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

build/android/pylib/perf/test_runner.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.
 
 """Runs perf tests.
 
 Our buildbot infrastructure requires each slave to run steps serially.
 This is sub-optimal for android, where these steps can run independently on
 multiple connected devices.
 
@@ skipping 50 matching lines @@
 import zipfile
 
 from devil.android import battery_utils
 from devil.android import device_errors
 from devil.android import forwarder
 from devil.constants import exit_codes
 from devil.utils import cmd_helper
 from pylib import constants
 from pylib.base import base_test_result
 from pylib.base import base_test_runner
+from pylib.constants import host_paths
 
 
 # Regex for the master branch commit position.
 _GIT_CR_POS_RE = re.compile(r'^Cr-Commit-Position: refs/heads/master@{#(\d+)}$')
 
 
 def _GetChromiumRevision():
   # pylint: disable=line-too-long
   """Get the git hash and commit position of the chromium master branch.
 
   See: https://chromium.googlesource.com/chromium/tools/build/+/master/scripts/slave/runtest.py#212
 
   Returns:
     A dictionary with 'revision' and 'commit_pos' keys.
   """
   # pylint: enable=line-too-long
   status, output = cmd_helper.GetCmdStatusAndOutput(
       ['git', 'log', '-n', '1', '--pretty=format:%H%n%B', 'HEAD'],
-      constants.DIR_SOURCE_ROOT)
+      host_paths.DIR_SOURCE_ROOT)
   revision = None
   commit_pos = None
   if not status:
     lines = output.splitlines()
     revision = lines[0]
     for line in reversed(lines):
       m = _GIT_CR_POS_RE.match(line.strip())
       if m:
         commit_pos = int(m.group(1))
         break
@@ skipping 265 matching lines @@
     full_cmd = cmd
     if self._options.dry_run:
       full_cmd = 'echo %s' % cmd
 
     logfile = sys.stdout
     archive_bytes = None
     if self._options.single_step:
       # Just print a heart-beat so that the outer buildbot scripts won't timeout
       # without response.
       logfile = _HeartBeatLogger()
-    cwd = os.path.abspath(constants.DIR_SOURCE_ROOT)
+    cwd = os.path.abspath(host_paths.DIR_SOURCE_ROOT)
     if full_cmd.startswith('src/'):
-      cwd = os.path.abspath(os.path.join(constants.DIR_SOURCE_ROOT, os.pardir))
+      cwd = os.path.abspath(os.path.join(host_paths.DIR_SOURCE_ROOT, os.pardir))
     try:
       exit_code, output = cmd_helper.GetCmdStatusAndOutputWithTimeout(
           full_cmd, timeout, cwd=cwd, shell=True, logfile=logfile)
       json_output = self._ReadChartjsonOutput()
       if test_config.get('archive_output_dir'):
         archive_bytes = self._ArchiveOutputDir()
     except cmd_helper.TimeoutError as e:
       exit_code = -1
       output = e.output
       json_output = ''
@@ skipping 70 matching lines @@
     Returns:
       A tuple of (TestRunResults, retry).
     """
     _, result_type = self._LaunchPerfTest(test_name)
     results = base_test_result.TestRunResults()
     results.AddResult(base_test_result.BaseTestResult(test_name, result_type))
     retry = None
     if not results.DidRunPass():
       retry = test_name
     return results, retry