Expose FillBounds to allow GrPictureUtils::CollectLayers to be layered on top of it

include/core/SkPicture.h

Index: include/core/SkPicture.h
diff --git a/include/core/SkPicture.h b/include/core/SkPicture.h
index f0bdd914d5cb17bfc076b23af4a665868c4d24f5..0989889fb46e30809b9b9e6848ca7293ed8cac53 100644
--- a/include/core/SkPicture.h
+++ b/include/core/SkPicture.h
@@ -20,6 +20,7 @@
 class GrContext;
 #endif
 
+class GrAccelData;
 class GrReplacements;
 class SkBBoxHierarchy;
 class SkCanvas;
@@ -283,6 +284,7 @@ private:
     friend class SkRecords::CollectLayers;     // access to fRecord
     friend class SkPicturePlayback;            // to get fData
     friend class ReplaceDraw;
+    friend const GrAccelData* GPUOptimize(const SkPicture* pict);
 
     typedef SkRefCnt INHERITED;