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

build/android/pylib/base/base_setup.py

 # Copyright (c) 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.
 
 """Base script for doing test setup."""
 
 import logging
 import os
 
 from pylib import constants
 from pylib import valgrind_tools
+from pylib.constants import host_paths
 from pylib.utils import isolator
 
 def GenerateDepsDirUsingIsolate(suite_name, isolate_file_path,
                                 isolate_file_paths, deps_exclusion_list):
   """Generate the dependency dir for the test suite using isolate.
 
   Args:
     suite_name: Name of the test suite (e.g. base_unittests).
     isolate_file_path: .isolate file path to use. If there is a default .isolate
                        file path for the suite_name, this will override it.
     isolate_file_paths: Dictionary with the default .isolate file paths for
                         the test suites.
     deps_exclusion_list: A list of files that are listed as dependencies in the
                          .isolate files but should not be pushed to the device.
   Returns:
     The Isolator instance used to remap the dependencies, or None.
   """
   if isolate_file_path:
     if os.path.isabs(isolate_file_path):
       isolate_abs_path = isolate_file_path
     else:
-      isolate_abs_path = os.path.join(constants.DIR_SOURCE_ROOT,
+      isolate_abs_path = os.path.join(host_paths.DIR_SOURCE_ROOT,
                                       isolate_file_path)
   else:
     isolate_rel_path = isolate_file_paths.get(suite_name)
     if not isolate_rel_path:
       logging.info('Did not find an isolate file for the test suite.')
       return
-    isolate_abs_path = os.path.join(constants.DIR_SOURCE_ROOT, isolate_rel_path)
+    isolate_abs_path = os.path.join(host_paths.DIR_SOURCE_ROOT,
+                                    isolate_rel_path)
 
   isolated_abs_path = os.path.join(
       constants.GetOutDirectory(), '%s.isolated' % suite_name)
   assert os.path.exists(isolate_abs_path), 'Cannot find %s' % isolate_abs_path
 
   i = isolator.Isolator()
   i.Clear()
   i.Remap(isolate_abs_path, isolated_abs_path)
   # We're relying on the fact that timestamps are preserved
   # by the remap command (hardlinked). Otherwise, all the data
   # will be pushed to the device once we move to using time diff
   # instead of md5sum. Perform a sanity check here.
   i.VerifyHardlinks()
   i.PurgeExcluded(deps_exclusion_list)
   i.MoveOutputDeps()
   return i
 
 
 def PushDataDeps(device, host_dir, device_dir, test_options):
   valgrind_tools.PushFilesForTool(test_options.tool, device)
   if os.path.exists(host_dir):
     device.PushChangedFiles([(host_dir, device_dir)],
                             delete_device_stale=test_options.delete_stale_data)