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diff --git a/third_party/libwebrtc/webrtc/api/jsepsessiondescription.h b/third_party/libwebrtc/webrtc/api/jsepsessiondescription.h
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+++ b/third_party/libwebrtc/webrtc/api/jsepsessiondescription.h
@@ -0,0 +1,89 @@
+/*
+ *  Copyright 2012 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.
+ */
+
+// TODO(deadbeef): Move this out of api/; it's an implementation detail and
+// shouldn't be used externally.
+
+#ifndef API_JSEPSESSIONDESCRIPTION_H_
+#define API_JSEPSESSIONDESCRIPTION_H_
+
+#include <memory>
+#include <string>
+#include <vector>
+
+#include "api/candidate.h"
+#include "api/jsep.h"
+#include "api/jsepicecandidate.h"
+#include "rtc_base/constructormagic.h"
+
+namespace cricket {
+class SessionDescription;
+}
+
+namespace webrtc {
+
+// Implementation of SessionDescriptionInterface.
+class JsepSessionDescription : public SessionDescriptionInterface {
+ public:
+  explicit JsepSessionDescription(const std::string& type);
+  virtual ~JsepSessionDescription();
+
+  // Takes ownership of |description|.
+  // TODO(deadbeef): Make this use an std::unique_ptr<>, so ownership logic is
+  // more clear.
+  bool Initialize(cricket::SessionDescription* description,
+      const std::string& session_id,
+      const std::string& session_version);
+
+  virtual cricket::SessionDescription* description() {
+    return description_.get();
+  }
+  virtual const cricket::SessionDescription* description() const {
+    return description_.get();
+  }
+  virtual std::string session_id() const {
+    return session_id_;
+  }
+  virtual std::string session_version() const {
+    return session_version_;
+  }
+  virtual std::string type() const {
+    return type_;
+  }
+  // Allows changing the type. Used for testing.
+  void set_type(const std::string& type) { type_ = type; }
+  virtual bool AddCandidate(const IceCandidateInterface* candidate);
+  virtual size_t RemoveCandidates(
+      const std::vector<cricket::Candidate>& candidates);
+  virtual size_t number_of_mediasections() const;
+  virtual const IceCandidateCollection* candidates(
+      size_t mediasection_index) const;
+  virtual bool ToString(std::string* out) const;
+
+  static const int kDefaultVideoCodecId;
+  static const char kDefaultVideoCodecName[];
+
+ private:
+  std::unique_ptr<cricket::SessionDescription> description_;
+  std::string session_id_;
+  std::string session_version_;
+  std::string type_;
+  std::vector<JsepCandidateCollection> candidate_collection_;
+
+  bool GetMediasectionIndex(const IceCandidateInterface* candidate,
+                            size_t* index);
+  int GetMediasectionIndex(const cricket::Candidate& candidate);
+
+  RTC_DISALLOW_COPY_AND_ASSIGN(JsepSessionDescription);
+};
+
+}  // namespace webrtc
+
+#endif  // API_JSEPSESSIONDESCRIPTION_H_