Port folder renaming changes from AOM

Manually cherry-picked commits:
ceef058 libvpx->libaom part2
3d26d91 libvpx -> libaom
cfea7dd vp10/ -> av1/
3a8eff7 Fix a build issue for a test
bf4202e Rename vpx to aom

Change-Id: I1b0eb5a40796e3aaf41c58984b4229a439a597dc
diff --git a/av1/decoder/dsubexp.h b/av1/decoder/dsubexp.h
new file mode 100644
index 0000000..b8980f7
--- /dev/null
+++ b/av1/decoder/dsubexp.h
@@ -0,0 +1,31 @@
+/*
+ *  Copyright (c) 2013 The WebM project authors. All Rights Reserved.
+ *
+ *  Use of this source code is governed by a BSD-style license
+ *  that can be found in the LICENSE file in the root of the source
+ *  tree. An additional intellectual property rights grant can be found
+ *  in the file PATENTS.  All contributing project authors may
+ *  be found in the AUTHORS file in the root of the source tree.
+ */
+
+#ifndef VP10_DECODER_DSUBEXP_H_
+#define VP10_DECODER_DSUBEXP_H_
+
+#include "av1/decoder/bitreader.h"
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+void vp10_diff_update_prob(vp10_reader *r, vpx_prob *p);
+
+#ifdef __cplusplus
+}  // extern "C"
+#endif
+
+// mag_bits is number of bits for magnitude. The alphabet is of size
+// 2 * 2^mag_bits + 1, symmetric around 0, where one bit is used to
+// indicate 0 or non-zero, mag_bits bits are used to indicate magnitide
+// and 1 more bit for the sign if non-zero.
+int vp10_read_primitive_symmetric(vp10_reader *r, unsigned int mag_bits);
+#endif  // VP10_DECODER_DSUBEXP_H_