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diff --git a/third_party/libwebrtc/api/test/mock_data_channel.h b/third_party/libwebrtc/api/test/mock_data_channel.h
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--- /dev/null
+++ b/third_party/libwebrtc/api/test/mock_data_channel.h
@@ -0,0 +1,61 @@
+/*
+ *  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_DATA_CHANNEL_H_
+#define API_TEST_MOCK_DATA_CHANNEL_H_
+
+#include <string>
+
+#include "api/data_channel_interface.h"
+#include "test/gmock.h"
+
+namespace webrtc {
+
+class MockDataChannelInterface
+    : public rtc::RefCountedObject<webrtc::DataChannelInterface> {
+ public:
+  static rtc::scoped_refptr<MockDataChannelInterface> Create() {
+    return rtc::scoped_refptr<MockDataChannelInterface>(
+        new MockDataChannelInterface());
+  }
+
+  MOCK_METHOD(void,
+              RegisterObserver,
+              (DataChannelObserver * observer),
+              (override));
+  MOCK_METHOD(void, UnregisterObserver, (), (override));
+  MOCK_METHOD(std::string, label, (), (const, override));
+  MOCK_METHOD(bool, reliable, (), (const, override));
+  MOCK_METHOD(bool, ordered, (), (const, override));
+  MOCK_METHOD(uint16_t, maxRetransmitTime, (), (const, override));
+  MOCK_METHOD(uint16_t, maxRetransmits, (), (const, override));
+  MOCK_METHOD(absl::optional<int>, maxRetransmitsOpt, (), (const, override));
+  MOCK_METHOD(absl::optional<int>, maxPacketLifeTime, (), (const, override));
+  MOCK_METHOD(std::string, protocol, (), (const, override));
+  MOCK_METHOD(bool, negotiated, (), (const, override));
+  MOCK_METHOD(int, id, (), (const, override));
+  MOCK_METHOD(Priority, priority, (), (const, override));
+  MOCK_METHOD(DataState, state, (), (const, override));
+  MOCK_METHOD(RTCError, error, (), (const, override));
+  MOCK_METHOD(uint32_t, messages_sent, (), (const, override));
+  MOCK_METHOD(uint64_t, bytes_sent, (), (const, override));
+  MOCK_METHOD(uint32_t, messages_received, (), (const, override));
+  MOCK_METHOD(uint64_t, bytes_received, (), (const, override));
+  MOCK_METHOD(uint64_t, buffered_amount, (), (const, override));
+  MOCK_METHOD(void, Close, (), (override));
+  MOCK_METHOD(bool, Send, (const DataBuffer& buffer), (override));
+
+ protected:
+  MockDataChannelInterface() = default;
+};
+
+}  // namespace webrtc
+
+#endif  // API_TEST_MOCK_DATA_CHANNEL_H_