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diff --git a/third_party/aom/av1/encoder/context_tree.h b/third_party/aom/av1/encoder/context_tree.h
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+++ b/third_party/aom/av1/encoder/context_tree.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_AV1_ENCODER_CONTEXT_TREE_H_
+#define AOM_AV1_ENCODER_CONTEXT_TREE_H_
+
+#include "av1/common/blockd.h"
+#include "av1/encoder/block.h"
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+struct AV1_COMP;
+struct AV1Common;
+struct ThreadData;
+
+typedef enum {
+  // Search all the partition types in this plane.
+  SEARCH_FULL_PLANE = 0,
+  // Only search none_partition coding block.
+  NONE_PARTITION_PLANE = 1,
+  // Search all the partition types in this plane except split.
+  SEARCH_SAME_PLANE = 2,
+  // Skip search partition on this plane. Go split directly.
+  SPLIT_PLANE = 3,
+} CB_TREE_SEARCH;
+
+// Structure to hold snapshot of coding context during the mode picking process
+typedef struct {
+  MB_MODE_INFO mic;
+  MB_MODE_INFO_EXT mbmi_ext;
+  uint8_t *color_index_map[2];
+  uint8_t *blk_skip;
+
+  tran_low_t *coeff[MAX_MB_PLANE];
+  tran_low_t *qcoeff[MAX_MB_PLANE];
+  tran_low_t *dqcoeff[MAX_MB_PLANE];
+  uint16_t *eobs[MAX_MB_PLANE];
+  uint8_t *txb_entropy_ctx[MAX_MB_PLANE];
+
+  int num_4x4_blk;
+  int skip;
+  // For current partition, only if all Y, U, and V transform blocks'
+  // coefficients are quantized to 0, skippable is set to 1.
+  int skippable;
+  int best_mode_index;
+  int hybrid_pred_diff;
+  int comp_pred_diff;
+  int single_pred_diff;
+  // Skip certain ref frames during RD search of rectangular partitions.
+  int skip_ref_frame_mask;
+
+  // TODO(jingning) Use RD_COST struct here instead. This involves a boarder
+  // scope of refactoring.
+  int rate;
+  int64_t dist;
+  int64_t rdcost;
+  int rd_mode_is_ready;  // Flag to indicate whether rd pick mode decision has
+                         // been made.
+
+  // motion vector cache for adaptive motion search control in partition
+  // search loop
+  MV pred_mv[REF_FRAMES];
+  InterpFilter pred_interp_filter;
+  PARTITION_TYPE partition;
+} PICK_MODE_CONTEXT;
+
+typedef struct {
+  int valid;
+  int split;
+  int skip;
+  int64_t rdcost;
+  int sub_block_split[4];
+  int sub_block_skip[4];
+  int64_t sub_block_rdcost[4];
+} PC_TREE_STATS;
+
+typedef struct PC_TREE {
+  int index;
+  PARTITION_TYPE partitioning;
+  BLOCK_SIZE block_size;
+  PICK_MODE_CONTEXT none;
+  PICK_MODE_CONTEXT horizontal[2];
+  PICK_MODE_CONTEXT vertical[2];
+  PICK_MODE_CONTEXT horizontala[3];
+  PICK_MODE_CONTEXT horizontalb[3];
+  PICK_MODE_CONTEXT verticala[3];
+  PICK_MODE_CONTEXT verticalb[3];
+  PICK_MODE_CONTEXT horizontal4[4];
+  PICK_MODE_CONTEXT vertical4[4];
+  CB_TREE_SEARCH cb_search_range;
+  struct PC_TREE *split[4];
+  PC_TREE_STATS pc_tree_stats;
+} PC_TREE;
+
+void av1_setup_pc_tree(struct AV1Common *cm, struct ThreadData *td);
+void av1_free_pc_tree(struct ThreadData *td, const int num_planes);
+void av1_copy_tree_context(PICK_MODE_CONTEXT *dst_ctx,
+                           PICK_MODE_CONTEXT *src_ctx);
+
+#ifdef __cplusplus
+}  // extern "C"
+#endif
+
+#endif  // AOM_AV1_ENCODER_CONTEXT_TREE_H_