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diff --git a/third_party/libwebrtc/pc/sdp_utils.h b/third_party/libwebrtc/pc/sdp_utils.h
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+++ b/third_party/libwebrtc/pc/sdp_utils.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 PC_SDP_UTILS_H_
+#define PC_SDP_UTILS_H_
+
+#include <functional>
+#include <memory>
+#include <string>
+
+#include "api/jsep.h"
+#include "p2p/base/transport_info.h"
+#include "pc/session_description.h"
+#include "rtc_base/system/rtc_export.h"
+
+namespace webrtc {
+
+// Returns a copy of the given session description.
+RTC_EXPORT std::unique_ptr<SessionDescriptionInterface> CloneSessionDescription(
+    const SessionDescriptionInterface* sdesc);
+
+// Returns a copy of the given session description with the type changed.
+RTC_EXPORT std::unique_ptr<SessionDescriptionInterface>
+CloneSessionDescriptionAsType(const SessionDescriptionInterface* sdesc,
+                              SdpType type);
+
+// Function that takes a single session description content with its
+// corresponding transport and produces a boolean.
+typedef std::function<bool(const cricket::ContentInfo*,
+                           const cricket::TransportInfo*)>
+    SdpContentPredicate;
+
+// Returns true if the predicate returns true for all contents in the given
+// session description.
+bool SdpContentsAll(SdpContentPredicate pred,
+                    const cricket::SessionDescription* desc);
+
+// Returns true if the predicate returns true for none of the contents in the
+// given session description.
+bool SdpContentsNone(SdpContentPredicate pred,
+                     const cricket::SessionDescription* desc);
+
+// Function that takes a single session description content with its
+// corresponding transport and can mutate the content and/or the transport.
+typedef std::function<void(cricket::ContentInfo*, cricket::TransportInfo*)>
+    SdpContentMutator;
+
+// Applies the mutator function over all contents in the given session
+// description.
+void SdpContentsForEach(SdpContentMutator fn,
+                        cricket::SessionDescription* desc);
+
+}  // namespace webrtc
+
+#endif  // PC_SDP_UTILS_H_