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diff --git a/third_party/libwebrtc/api/test/mock_video_track.h b/third_party/libwebrtc/api/test/mock_video_track.h
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+++ b/third_party/libwebrtc/api/test/mock_video_track.h
@@ -0,0 +1,69 @@
+/*
+ *  Copyright 2021 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_VIDEO_TRACK_H_
+#define API_TEST_MOCK_VIDEO_TRACK_H_
+
+#include <string>
+
+#include "api/media_stream_interface.h"
+#include "api/scoped_refptr.h"
+#include "rtc_base/ref_counted_object.h"
+#include "test/gmock.h"
+
+namespace webrtc {
+
+class MockVideoTrack
+    : public rtc::RefCountedObject<webrtc::VideoTrackInterface> {
+ public:
+  static rtc::scoped_refptr<MockVideoTrack> Create() {
+    return rtc::scoped_refptr<MockVideoTrack>(new MockVideoTrack());
+  }
+
+  // NotifierInterface
+  MOCK_METHOD(void,
+              RegisterObserver,
+              (ObserverInterface * observer),
+              (override));
+  MOCK_METHOD(void,
+              UnregisterObserver,
+              (ObserverInterface * observer),
+              (override));
+
+  // MediaStreamTrackInterface
+  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));
+
+  // VideoSourceInterface
+  MOCK_METHOD(void,
+              AddOrUpdateSink,
+              (rtc::VideoSinkInterface<VideoFrame> * sink,
+               const rtc::VideoSinkWants& wants),
+              (override));
+  // RemoveSink must guarantee that at the time the method returns,
+  // there is no current and no future calls to VideoSinkInterface::OnFrame.
+  MOCK_METHOD(void,
+              RemoveSink,
+              (rtc::VideoSinkInterface<VideoFrame> * sink),
+              (override));
+
+  // VideoTrackInterface
+  MOCK_METHOD(VideoTrackSourceInterface*, GetSource, (), (const, override));
+
+  MOCK_METHOD(ContentHint, content_hint, (), (const, override));
+  MOCK_METHOD(void, set_content_hint, (ContentHint hint), (override));
+};
+
+}  // namespace webrtc
+
+#endif  // API_TEST_MOCK_VIDEO_TRACK_H_