First pass at pre-rendering saveLayers for GPU

src/gpu/GrPictureUtils.h

Index: src/gpu/GrPictureUtils.h
===================================================================
--- src/gpu/GrPictureUtils.h	(revision 14572)
+++ src/gpu/GrPictureUtils.h	(working copy)
@@ -66,10 +66,9 @@
         return gGPUID;
     }
 
-protected:
+private:
     SkTDArray<SaveLayerInfo> fSaveLayerInfo;
 
-private:
     typedef SkPicture::AccelData INHERITED;
 };