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diff --git a/chrome/browser/session_id.h b/chrome/browser/session_id.h
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+// Copyright 2008, Google Inc.
+// All rights reserved.
+//
+// Redistribution and use in source and binary forms, with or without
+// modification, are permitted provided that the following conditions are
+// met:
+//
+//    * Redistributions of source code must retain the above copyright
+// notice, this list of conditions and the following disclaimer.
+//    * Redistributions in binary form must reproduce the above
+// copyright notice, this list of conditions and the following disclaimer
+// in the documentation and/or other materials provided with the
+// distribution.
+//    * Neither the name of Google Inc. nor the names of its
+// contributors may be used to endorse or promote products derived from
+// this software without specific prior written permission.
+//
+// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+
+#ifndef CHROME_BROWSER_SESSION_ID_H_
+#define CHROME_BROWSER_SESSION_ID_H_
+
+// SessionID ------------------------------------------------------------------
+
+// Uniquely identifies a session, tab or window.
+
+class SessionID {
+  friend class SessionService;
+ public:
+  typedef int32 id_type;
+
+  SessionID();
+  ~SessionID() {}
+
+  // Returns the underlying id.
+  id_type id() const { return id_; }
+
+  // Returns true if the two commands are equal.
+  bool Equals(const SessionID& other) const;
+
+ private:
+  explicit SessionID(id_type id) : id_(id) {}
+
+  // Resets the id. This is used when restoring a session
+  void set_id(id_type id) { id_ = id; }
+
+  id_type id_;
+};
+
+#endif  // CHROME_BROWSER_SESSION_ID_H_