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diff --git a/third_party/libwebrtc/api/test/mock_audio_mixer.h b/third_party/libwebrtc/api/test/mock_audio_mixer.h
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index 0000000000..88dc108ca3
--- /dev/null
+++ b/third_party/libwebrtc/api/test/mock_audio_mixer.h
@@ -0,0 +1,29 @@
+/*
+ *  Copyright (c) 2016 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_AUDIO_MIXER_H_
+#define API_TEST_MOCK_AUDIO_MIXER_H_
+
+#include "api/audio/audio_mixer.h"
+#include "test/gmock.h"
+
+namespace webrtc {
+namespace test {
+
+class MockAudioMixer : public AudioMixer {
+ public:
+  MOCK_METHOD(bool, AddSource, (Source*), (override));
+  MOCK_METHOD(void, RemoveSource, (Source*), (override));
+  MOCK_METHOD(void, Mix, (size_t number_of_channels, AudioFrame*), (override));
+};
+}  // namespace test
+}  // namespace webrtc
+
+#endif  // API_TEST_MOCK_AUDIO_MIXER_H_