Update Android build to API level 17 and SDK Tools version 21

build/android/process_resources.py

 #!/usr/bin/env python
 #
 # Copyright (c) 2012 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.
 
 """Process Android library resources to generate R.java and crunched images."""
 
 import optparse
 import os
@@ skipping 45 matching lines @@
   # generated by merging the resources from all libraries and the main apk
   # project.
   subprocess.check_call([aapt,
                          'package',
                          '-m',
                          '--non-constant-id',
                          '--custom-package', options.R_package,
                          '-M', dummy_manifest,
                          '-S', options.res_dir,
                          '-I', android_jar,
+                         '--output-text-symbols', options.R_dir,
                          '-J', options.R_dir])
 
   # Crunch image resources. This shrinks png files and is necessary for 9-patch
   # images to display correctly.
   subprocess.check_call([aapt,
                          'crunch',
                          '-S', options.res_dir,
                          '-C', options.crunched_res_dir])
 
 
 if __name__ == '__main__':
   main()