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diff --git a/chrome/browser/sync/engine/authenticator.h b/chrome/browser/sync/engine/authenticator.h
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+// Copyright (c) 2006-2009 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.
+
+// The authenticator is a cross-platform class that handles authentication for
+// the sync client.
+//
+// Current State:
+// The authenticator is currently only used to authenticate tokens using the
+// newer protocol buffer request.
+
+#ifndef CHROME_BROWSER_SYNC_ENGINE_AUTHENTICATOR_H_
+#define CHROME_BROWSER_SYNC_ENGINE_AUTHENTICATOR_H_
+
+#include <string>
+
+#include "base/basictypes.h"
+#include "base/port.h"
+
+namespace sync_pb {
+class UserIdentification;
+}
+
+namespace browser_sync {
+
+class ServerConnectionManager;
+class UserSettings;
+
+class Authenticator {
+ public:
+  // Single return enum.
+  enum AuthenticationResult {
+    SUCCESS = 0,
+    // We couldn't log on because we don't have saved credentials.
+    NO_SAVED_CREDENTIALS,
+    // We can't reach auth server (i.e. we're offline or server's down).
+    NOT_CONNECTED,
+    // Server's up, but we're down.
+    SERVICE_DOWN,
+    // We contacted the server, but the response didn't make sense.
+    CORRUPT_SERVER_RESPONSE,
+    // Bad username/password.
+    BAD_CREDENTIALS,
+    // Credentials are fine, but the user hasn't signed up.
+    USER_NOT_ACTIVATED,
+
+    // Return values for internal use.
+
+    // We will never return this to the user unless they call AuthenticateToken
+    // directly. Other auth functions retry and then return
+    // CORRUPT_SERVER_RESPONSE.
+    // TODO(sync): Implement retries.
+    BAD_AUTH_TOKEN,
+    // We should never return this, it's a placeholder during development.
+    // TODO(sync): Remove this
+    UNSPECIFIC_ERROR_RETURN,
+  };
+
+  // Constructor. This class will keep the connection authenticated.
+  // TODO(sync): Make it work as described.
+  // TODO(sync): Require a UI callback mechanism.
+  Authenticator(ServerConnectionManager* manager, UserSettings* settings);
+
+  // Constructor for a simple authenticator used for programmatic login from
+  // test programs.
+  explicit Authenticator(ServerConnectionManager* manager);
+
+  // This version of Authenticate tries to use saved credentials, if we have
+  // any.
+  AuthenticationResult Authenticate();
+
+  // If save_credentials is set we save the long-lived auth token to local disk.
+  // In all cases we save the username and password in memory (if given) so we
+  // can refresh the long-lived auth token if it expires.
+  // Also we save a 10-bit hash of the password to allow offline login.
+  // TODO(sync): Make it work as described.
+  // TODO(sync): Arguments for desired domain.
+  AuthenticationResult Authenticate(std::string username, std::string password,
+                                    bool save_credentials);
+  // A version of the auth token to authenticate cookie portion of
+  // authentication. It uses the new proto buffer based call instead of the HTTP
+  // GET based one we currently use.
+  // Can return one of SUCCESS, SERVICE_DOWN, CORRUPT_SERVER_RESPONSE,
+  // USER_NOT_ACTIVATED or BAD_AUTH_TOKEN. See above for the meaning of these
+  // values.
+  // TODO(sync): Make this function private when we're done.
+  AuthenticationResult AuthenticateToken(std::string auth_token);
+
+  const char * display_email() const { return display_email_.c_str(); }
+  const char * display_name() const { return display_name_.c_str(); }
+ private:
+  // Stores the information in the UserIdentification returned from the server.
+  AuthenticationResult HandleSuccessfulTokenRequest(
+      const sync_pb::UserIdentification* user);
+  // The server connection manager that we're looking after.
+  ServerConnectionManager* server_connection_manager_;
+  // Returns SUCCESS or the value that should be returned to the user.
+  std::string display_email_;
+  std::string display_name_;
+  std::string obfuscated_id_;
+  UserSettings* const settings_;
+};
+
+}  // namespace browser_sync
+
+#endif  // CHROME_BROWSER_SYNC_ENGINE_AUTHENTICATOR_H_