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/encoder/subexp.h b/av1/encoder/subexp.h
new file mode 100644
index 0000000..82ce2e0
--- /dev/null
+++ b/av1/encoder/subexp.h
@@ -0,0 +1,57 @@
+/*
+ *  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_ENCODER_SUBEXP_H_
+#define VP10_ENCODER_SUBEXP_H_
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+#include "aom_dsp/prob.h"
+
+struct vp10_writer;
+
+void vp10_write_prob_diff_update(struct vp10_writer *w, vpx_prob newp,
+                                 vpx_prob oldp);
+
+void vp10_cond_prob_diff_update(struct vp10_writer *w, vpx_prob *oldp,
+                                const unsigned int ct[2]);
+
+int vp10_prob_diff_update_savings_search(const unsigned int *ct, vpx_prob oldp,
+                                         vpx_prob *bestp, vpx_prob upd);
+
+int vp10_prob_diff_update_savings_search_model(const unsigned int *ct,
+                                               const vpx_prob *oldp,
+                                               vpx_prob *bestp, vpx_prob upd,
+                                               int stepsize);
+int vp10_cond_prob_diff_update_savings(vpx_prob *oldp,
+                                       const unsigned int ct[2]);
+
+#if CONFIG_ENTROPY
+int vp10_prob_update_search_subframe(unsigned int ct[][2], vpx_prob oldp,
+                                     vpx_prob *bestp, vpx_prob upd, int n);
+int vp10_prob_update_search_model_subframe(
+    unsigned int ct[ENTROPY_NODES][COEF_PROBS_BUFS][2], const vpx_prob *oldp,
+    vpx_prob *bestp, vpx_prob upd, int stepsize, int n);
+#endif  // CONFIG_ENTROPY
+
+//
+// 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.
+void vp10_write_primitive_symmetric(vp10_writer *w, int word,
+                                    unsigned int mag_bits);
+#ifdef __cplusplus
+}  // extern "C"
+#endif
+
+#endif  // VP10_ENCODER_SUBEXP_H_