Fix python scripts in src/tools/

tools/traceline/traceline/scripts/split.py

-# Copyright (c) 2009 The Chromium Authors. All rights reserved.
+#!/usr/bin/env python
+# Copyright (c) 2011 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.
 
-# Splits a single json file (read from stdin) into separate files of 40k
-# records, named split.X.
+"""Splits a single json file (read from stdin) into separate files of 40k
+records, named split.X.
+"""
 
 import sys
 
-filecount = 0;
-count = 0;
 
-f = open('split.0', 'wb');
+def main():
+  filecount = 0
+  count = 0
+  f = open('split.0', 'wb')
+  for l in sys.stdin:
+    if l == "},\r\n":
+      count += 1
+      if count == 40000:
+        f.write("}]);\r\n")
+        count = 0
+        filecount += 1
+        f = open('split.%d' % filecount, 'wb')
+        f.write("parseEvents([\r\n")
+        continue
+    f.write(l)
 
-for l in sys.stdin:
-  if l == "},\r\n":
-    count += 1
-    if count == 40000:
-      f.write("}]);\r\n")
-      count = 0;
-      filecount += 1
-      f = open('split.%d' % filecount, 'wb');
-      f.write("parseEvents([\r\n")
-      continue
-  f.write(l)
+
+if __name__ == '__main__':
+  main()