Add everything from src/tools/isolate r159537.

tests/trace_inputs/child1.py

+#!/usr/bin/env python
+# Copyright (c) 2012 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.
+
+import os
+import subprocess
+import sys
+
+
+def child():
+  """When the gyp argument is not specified, the command is started from
+  --root-dir directory.
+  """
+  print 'child from %s' % os.getcwd()
+  # Force file opening with a non-normalized path.
+  open(os.path.join('tests', '..', 'trace_inputs.py'), 'rb').close()
+  open(os.path.join(
+      'tests', '..', 'tests', 'trace_inputs_smoke_test.py'), 'rb').close()
+  # Do not wait for the child to exit.
+  # Use relative directory.
+  subprocess.Popen(
+      ['python', 'child2.py'], cwd=os.path.join('tests', 'trace_inputs'))
+  return 0
+
+
+def child_gyp():
+  """When the gyp argument is specified, the command is started from --cwd
+  directory.
+  """
+  print 'child_gyp from %s' % os.getcwd()
+  # Force file opening.
+  open(os.path.join('..', 'trace_inputs.py'), 'rb').close()
+  open(os.path.join('..', 'tests', 'trace_inputs_smoke_test.py'), 'rb').close()
+  # Do not wait for the child to exit.
+  # Use relative directory.
+  subprocess.Popen(['python', 'child2.py'], cwd='trace_inputs')
+  return 0
+
+
+def main():
+  if sys.argv[1] == '--child':
+    return child()
+  if sys.argv[1] == '--child-gyp':
+    return child_gyp()
+  return 1
+
+
+if __name__ == '__main__':
+  sys.exit(main())