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/extend.h b/av1/encoder/extend.h
new file mode 100644
index 0000000..1ad763e
--- /dev/null
+++ b/av1/encoder/extend.h
@@ -0,0 +1,31 @@
+/*
+ *  Copyright (c) 2010 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_EXTEND_H_
+#define VP10_ENCODER_EXTEND_H_
+
+#include "aom_scale/yv12config.h"
+#include "aom/vpx_integer.h"
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+void vp10_copy_and_extend_frame(const YV12_BUFFER_CONFIG *src,
+                                YV12_BUFFER_CONFIG *dst);
+
+void vp10_copy_and_extend_frame_with_rect(const YV12_BUFFER_CONFIG *src,
+                                          YV12_BUFFER_CONFIG *dst, int srcy,
+                                          int srcx, int srch, int srcw);
+#ifdef __cplusplus
+}  // extern "C"
+#endif
+
+#endif  // VP10_ENCODER_EXTEND_H_