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

build/android/pylib/host_driven/test_server.py

 # Copyright 2013 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.
 
 """Host driven test server controller.
 
 This class controls the startup and shutdown of a python driven test server that
 runs in a separate process.
 
 The server starts up automatically when the object is created.
 
 After it starts up, it is possible to retreive the hostname it started on
 through accessing the member field |host| and the port name through |port|.
 
 For shutting down the server, call TearDown().
 """
 
 import logging
 import subprocess
 import os
 import os.path
 import time
 import urllib2
 
 from pylib import constants
+from pylib.constants import host_paths
 
 # NOTE: when adding or modifying these lines, omit any leading slashes!
 # Otherwise os.path.join() will (correctly) treat them as absolute paths
 # instead of relative paths, and will do nothing.
 _PYTHONPATH_DIRS = [
     'net/tools/testserver/',
     'third_party/',
     'third_party/pyftpdlib/src/',
     'third_party/pywebsocket/src',
     'third_party/tlslite/',
@@ skipping 44 matching lines @@
       shard_index: Index of the current shard.
       test_server_port: Port to run the test server on. This is multiplexed with
                         the shard index. To retrieve the real port access the
                         member variable |port|.
       test_server_path: The path (relative to the root src dir) of the server
       test_server_flags: Optional list of additional flags to the test server
     """
     self.host = _TEST_SERVER_HOST
     self.port = test_server_port + shard_index
 
-    src_dir = constants.DIR_SOURCE_ROOT
+    src_dir = host_paths.DIR_SOURCE_ROOT
     # Make dirs into a list of absolute paths.
     abs_dirs = [os.path.join(src_dir, d) for d in _PYTHONPATH_DIRS]
     # Add the generated python files to the path
     abs_dirs.extend([os.path.join(src_dir, constants.GetOutDirectory(), d)
                      for d in _GENERATED_PYTHONPATH_DIRS])
     current_python_path = os.environ.get('PYTHONPATH')
     extra_python_path = ':'.join(abs_dirs)
     if current_python_path:
       python_path = current_python_path + ':' + extra_python_path
     else:
@@ skipping 20 matching lines @@
         if d.startswith(expected_response):
           break
       except Exception as e: # pylint: disable=broad-except
         logging.info('URL %s GOT: %s', test_url, e)
       time.sleep(retries * 0.1)
       retries += 1
 
   def TearDown(self):
     self._test_server_process.kill()
     self._test_server_process.wait()