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diff --git a/third_party/aom/av1/decoder/accounting.h b/third_party/aom/av1/decoder/accounting.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_ACCOUNTING_H_
+#define AOM_ACCOUNTING_H_
+#include <stdlib.h>
+
+#ifdef __cplusplus
+extern "C" {
+#endif // __cplusplus
+
+#define AOM_ACCOUNTING_HASH_SIZE (1021)
+
+/* Max number of entries for symbol types in the dictionary (increase as
+ necessary). */
+#define MAX_SYMBOL_TYPES (256)
+
+/*The resolution of fractional-precision bit usage measurements, i.e.,
+ 3 => 1/8th bits.*/
+#define AOM_ACCT_BITRES (3)
+
+typedef struct {
+ int16_t x;
+ int16_t y;
+} AccountingSymbolContext;
+
+typedef struct {
+ AccountingSymbolContext context;
+ uint32_t id;
+ /** Number of bits in units of 1/8 bit. */
+ uint32_t bits;
+ uint32_t samples;
+} AccountingSymbol;
+
+/** Dictionary for translating strings into id. */
+typedef struct {
+ char *(strs[MAX_SYMBOL_TYPES]);
+ int num_strs;
+} AccountingDictionary;
+
+typedef struct {
+ /** All recorded symbols decoded. */
+ AccountingSymbol *syms;
+ /** Number of syntax actually recorded. */
+ int num_syms;
+ /** Raw symbol decoding calls for non-binary values. */
+ int num_multi_syms;
+ /** Raw binary symbol decoding calls. */
+ int num_binary_syms;
+ /** Dictionary for translating strings into id. */
+ AccountingDictionary dictionary;
+} AccountingSymbols;
+
+typedef struct Accounting Accounting;
+
+struct Accounting {
+ AccountingSymbols syms;
+ /** Size allocated for symbols (not all may be used). */
+ int num_syms_allocated;
+ int16_t hash_dictionary[AOM_ACCOUNTING_HASH_SIZE];
+ AccountingSymbolContext context;
+ uint32_t last_tell_frac;
+};
+
+void aom_accounting_init(Accounting *accounting);
+void aom_accounting_reset(Accounting *accounting);
+void aom_accounting_clear(Accounting *accounting);
+void aom_accounting_set_context(Accounting *accounting, int16_t x, int16_t y);
+int aom_accounting_dictionary_lookup(Accounting *accounting, const char *str);
+void aom_accounting_record(Accounting *accounting, const char *str,
+ uint32_t bits);
+void aom_accounting_dump(Accounting *accounting);
+#ifdef __cplusplus
+} // extern "C"
+#endif // __cplusplus
+#endif // AOM_ACCOUNTING_H_