[Android] Prepare build/android/ for catapult+devil.

build/android/incremental_install/create_install_script.py

 #!/usr/bin/env python
 
 # Copyright 2015 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.
 
 """Creates a script to run an "_incremental" .apk."""
 
 import argparse
 import os
 import pprint
 import sys
 
 sys.path.append(os.path.join(os.path.dirname(__file__), os.pardir))
 sys.path.append(os.path.join(os.path.dirname(__file__), os.pardir, 'gyp'))
 
-from pylib import constants
+from pylib.constants import host_paths
 from util import build_utils
 
 
 SCRIPT_TEMPLATE = """\
 #!/usr/bin/env python
 #
 # This file was generated by:
 #     //build/android/incremental_install/create_install_script.py
 
 import os
@@ skipping 90 matching lines @@
   return options
 
 
 def main(args):
   options = _ParseArgs(args)
 
   def relativize(path):
     script_dir = os.path.dirname(options.script_output_path)
     return path and os.path.relpath(path, script_dir)
 
-  installer_path = os.path.join(constants.DIR_SOURCE_ROOT, 'build', 'android',
+  installer_path = os.path.join(host_paths.DIR_SOURCE_ROOT, 'build', 'android',
                                 'incremental_install', 'installer.py')
   pformat = pprint.pformat
   template_args = {
       'cmd_path': pformat(relativize(installer_path)),
       'apk_path': pformat(relativize(options.apk_path)),
       'output_directory': pformat(relativize(options.output_directory)),
       'native_libs': pformat([relativize(p) for p in options.native_libs]),
       'dex_files': pformat([relativize(p) for p in options.dex_files]),
       'show_proguard_warning': pformat(options.show_proguard_warning),
       'splits': pformat([relativize(p) for p in options.splits]),
   }
 
   with open(options.script_output_path, 'w') as script:
     script.write(SCRIPT_TEMPLATE.format(**template_args))
 
   os.chmod(options.script_output_path, 0750)
 
   if options.depfile:
     build_utils.WriteDepfile(
         options.depfile,
         build_utils.GetPythonDependencies())
 
 
 if __name__ == '__main__':
   sys.exit(main(sys.argv[1:]))