Make absolute and sort all Sky headers

tools/sort-headers.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.
 
 """Given a filename as an argument, sort the #include/#imports in that file.
 
 Shows a diff and prompts for confirmation before doing the deed.
 Works great with tools/git/for-all-touched-files.py.
 """
@@ skipping 28 matching lines @@
 
 def IncludeCompareKey(line):
   """Sorting comparator key used for comparing two #include lines.
   Returns the filename without the #include/#import/import prefix.
   """
   for prefix in ('#include ', '#import ', 'import '):
     if line.startswith(prefix):
       line = line[len(prefix):]
       break
 
+  # In sky, config.h must always be first to defined HAVE, USE, etc.
+  if line.startswith('"sky/engine/config.h"'):
+    return '0'
+
   # The win32 api has all sorts of implicit include order dependencies :-/
   # Give a few headers special sort keys that make sure they appear before all
   # other headers.
   if line.startswith('<windows.h>'):  # Must be before e.g. shellapi.h
     return '0'
   if line.startswith('<atlbase.h>'):  # Must be before atlapp.h.
     return '1' + line
   if line.startswith('<ole2.h>'):  # Must be before e.g. intshcut.h
     return '1' + line
   if line.startswith('<unknwn.h>'):  # Must be before e.g. intshcut.h
@@ skipping 120 matching lines @@
   if len(filenames) < 1:
     parser.print_help()
     return 1
 
   for filename in filenames:
     DiffAndConfirm(filename, opts.should_confirm, opts.perform_safety_checks)
 
 
 if __name__ == '__main__':
   sys.exit(main())