[test_runner] support relative paths on argument --shared-prefs-file

build/android/test_runner.py

 #!/usr/bin/env python
 #
 # 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 all types of tests from one unified interface."""
 
 import argparse
 import collections
@@ skipping 32 matching lines @@
 from pylib.utils import logdog_helper
 from pylib.utils import logging_utils
 
 from py_utils import contextlib_ext
 
 
 _DEVIL_STATIC_CONFIG_FILE = os.path.abspath(os.path.join(
     host_paths.DIR_SOURCE_ROOT, 'build', 'android', 'devil_config.json'))
 
 
+def _RealPath(arg):
+  if arg.startswith('//'):
+    arg = os.path.abspath(os.path.join(host_paths.DIR_SOURCE_ROOT,
+                                       arg[2:].replace('/', os.sep)))
+  return os.path.realpath(arg)
+
+
 def AddTestLauncherOptions(parser):
   """Adds arguments mirroring //base/test/launcher.
 
   Args:
     parser: The parser to which arguments should be added.
   Returns:
     The given parser.
   """
   parser.add_argument(
       '--test-launcher-retry-limit',
@@ skipping 350 matching lines @@
   parser.add_argument(
       '--runtime-deps-path',
       dest='runtime_deps_path', type=os.path.realpath,
       help='Runtime data dependency file from GN.')
   parser.add_argument(
       '--screenshot-directory',
       dest='screenshot_dir', type=os.path.realpath,
       help='Capture screenshots of test failures')
   parser.add_argument(
       '--shared-prefs-file',
-      dest='shared_prefs_file', type=os.path.realpath,
+      dest='shared_prefs_file', type=_RealPath,
       help='The relative path to a file containing JSON list of shared '
            'preference files to edit and how to do so. Example list: '
            '[{'
            '  "package": "com.package.example",'
            '  "filename": "ExampleSettings.xml",'
            '  "set": {'
            '    "boolean_key_in_xml": true,'
            '    "string_key_in_xml": "string_value"'
            '  },'
            '  "remove": ['
@@ skipping 540 matching lines @@
     if e.is_infra_error:
       return constants.INFRA_EXIT_CODE
     return constants.ERROR_EXIT_CODE
   except: # pylint: disable=W0702
     logging.exception('Unrecognized error occurred.')
     return constants.ERROR_EXIT_CODE
 
 
 if __name__ == '__main__':
   sys.exit(main())