Convert relative paths to absolute paths in iOS test runner

ios/build/bots/scripts/test_runner.py

 # Copyright 2016 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.
 
 """Test runners for iOS."""
 
 import argparse
 import collections
 import errno
 import os
@@ skipping 136 matching lines @@
       test_args: List of strings to pass as arguments to the test when
         launching.
       xctest: Whether or not this is an XCTest.
 
     Raises:
       AppNotFoundError: If the given app does not exist.
       PlugInsNotFoundError: If the PlugIns directory does not exist for XCTests.
       XcodeVersionNotFoundError: If the given Xcode version does not exist.
       XCTestPlugInNotFoundError: If the .xctest PlugIn does not exist.
     """
+    app_path = os.path.abspath(app_path)
     if not os.path.exists(app_path):
       raise AppNotFoundError(app_path)
 
     if not find_xcode.find_xcode(xcode_version)['found']:
       raise XcodeVersionNotFoundError(xcode_version)
 
     if not os.path.exists(out_dir):
       os.makedirs(out_dir)
 
     self.app_name = os.path.splitext(os.path.split(app_path)[-1])[0]
@@ skipping 201 matching lines @@
     """
     super(SimulatorTestRunner, self).__init__(
         app_path,
         xcode_version,
         out_dir,
         env_vars=env_vars,
         test_args=test_args,
         xctest=xctest,
     )
 
+    iossim_path = os.path.abspath(iossim_path)
     if not os.path.exists(iossim_path):
       raise SimulatorNotFoundError(iossim_path)
 
     self.homedir = ''
     self.iossim_path = iossim_path
     self.platform = platform
     self.start_time = None
     self.version = version
 
   @staticmethod
@@ skipping 258 matching lines @@
       A dict of environment variables.
     """
     env = super(DeviceTestRunner, self).get_launch_env()
     if self.xctest_path:
       # e.g. ios_web_shell_test_host
       env['APP_TARGET_NAME'] = (
         os.path.splitext(os.path.basename(self.app_path))[0])
       # e.g. ios_web_shell_test
       env['TEST_TARGET_NAME'] = env['APP_TARGET_NAME'].rsplit('_', 1)[0]
     return env