Add a control to set the ANS window size

Change-Id: I3d64ec4bbc72143b30a094ece7a6c711d6b479cd
diff --git a/av1/common/onyxc_int.h b/av1/common/onyxc_int.h
index 4315431..ca93bef 100644
--- a/av1/common/onyxc_int.h
+++ b/av1/common/onyxc_int.h
@@ -16,6 +16,9 @@
 #include "./av1_rtcd.h"
 #include "aom/internal/aom_codec_internal.h"
 #include "aom_util/aom_thread.h"
+#if CONFIG_ANS
+#include "aom_dsp/ans.h"
+#endif
 #include "av1/common/alloccommon.h"
 #include "av1/common/entropy.h"
 #include "av1/common/entropymode.h"
@@ -422,6 +425,9 @@
   int refresh_mask;
   int invalid_delta_frame_id_minus1;
 #endif
+#if CONFIG_ANS && ANS_MAX_SYMBOLS
+  int ans_window_size_log2;
+#endif
 } AV1_COMMON;
 
 #if CONFIG_REFERENCE_BUFFER