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

av1/decoder/bitreader.h

diff --git a/av1/decoder/bitreader.h b/av1/decoder/bitreader.h
new file mode 100644
index 0000000..75d6aa4
--- /dev/null
+++ b/av1/decoder/bitreader.h
@@ -0,0 +1,38 @@
+/*
+ *  Copyright (c) 2016 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.
+ */
+
+/* The purpose of this header is to provide compile time pluggable bit reader
+ * implementations with a common interface. */
+
+#ifndef VPX10_DECODER_BITREADER_H_
+#define VPX10_DECODER_BITREADER_H_
+
+#include "./vpx_config.h"
+
+#if CONFIG_ANS
+#include "av1/common/ans.h"
+#include "aom/vp8dx.h"  // for vp10_decrypt_cb
+#define vp10_reader struct AnsDecoder
+#define vp10_reader_has_error ans_reader_has_error
+#define vp10_read uabs_read
+#define vp10_read_bit uabs_read_bit
+#define vp10_read_literal uabs_read_literal
+#define vp10_read_tree uabs_read_tree
+#else
+#include "aom_dsp/bitreader.h"
+#define vp10_reader vpx_reader
+#define vp10_reader_has_error vpx_reader_has_error
+#define vp10_read vpx_read
+#define vp10_read_bit vpx_read_bit
+#define vp10_read_literal vpx_read_literal
+#define vp10_read_tree vpx_read_tree
+#endif
+
+#endif  // VPX10_DECODER_BITREADER_H_