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diff --git a/third_party/libwebrtc/pc/dtmf_sender.h b/third_party/libwebrtc/pc/dtmf_sender.h
new file mode 100644
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+++ b/third_party/libwebrtc/pc/dtmf_sender.h
@@ -0,0 +1,118 @@
+/*
+ *  Copyright 2012 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 PC_DTMF_SENDER_H_
+#define PC_DTMF_SENDER_H_
+
+#include <stdint.h>
+
+#include <string>
+
+#include "api/dtmf_sender_interface.h"
+#include "api/scoped_refptr.h"
+#include "api/sequence_checker.h"
+#include "api/task_queue/pending_task_safety_flag.h"
+#include "api/task_queue/task_queue_base.h"
+#include "pc/proxy.h"
+#include "rtc_base/ref_count.h"
+#include "rtc_base/thread_annotations.h"
+
+// DtmfSender is the native implementation of the RTCDTMFSender defined by
+// the WebRTC W3C Editor's Draft.
+// https://w3c.github.io/webrtc-pc/#rtcdtmfsender
+
+namespace webrtc {
+
+// This interface is called by DtmfSender to talk to the actual audio channel
+// to send DTMF.
+class DtmfProviderInterface {
+ public:
+  // Returns true if the audio sender is capable of sending DTMF. Otherwise
+  // returns false.
+  virtual bool CanInsertDtmf() = 0;
+  // Sends DTMF `code`.
+  // The `duration` indicates the length of the DTMF tone in ms.
+  // Returns true on success and false on failure.
+  virtual bool InsertDtmf(int code, int duration) = 0;
+
+ protected:
+  virtual ~DtmfProviderInterface() {}
+};
+
+class DtmfSender : public DtmfSenderInterface {
+ public:
+  static rtc::scoped_refptr<DtmfSender> Create(TaskQueueBase* signaling_thread,
+                                               DtmfProviderInterface* provider);
+
+  void OnDtmfProviderDestroyed();
+
+  // Implements DtmfSenderInterface.
+  void RegisterObserver(DtmfSenderObserverInterface* observer) override;
+  void UnregisterObserver() override;
+  bool CanInsertDtmf() override;
+  bool InsertDtmf(const std::string& tones,
+                  int duration,
+                  int inter_tone_gap,
+                  int comma_delay = kDtmfDefaultCommaDelayMs) override;
+  std::string tones() const override;
+  int duration() const override;
+  int inter_tone_gap() const override;
+  int comma_delay() const override;
+
+ protected:
+  DtmfSender(TaskQueueBase* signaling_thread, DtmfProviderInterface* provider);
+  virtual ~DtmfSender();
+
+  DtmfSender(const DtmfSender&) = delete;
+  DtmfSender& operator=(const DtmfSender&) = delete;
+
+ private:
+  DtmfSender();
+
+  void QueueInsertDtmf(uint32_t delay_ms) RTC_RUN_ON(signaling_thread_);
+
+  // The DTMF sending task.
+  void DoInsertDtmf() RTC_RUN_ON(signaling_thread_);
+
+  void StopSending() RTC_RUN_ON(signaling_thread_);
+
+  DtmfSenderObserverInterface* observer_ RTC_GUARDED_BY(signaling_thread_);
+  TaskQueueBase* const signaling_thread_;
+  DtmfProviderInterface* provider_ RTC_GUARDED_BY(signaling_thread_);
+  std::string tones_ RTC_GUARDED_BY(signaling_thread_);
+  int duration_ RTC_GUARDED_BY(signaling_thread_);
+  int inter_tone_gap_ RTC_GUARDED_BY(signaling_thread_);
+  int comma_delay_ RTC_GUARDED_BY(signaling_thread_);
+
+  // For cancelling the tasks which feed the DTMF provider one tone at a time.
+  rtc::scoped_refptr<PendingTaskSafetyFlag> safety_flag_ RTC_GUARDED_BY(
+      signaling_thread_) RTC_PT_GUARDED_BY(signaling_thread_) = nullptr;
+};
+
+// Define proxy for DtmfSenderInterface.
+BEGIN_PRIMARY_PROXY_MAP(DtmfSender)
+
+PROXY_PRIMARY_THREAD_DESTRUCTOR()
+PROXY_METHOD1(void, RegisterObserver, DtmfSenderObserverInterface*)
+PROXY_METHOD0(void, UnregisterObserver)
+PROXY_METHOD0(bool, CanInsertDtmf)
+PROXY_METHOD4(bool, InsertDtmf, const std::string&, int, int, int)
+PROXY_CONSTMETHOD0(std::string, tones)
+PROXY_CONSTMETHOD0(int, duration)
+PROXY_CONSTMETHOD0(int, inter_tone_gap)
+PROXY_CONSTMETHOD0(int, comma_delay)
+END_PROXY_MAP(DtmfSender)
+
+// Get DTMF code from the DTMF event character.
+bool GetDtmfCode(char tone, int* code);
+
+}  // namespace webrtc
+
+#endif  // PC_DTMF_SENDER_H_