Update tools/build.py --mode=all to include product.

tools/build.py

 #!/usr/bin/env python
 #
 # Copyright (c) 2012, the Dart project authors.  Please see the AUTHORS file
 # for details. All rights reserved. Use of this source code is governed by a
 # BSD-style license that can be found in the LICENSE file.
 #
 
 import optparse
 import os
 import re
@@ skipping 72 matching lines @@
 def ProcessOsOption(os_name):
   if os_name == 'host':
     return HOST_OS
   return os_name
 
 
 def ProcessOptions(options, args):
   if options.arch == 'all':
     options.arch = 'ia32,x64,simarm,simmips,simarm64'
   if options.mode == 'all':
-    options.mode = 'release,debug'
+    options.mode = 'debug,release,product'
   if options.os == 'all':
     options.os = 'host,android'
   options.mode = options.mode.split(',')
   options.arch = options.arch.split(',')
   options.os = options.os.split(',')
   for mode in options.mode:
     if not mode in ['debug', 'release', 'product']:
       print "Unknown mode %s" % mode
       return False
   for arch in options.arch:
@@ skipping 448 matching lines @@
           else:
             if BuildOneConfig(options, target, target_os,
                               mode, arch, cross_build) != 0:
               return 1
 
   return 0
 
 
 if __name__ == '__main__':
   sys.exit(Main())