Fix python scripts in src/tools/

tools/site_compare/drivers/win32/mouse.py

-#!/usr/bin/python2.4
-# Copyright (c) 2006-2008 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.
 
 """SiteCompare module for simulating mouse input.
 
 This module contains functions that can be used to simulate a user
 navigating using a pointing device. This includes mouse movement,
 clicking with any button, and dragging.
 """
 
@@ skipping 169 matching lines @@
     click_time: duration of the clicks
     time_between_clicks: length of time to pause between clicks
 
   Returns:
     Nothing
   """
   ClickInWindow(hwnd, offset, button, click_time)
   time.sleep(time_between_clicks)
   ClickInWindow(hwnd, offset, button, click_time)
 
-if __name__ == "__main__":
+
+def main():
   # We're being invoked rather than imported. Let's do some tests
 
   screen_size = win32gui.GetClientRect(win32gui.GetDesktopWindow())
   screen_size = (screen_size[2], screen_size[3])
 
   # move the mouse (instantly) to the upper right corner
   MoveToLocation((screen_size[0], 0))
 
   # move the mouse (over five seconds) to the lower left corner
   MoveToLocation((0, screen_size[1]), 5)
 
   # click the left mouse button. This will open up the Start menu
   # if the taskbar is at the bottom
 
   ClickButton()
 
   # wait a bit, then click the right button to open the context menu
   time.sleep(3)
   ClickButton('right')
 
   # move the mouse away and then click the left button to dismiss the
   # context menu
   MoveToLocation((screen_size[0]/2, screen_size[1]/2), 3)
   MoveToLocation((0, 0), 3)
   ClickButton()
 
+
+if __name__ == "__main__":
+  sys.exit(main())