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diff --git a/third_party/libwebrtc/api/call/call_factory_interface.h b/third_party/libwebrtc/api/call/call_factory_interface.h
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+++ b/third_party/libwebrtc/api/call/call_factory_interface.h
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+/*
+ *  Copyright 2017 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_CALL_CALL_FACTORY_INTERFACE_H_
+#define API_CALL_CALL_FACTORY_INTERFACE_H_
+
+#include <memory>
+
+#include "rtc_base/system/rtc_export.h"
+
+namespace webrtc {
+
+// These classes are not part of the API, and are treated as opaque pointers.
+class Call;
+struct CallConfig;
+
+// This interface exists to allow webrtc to be optionally built without media
+// support (i.e., if only being used for data channels). PeerConnectionFactory
+// is constructed with a CallFactoryInterface, which may or may not be null.
+class CallFactoryInterface {
+ public:
+  virtual ~CallFactoryInterface() {}
+
+  virtual Call* CreateCall(const CallConfig& config) = 0;
+};
+
+RTC_EXPORT std::unique_ptr<CallFactoryInterface> CreateCallFactory();
+
+}  // namespace webrtc
+
+#endif  // API_CALL_CALL_FACTORY_INTERFACE_H_