Make resource repacker work on Windows

tools/resources/find_used_resources.py

 #!/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 re
 import sys
 
 usage = """find_used_resources.py
 
 Prints out (to sdout) the sorted list of resource ids that are part of unknown
 pragma warning in the given build log (via stdin).
 
 This script is used to find the resources that are actually compiled in Chrome
 in order to only include the needed strings/images in Chrome PAK files. The
 script parses out the list of used resource ids. These resource ids show up in
 the build output after building Chrome with gyp variable
 enable_resource_whitelist_generation set to 1. This gyp flag causes the compiler
 to print out a UnknownPragma message every time a resource id is used. E.g.:
 foo.cc:22:0: warning: ignoring #pragma whitelisted_resource_12345
 [-Wunknown-pragmas]
 
+On Windows, the message is simply a message via __pragma(message(...)).

[Nico, 2014/04/14 23:42:00]

Hm, I wonder if we could do the same on non-win:

          #define DO_PRAGMA(x) _Pragma (#x)
          #define FOO(x) DO_PRAGMA(message ("TODO - " #x))
          

(from http://gcc.gnu.org/onlinedocs/gcc/Diagnostic-Pragmas.html)

[scottmg, 2014/04/14 23:45:20]

From the chromium-dev thread titled "generated_resources.grd" I got the
impression it didn't work for some reason? Maybe it does on a newer GCC or
something, Aurimas?

[aurimas (slooooooooow), 2014/04/14 23:53:05]

pragma message is not supported on gcc used to build Chrome for Android :(

+
 """
 
 
 def GetResourceIdsInPragmaWarnings(input):
   """Returns sorted set of resource ids that are inside unknown pragma warnings
      for the given input.
   """
   used_resources = set()
-  unknown_pragma_warning_pattern = re.compile('warning: ignoring #pragma '
-      'whitelisted_resource_(?P<resource_id>[0-9]*)  \[-Wunknown-pragmas\]')
+  unknown_pragma_warning_pattern = re.compile(
+      'whitelisted_resource_(?P<resource_id>[0-9]*)')
   for ln in input:
     match = unknown_pragma_warning_pattern.search(ln)
     if match:
       resource_id = match.group('resource_id')
       used_resources.add(resource_id)
   return sorted(used_resources)
 
 def Main():
   if len(sys.argv) != 1:
     sys.stderr.write(usage)
     sys.exit(1)
   else:
     used_resources = GetResourceIdsInPragmaWarnings(sys.stdin)
     for rid in used_resources:
       sys.stdout.write(rid + '\n')
 
 if __name__ == '__main__':
   Main()