Fix python scripts in src/tools/

tools/traceline/traceline/scripts/scstats.py

Index: tools/traceline/traceline/scripts/scstats.py
diff --git a/tools/traceline/traceline/scripts/scstats.py b/tools/traceline/traceline/scripts/scstats.py
index 21f28d846a8843fc23f9a829bdb6e8ee34a441a9..99e72874d716cc87e1934d650fa8d3166557fbba 100755
--- a/tools/traceline/traceline/scripts/scstats.py
+++ b/tools/traceline/traceline/scripts/scstats.py
@@ -1,12 +1,12 @@
+#!/usr/bin/env python
 # Copyright (c) 2009 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 sys
 
-execfile(os.path.join(
-  os.path.dirname(os.path.join(os.path.curdir, __file__)),
-  'syscalls.py'))
+from syscalls import syscalls
+
 
 def parseEvents(z):
   calls = { }
@@ -23,4 +23,10 @@ def parseEvents(z):
   #for syscall, delta in calls.items():
   #  print '%f - %d %s' % (delta, syscall, syscalls.get(syscall, 'unknown'))
 
-execfile(sys.argv[1])
+
+def main():
+  execfile(sys.argv[1])
+
+
+if __name__ == '__main__':
+  main()