicture.h
@@ -276,7 +276,7 @@ private:
     const SkRect                          fCullRect;
     mutable SkAutoTUnref<const AccelData> fAccelData;
     mutable SkTDArray<DeletionListener*> fDeletionListeners;  // pointers are refed
-    SkAutoTDelete<const SkRecord>       fRecord;
+    SkAutoTUnref<const SkRecord>       fRecord;
     SkAutoTUnref<const SkBBoxHierarchy> fBBH;
     SkAutoTDelete<const SnapshotArray>  fDrawablePicts;
 
@@ -306,6 +306,7 @@ private:
     friend class GrLayerHoister;               // access to fRecord
     friend class ReplaceDraw;
     friend class SkPictureUtils;
+    friend class SkRecordedDrawable;
 };
 SK_COMPILE_ASSERT(sizeof(SkPicture) <= 96, SkPictureSize);