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diff --git a/third_party/libwebrtc/api/test/mock_media_stream_interface.h b/third_party/libwebrtc/api/test/mock_media_stream_interface.h
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+++ b/third_party/libwebrtc/api/test/mock_media_stream_interface.h
@@ -0,0 +1,134 @@
+/*
+ *  Copyright 2020 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 API_TEST_MOCK_MEDIA_STREAM_INTERFACE_H_
+#define API_TEST_MOCK_MEDIA_STREAM_INTERFACE_H_
+
+#include <string>
+
+#include "api/media_stream_interface.h"
+#include "test/gmock.h"
+
+namespace webrtc {
+
+class MockAudioSource : public rtc::RefCountedObject<AudioSourceInterface> {
+ public:
+  static rtc::scoped_refptr<MockAudioSource> Create() {
+    return rtc::scoped_refptr<MockAudioSource>(new MockAudioSource());
+  }
+
+  MOCK_METHOD(void,
+              RegisterObserver,
+              (ObserverInterface * observer),
+              (override));
+  MOCK_METHOD(void,
+              UnregisterObserver,
+              (ObserverInterface * observer),
+              (override));
+  MOCK_METHOD(SourceState, state, (), (const, override));
+  MOCK_METHOD(bool, remote, (), (const, override));
+  MOCK_METHOD(void, SetVolume, (double volume), (override));
+  MOCK_METHOD(void,
+              RegisterAudioObserver,
+              (AudioObserver * observer),
+              (override));
+  MOCK_METHOD(void,
+              UnregisterAudioObserver,
+              (AudioObserver * observer),
+              (override));
+  MOCK_METHOD(void, AddSink, (AudioTrackSinkInterface * sink), (override));
+  MOCK_METHOD(void, RemoveSink, (AudioTrackSinkInterface * sink), (override));
+  MOCK_METHOD(const cricket::AudioOptions, options, (), (const, override));
+
+ private:
+  MockAudioSource() = default;
+};
+
+class MockAudioTrack : public rtc::RefCountedObject<AudioTrackInterface> {
+ public:
+  static rtc::scoped_refptr<MockAudioTrack> Create() {
+    return rtc::scoped_refptr<MockAudioTrack>(new MockAudioTrack());
+  }
+
+  MOCK_METHOD(void,
+              RegisterObserver,
+              (ObserverInterface * observer),
+              (override));
+  MOCK_METHOD(void,
+              UnregisterObserver,
+              (ObserverInterface * observer),
+              (override));
+  MOCK_METHOD(std::string, kind, (), (const, override));
+  MOCK_METHOD(std::string, id, (), (const, override));
+  MOCK_METHOD(bool, enabled, (), (const, override));
+  MOCK_METHOD(bool, set_enabled, (bool enable), (override));
+  MOCK_METHOD(TrackState, state, (), (const, override));
+  MOCK_METHOD(AudioSourceInterface*, GetSource, (), (const, override));
+  MOCK_METHOD(void, AddSink, (AudioTrackSinkInterface * sink), (override));
+  MOCK_METHOD(void, RemoveSink, (AudioTrackSinkInterface * sink), (override));
+  MOCK_METHOD(bool, GetSignalLevel, (int* level), (override));
+  MOCK_METHOD(rtc::scoped_refptr<AudioProcessorInterface>,
+              GetAudioProcessor,
+              (),
+              (override));
+
+ private:
+  MockAudioTrack() = default;
+};
+
+class MockMediaStream : public MediaStreamInterface {
+ public:
+  MOCK_METHOD(std::string, id, (), (const override));
+  MOCK_METHOD(AudioTrackVector, GetAudioTracks, (), (override));
+  MOCK_METHOD(VideoTrackVector, GetVideoTracks, (), (override));
+  MOCK_METHOD(rtc::scoped_refptr<AudioTrackInterface>,
+              FindAudioTrack,
+              (const std::string& track_id),
+              (override));
+  MOCK_METHOD(rtc::scoped_refptr<VideoTrackInterface>,
+              FindVideoTrack,
+              (const std::string& track_id),
+              (override));
+  MOCK_METHOD(bool,
+              AddTrack,
+              (rtc::scoped_refptr<AudioTrackInterface> track),
+              (override));
+  MOCK_METHOD(bool,
+              AddTrack,
+              (rtc::scoped_refptr<VideoTrackInterface> track),
+              (override));
+  MOCK_METHOD(bool,
+              RemoveTrack,
+              (rtc::scoped_refptr<AudioTrackInterface> track),
+              (override));
+  MOCK_METHOD(bool,
+              RemoveTrack,
+              (rtc::scoped_refptr<VideoTrackInterface> track),
+              (override));
+  // Old AddTrack/RemoveTrack methods - slated for removal
+  MOCK_METHOD(bool, AddTrack, (AudioTrackInterface * track), (override));
+  MOCK_METHOD(bool, AddTrack, (VideoTrackInterface * track), (override));
+  MOCK_METHOD(bool, RemoveTrack, (AudioTrackInterface * track), (override));
+  MOCK_METHOD(bool, RemoveTrack, (VideoTrackInterface * track), (override));
+  MOCK_METHOD(void,
+              RegisterObserver,
+              (ObserverInterface * observer),
+              (override));
+  MOCK_METHOD(void,
+              UnregisterObserver,
+              (ObserverInterface * observer),
+              (override));
+};
+
+static_assert(!std::is_abstract_v<rtc::RefCountedObject<MockMediaStream>>, "");
+
+}  // namespace webrtc
+
+#endif  // API_TEST_MOCK_MEDIA_STREAM_INTERFACE_H_