Add touch-only detection for strace API implementation.

tools/isolate/trace_inputs_smoke_test.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 json
 import logging
 import os
 import shutil
 import subprocess
@@ skipping 556 matching lines @@
       'root': {
         'children': [],
         'command': [
           self.executable,
           os.path.join('trace_inputs', 'touch_only.py'),
           command,
         ],
         'executable': self.real_executable,
         'files': [
           {
+            'path': os.path.join(u'data', 'trace_inputs', 'test_file.txt'),
+            'size': 0,
+          },
+          {
             'path': os.path.join(u'data', 'trace_inputs', 'touch_only.py'),
             'size': self._size('data', 'trace_inputs', 'touch_only.py'),
           },
         ],
         'initial_cwd': self.initial_cwd,
       },
     }
+    if sys.platform != 'linux2':
+      # TODO(maruel): Remove once properly implemented.
+      expected['root']['files'].pop(0)
+
     actual = results.flatten()
     self.assertTrue(actual['root'].pop('pid'))
     self.assertEquals(expected, actual)
 
   def test_trace_touch_only_access(self):
     self._touch_expected('access')
 
   def test_trace_touch_only_isfile(self):
     self._touch_expected('isfile')
 
   def test_trace_touch_only_stat(self):
     self._touch_expected('stat')
 
 
 if __name__ == '__main__':
   VERBOSE = '-v' in sys.argv
   logging.basicConfig(level=logging.DEBUG if VERBOSE else logging.ERROR)
   unittest.main()