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diff --git a/third_party/libwebrtc/pc/local_audio_source.h b/third_party/libwebrtc/pc/local_audio_source.h
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+++ b/third_party/libwebrtc/pc/local_audio_source.h
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+/*
+ *  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_LOCAL_AUDIO_SOURCE_H_
+#define PC_LOCAL_AUDIO_SOURCE_H_
+
+#include "api/audio_options.h"
+#include "api/media_stream_interface.h"
+#include "api/notifier.h"
+#include "api/scoped_refptr.h"
+
+// LocalAudioSource implements AudioSourceInterface.
+// This contains settings for switching audio processing on and off.
+
+namespace webrtc {
+
+class LocalAudioSource : public Notifier<AudioSourceInterface> {
+ public:
+  // Creates an instance of LocalAudioSource.
+  static rtc::scoped_refptr<LocalAudioSource> Create(
+      const cricket::AudioOptions* audio_options);
+
+  SourceState state() const override { return kLive; }
+  bool remote() const override { return false; }
+
+  const cricket::AudioOptions options() const override { return options_; }
+
+  void AddSink(AudioTrackSinkInterface* sink) override {}
+  void RemoveSink(AudioTrackSinkInterface* sink) override {}
+
+ protected:
+  LocalAudioSource() {}
+  ~LocalAudioSource() override {}
+
+ private:
+  void Initialize(const cricket::AudioOptions* audio_options);
+
+  cricket::AudioOptions options_;
+};
+
+}  // namespace webrtc
+
+#endif  // PC_LOCAL_AUDIO_SOURCE_H_