Add variables support to trace_test_cases.py, removing the last use of --product-dir.

tools/isolate/isolate_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 cStringIO
 import hashlib
 import json
 import logging
 import os
@@ skipping 538 matching lines @@
     self.assertEquals(expected, out)
 
   def test_touch_root(self):
     out = self._execute('trace', 'touch_root.isolate', [], True)
     self.assertEquals('', out)
     self._expect_no_tree()
     self._expect_results(['touch_root.py'], None, None)
     expected = self._wrap_in_condition(
         {
           isolate.isolate_common.KEY_TRACKED: [
+            '../../isolate.py',
             'touch_root.py',
-            '../../isolate.py',
           ],
         })
     out = self._execute('read', 'touch_root.isolate', [], True)
     self.assertEquals(expected, out)
 
   def test_with_flag(self):
     out = self._execute(
         'trace', 'with_flag.isolate', ['-V', 'FLAG', 'trace'], True)
     self.assertEquals('', out)
     self._expect_no_tree()
@@ skipping 125 matching lines @@
     ]
     self.assertEquals(files, list_files_tree(self.tempdir))
 
   def test_read_trace(self):
     self._execute('trace', [self.filename()], False)
     # Read the trace before cleaning up. No need to specify self.filename()
     # because add the needed information is in the .state file.
     output = self._execute('read', [], True)
     expected = {
       isolate.isolate_common.KEY_TRACKED: [
+        '../../isolate.py',
         'touch_root.py',
-        '../../isolate.py',
       ],
     }
     self.assertEquals(self._wrap_in_condition(expected), output)
 
     # Clean the directory from the logs, which are OS-specific.
     isolate.trace_inputs.get_api().clean_trace(
         os.path.join(self.tempdir, 'isolate_smoke_test.results.log'))
     files = [
       'isolate_smoke_test.results',
       'isolate_smoke_test.state',
       os.path.join('root', 'data', 'isolate', 'touch_root.isolate'),
       os.path.join('root', 'data', 'isolate', 'touch_root.py'),
       os.path.join('root', 'isolate.py'),
     ]
     self.assertEquals(files, list_files_tree(self.tempdir))
 
 
 if __name__ == '__main__':
   VERBOSE = '-v' in sys.argv
   logging.basicConfig(level=logging.DEBUG if VERBOSE else logging.ERROR)
   unittest.main()