Import aom library

This is the reference implementation for the Alliance for Open Media's av1 video code.

The commit used was 4d668d7feb1f8abd809d1bca0418570a7f142a36.

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diff --git a/third_party/aom/aom_util/debug_util.h b/third_party/aom/aom_util/debug_util.h
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+/*
+ * Copyright (c) 2016, Alliance for Open Media. All rights reserved
+ *
+ * This source code is subject to the terms of the BSD 2 Clause License and
+ * the Alliance for Open Media Patent License 1.0. If the BSD 2 Clause License
+ * was not distributed with this source code in the LICENSE file, you can
+ * obtain it at www.aomedia.org/license/software. If the Alliance for Open
+ * Media Patent License 1.0 was not distributed with this source code in the
+ * PATENTS file, you can obtain it at www.aomedia.org/license/patent.
+ */
+
+#ifndef AOM_UTIL_DEBUG_UTIL_H_
+#define AOM_UTIL_DEBUG_UTIL_H_
+
+#include "./aom_config.h"
+#if CONFIG_DAALA_EC
+#include "aom_dsp/prob.h"
+#endif
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+/* This is a debug tool used to detect bitstream error. On encoder side, it
+ * pushes each bit and probability into a queue before the bit is written into
+ * the Arithmetic coder. On decoder side, whenever a bit is read out from the
+ * Arithmetic coder, it pops out the reference bit and probability from the
+ * queue as well. If the two results do not match, this debug tool will report
+ * an error.  This tool can be used to pin down the bitstream error precisely.
+ * By combining gdb's backtrace method, we can detect which module causes the
+ * bitstream error. */
+int bitstream_queue_get_write(void);
+int bitstream_queue_get_read(void);
+void bitstream_queue_record_write(void);
+void bitstream_queue_reset_write(void);
+#if CONFIG_DAALA_EC
+void bitstream_queue_pop(int *result, aom_cdf_prob *cdf, int *nsymbs);
+void bitstream_queue_push(int result, const aom_cdf_prob *cdf, int nsymbs);
+#else
+void bitstream_queue_pop(int *result, int *prob);
+void bitstream_queue_push(int result, int prob);
+#endif
+void bitstream_queue_set_skip_write(int skip);
+void bitstream_queue_set_skip_read(int skip);
+void bitstream_queue_set_frame_write(int frame_idx);
+int bitstream_queue_get_frame_write(void);
+void bitstream_queue_set_frame_read(int frame_idx);
+int bitstream_queue_get_frame_read(void);
+
+#ifdef __cplusplus
+}  // extern "C"
+#endif
+
+#endif  // AOM_UTIL_DEBUG_UTIL_H_