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diff --git a/third_party/libwebrtc/rtc_tools/py_event_log_analyzer/misc.py b/third_party/libwebrtc/rtc_tools/py_event_log_analyzer/misc.py
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+++ b/third_party/libwebrtc/rtc_tools/py_event_log_analyzer/misc.py
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+#  Copyright (c) 2016 The WebRTC 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.
+"""Utility functions for calculating statistics.
+"""
+
+from __future__ import division
+import collections
+import sys
+
+
+def CountReordered(sequence_numbers):
+    """Returns number of reordered indices.
+
+  A reordered index is an index `i` for which sequence_numbers[i] >=
+  sequence_numbers[i + 1]
+  """
+    return sum(1 for (s1, s2) in zip(sequence_numbers, sequence_numbers[1:])
+               if s1 >= s2)
+
+
+def SsrcNormalizedSizeTable(data_points):
+    """Counts proportion of data for every SSRC.
+
+  Args:
+     data_points: list of pb_parse.DataPoint
+
+  Returns:
+     A dictionary mapping from every SSRC in the data points. The
+     value of an SSRC `s` is the proportion of sizes of packets with
+     SSRC `s` to the total size of all packets.
+
+  """
+    mapping = collections.defaultdict(int)
+    for point in data_points:
+        mapping[point.ssrc] += point.size
+    return NormalizeCounter(mapping)
+
+
+def NormalizeCounter(counter):
+    """Returns a normalized version of the dictionary `counter`.
+
+  Does not modify `counter`.
+
+  Returns:
+    A new dictionary, in which every value in `counter`
+    has been divided by the total to sum up to 1.
+  """
+    total = sum(counter.values())
+    return {key: counter[key] / total for key in counter}
+
+
+def Unwrap(data, mod):
+    """Returns `data` unwrapped modulo `mod`. Does not modify data.
+
+  Adds integer multiples of mod to all elements of data except the
+  first, such that all pairs of consecutive elements (a, b) satisfy
+  -mod / 2 <= b - a < mod / 2.
+
+  E.g. Unwrap([0, 1, 2, 0, 1, 2, 7, 8], 3) -> [0, 1, 2, 3,
+  4, 5, 4, 5]
+  """
+    lst = data[:]
+    for i in range(1, len(data)):
+        lst[i] = lst[i - 1] + (lst[i] - lst[i - 1] + mod // 2) % mod - (mod //
+                                                                        2)
+    return lst
+
+
+def SsrcDirections(data_points):
+    ssrc_is_incoming = {}
+    for point in data_points:
+        ssrc_is_incoming[point.ssrc] = point.incoming
+    return ssrc_is_incoming
+
+
+# Python 2/3-compatible input function
+if sys.version_info[0] <= 2:
+    get_input = raw_input  # pylint: disable=invalid-name
+else:
+    get_input = input  # pylint: disable=invalid-name