Sketch splitting SkPicture into an interface and SkBigPicture.

src/core/SkRecordDraw.h

Index: src/core/SkRecordDraw.h
diff --git a/src/core/SkRecordDraw.h b/src/core/SkRecordDraw.h
index 7bbab81b5aeb479d84b4b26c66d99fdf978f6001..5b248cfbd5b3526fd7f5f9151170b3c3cb1608f3 100644
--- a/src/core/SkRecordDraw.h
+++ b/src/core/SkRecordDraw.h
@@ -9,6 +9,7 @@
 #define SkRecordDraw_DEFINED
 
 #include "SkBBoxHierarchy.h"
+#include "SkBigPicture.h"
 #include "SkCanvas.h"
 #include "SkMatrix.h"
 #include "SkRecord.h"
@@ -20,7 +21,7 @@ class SkLayerInfo;
 void SkRecordFillBounds(const SkRect& cullRect, const SkRecord&, SkBBoxHierarchy*);
 
 void SkRecordComputeLayers(const SkRect& cullRect, const SkRecord& record,
-                           const SkPicture::SnapshotArray*,
+                           const SkBigPicture::SnapshotArray*,
                            SkBBoxHierarchy* bbh, SkLayerInfo* data);
 
 // Draw an SkRecord into an SkCanvas.  A convenience wrapper around SkRecords::Draw.