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diff --git a/chrome/browser/sync/syncable/syncable_id.h b/chrome/browser/sync/syncable/syncable_id.h
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+++ b/chrome/browser/sync/syncable/syncable_id.h
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+// Copyright (c) 2009 The Chromium Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+#ifndef CHROME_BROWSER_SYNC_SYNCABLE_SYNCABLE_ID_H_
+#define CHROME_BROWSER_SYNC_SYNCABLE_SYNCABLE_ID_H_
+
+#include <iosfwd>
+#include <limits>
+#include <sstream>
+#include <string>
+
+#include "base/hash_tables.h"
+#include "chrome/browser/sync/util/fast_dump.h"
+#include "chrome/browser/sync/util/sync_types.h"
+
+extern "C" {
+struct sqlite3;
+struct sqlite3_stmt;
+}
+
+namespace syncable {
+class Id;
+}  // namespace syncable
+
+class MockConnectionManager;
+
+sqlite3_stmt* BindArg(sqlite3_stmt*, const syncable::Id&, int index);
+void GetColumn(sqlite3_stmt*, int index, syncable::Id* value);
+std::ostream& operator << (std::ostream& out, const syncable::Id& id);
+browser_sync::FastDump& operator <<
+  (browser_sync::FastDump& out, const syncable::Id& id);
+
+namespace syncable {
+
+// For historical reasons, 3 concepts got everloaded into the Id:
+// 1.  A unique, opaque identifier for the object.
+// 2.  Flag specifing whether server know about this object.
+// 3.  Flag for root.
+//
+// We originally wrapped an integer for this information, but now we use a
+// string. It will have one of three forms:
+// 1. c<client only opaque id> for client items that have not been committed.
+// 2. r for the root item.
+// 3. s<server provided opaque id> for items that the server knows about.
+class Id {
+  friend sqlite3_stmt* ::BindArg(sqlite3_stmt*, const syncable::Id&, int index);
+  friend void ::GetColumn(sqlite3_stmt*, int index, syncable::Id* value);
+  friend std::ostream& ::operator << (std::ostream& out,
+                                      const syncable::Id& id);
+  friend browser_sync::FastDump& ::operator <<
+    (browser_sync::FastDump& out, const syncable::Id& id);
+  friend class MockConnectionManager;
+  friend class SyncableIdTest;
+ public:
+  // This constructor will be handy even when we move away from
+  // int64s, just for unit tests.
+  inline Id() : s_("r") { }
+  inline Id(const Id& that) {
+    Copy(that);
+  }
+  inline Id& operator = (const Id& that) {
+    Copy(that);
+    return *this;
+  }
+  inline void Copy(const Id& that) {
+    this->s_ = that.s_;
+  }
+  inline bool IsRoot() const {
+    return "r" == s_;
+  }
+  inline bool ServerKnows() const {
+    return s_[0] == 's' || s_ == "r";
+  }
+
+  // TODO(sync): We could use null here, but to ease conversion we use "r".
+  // fix this, this is madness :)
+  inline bool IsNull() const {
+    return IsRoot();
+  }
+  inline void Clear() {
+    s_ = "r";
+  }
+  std::string AsQueryParam() const;
+  // Must never allow id == 0 or id < 0 to compile.
+  inline bool operator == (const Id& that) const {
+    return s_ == that.s_;
+  }
+  inline bool operator != (const Id& that) const {
+    return s_ != that.s_;
+  }
+  inline bool operator < (const Id& that) const {
+    return s_ < that.s_;
+  }
+  inline bool operator > (const Id& that) const {
+    return s_ > that.s_;
+  }
+
+ public:
+  // Three functions used to work with our proto buffers.
+  std::string GetServerId() const;
+  static Id CreateFromServerId(const std::string& server_id);
+  // This should only be used if you get back a reference to a local
+  // id from the server. Returns a client only opaque id.
+  static Id CreateFromClientString(const std::string& local_id);
+ protected:
+  std::string s_;
+};
+
+extern const Id kNullId;
+
+}  // namespace syncable
+
+#endif  // CHROME_BROWSER_SYNC_SYNCABLE_SYNCABLE_ID_H_