Bump versionCode of SkyDemo.apk to avoid downgrade warning.

sky/tools/skydb

 #!/usr/bin/env python
 # Copyright 2014 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.
 
 from skypy.skyserver import SkyServer
 import argparse
 import json
 import logging
 import os
@@ skipping 208 matching lines @@
 
         self.pids['build_dir'] = self.paths.build_dir
         self.pids['sky_command_port'] = args.command_port
 
         if is_android:
             # TODO(eseidel): This should move into a helper method and handle
             # failures with nice messages explaining how to get root.
             subprocess.check_call([ADB_PATH, 'root'])
 
             # We could make installing conditional on an argument.
-            subprocess.check_call([ADB_PATH, 'install', '-r', apk_path])
+            # -r to replace an existing apk, -d to allow version downgrade.
+            subprocess.check_call([ADB_PATH, 'install', '-r', '-d', apk_path])
 
             port_string = 'tcp:%s' % sky_server.port
             subprocess.check_call([
                 ADB_PATH, 'reverse', port_string, port_string
             ])
             self.pids['remote_sky_server_port'] = sky_server.port
 
             port_string = 'tcp:%s' % args.command_port
             subprocess.check_call([
                 ADB_PATH, 'forward', port_string, port_string
@@ skipping 384 matching lines @@
         load_parser.set_defaults(func=self.load_command)
 
         args = parser.parse_args()
         args.func(args)
 
         self._write_pid_file(PID_FILE_PATH, self.pids)
 
 
 if __name__ == '__main__':
     SkyDebugger().main()