[Android] memory_inspector: bug / UI fixes.

tools/memory_inspector/run_tests

 #!/usr/bin/env python
 # Copyright 2014 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 logging
 import memory_inspector
 import sys
 import unittest
 
 
 if __name__ == '__main__':
   logging.basicConfig(
       level=logging.DEBUG if '-v' in sys.argv else logging.WARNING,
       format='%(levelname)5s %(filename)15s(%(lineno)3d): %(message)s')
 
   suite = unittest.TestSuite()
   loader = unittest.TestLoader()
+  pattern = '*%s*_unittest.py' % ('' if len(sys.argv) < 2 else sys.argv[1])
   suite.addTests(loader.discover(start_dir=memory_inspector.ROOT_DIR,
-                                 pattern='*_unittest.py'))
+                                 pattern=pattern))
   res = unittest.TextTestRunner(verbosity=2).run(suite)
   if res.wasSuccessful():
     sys.exit(0)
   else:
     sys.exit(1)