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diff --git a/third_party/libwebrtc/webrtc/rtc_base/sigslotrepeater.h b/third_party/libwebrtc/webrtc/rtc_base/sigslotrepeater.h
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+++ b/third_party/libwebrtc/webrtc/rtc_base/sigslotrepeater.h
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+/*
+ *  Copyright 2017 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.
+ */
+
+#ifndef RTC_BASE_SIGSLOTREPEATER_H__
+#define RTC_BASE_SIGSLOTREPEATER_H__
+
+// repeaters are both signals and slots, which are designed as intermediate
+// pass-throughs for signals and slots which don't know about each other (for
+// modularity or encapsulation).  This eliminates the need to declare a signal
+// handler whose sole purpose is to fire another signal.  The repeater connects
+// to the originating signal using the 'repeat' method.  When the repeated
+// signal fires, the repeater will also fire.
+//
+// TODO(deadbeef): Actually use this, after we decide on some style points on
+// using signals, so it doesn't get deleted again.
+
+#include "rtc_base/sigslot.h"
+
+namespace sigslot {
+
+template <class mt_policy, typename... Args>
+class repeater_with_thread_policy
+    : public signal_with_thread_policy<mt_policy, Args...>,
+      public has_slots<mt_policy> {
+ private:
+  // These typedefs are just to make the code below more readable. Code using
+  // repeaters shouldn't need to reference these types directly.
+  typedef signal_with_thread_policy<mt_policy, Args...> base_type;
+  typedef repeater_with_thread_policy<mt_policy, Args...> this_type;
+
+ public:
+  repeater_with_thread_policy() {}
+  repeater_with_thread_policy(const this_type& s) : base_type(s) {}
+
+  void reemit(Args... args) { base_type::emit(args...); }
+  void repeat(base_type& s) { s.connect(this, &this_type::reemit); }
+  void stop(base_type& s) { s.disconnect(this); }
+};
+
+// Alias with default thread policy. Needed because both default arguments
+// and variadic template arguments must go at the end of the list, so we
+// can't have both at once.
+template <typename... Args>
+using repeater =
+    repeater_with_thread_policy<SIGSLOT_DEFAULT_MT_POLICY, Args...>;
+
+}  // namespace sigslot
+
+#endif  // RTC_BASE_SIGSLOTREPEATER_H__