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diff --git a/dom/media/webrtc/transport/rlogconnector.h b/dom/media/webrtc/transport/rlogconnector.h
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+++ b/dom/media/webrtc/transport/rlogconnector.h
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+/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* vim: set ts=2 et sw=2 tw=80: */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this file,
+ * You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+// Some of this code is cut-and-pasted from nICEr. Copyright is:
+
+/*
+Copyright (c) 2007, Adobe Systems, Incorporated
+All rights reserved.
+
+Redistribution and use in source and binary forms, with or without
+modification, are permitted provided that the following conditions are
+met:
+
+* Redistributions of source code must retain the above copyright
+  notice, this list of conditions and the following disclaimer.
+
+* Redistributions in binary form must reproduce the above copyright
+  notice, this list of conditions and the following disclaimer in the
+  documentation and/or other materials provided with the distribution.
+
+* Neither the name of Adobe Systems, Network Resonance nor the names of its
+  contributors may be used to endorse or promote products derived from
+  this software without specific prior written permission.
+
+THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+"AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+(INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+*/
+
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this file,
+ * You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+/* Original author: bcampen@mozilla.com */
+
+/*
+   This file defines an r_dest_vlog that can be used to accumulate log messages
+   for later inspection/filtering. The intent is to use this for interactive
+   debug purposes on an about:webrtc page or similar.
+*/
+
+#ifndef rlogconnector_h__
+#define rlogconnector_h__
+
+#include <stdint.h>
+
+#include <deque>
+#include <string>
+#include <vector>
+
+#include "mozilla/Mutex.h"
+
+#include "m_cpp_utils.h"
+
+namespace mozilla {
+
+class RLogConnector {
+ public:
+  /*
+     NB: These are not threadsafe, nor are they safe to call during static
+     init/deinit.
+  */
+  static RLogConnector* CreateInstance();
+  static RLogConnector* GetInstance();
+  static void DestroyInstance();
+
+  /*
+     Retrieves log statements that match a given substring, subject to a
+     limit. |matching_logs| will be filled in chronological order (front()
+     is oldest, back() is newest). |limit| == 0 will be interpreted as no
+     limit.
+  */
+  void Filter(const std::string& substring, uint32_t limit,
+              std::deque<std::string>* matching_logs);
+
+  void FilterAny(const std::vector<std::string>& substrings, uint32_t limit,
+                 std::deque<std::string>* matching_logs);
+
+  inline void GetAny(uint32_t limit, std::deque<std::string>* matching_logs) {
+    Filter("", limit, matching_logs);
+  }
+
+  void SetLogLimit(uint32_t new_limit);
+  bool ShouldLog(int level) const;
+  void Log(int level, std::string&& log);
+  void Clear();
+
+  // Methods to signal when a PeerConnection exists in a Private Window.
+  void EnterPrivateMode();
+  void ExitPrivateMode();
+
+ private:
+  RLogConnector();
+  ~RLogConnector();
+  void RemoveOld();
+  void AddMsg(std::string&& msg);
+
+  static RLogConnector* instance;
+
+  /*
+   * Might be worthwhile making this a circular buffer, but I think it is
+   * preferable to take up as little space as possible if no logging is
+   * happening/the ringbuffer is not being used.
+   */
+  std::deque<std::string> log_messages_;
+  /* Max size of log buffer (should we use time-depth instead/also?) */
+  uint32_t log_limit_;
+  OffTheBooksMutex mutex_;
+  uint32_t disableCount_;
+
+  DISALLOW_COPY_ASSIGN(RLogConnector);
+};  // class RLogConnector
+
+}  // namespace mozilla
+
+#endif  // rlogconnector_h__