More changes to support hermetic Xcode toolchain in GN.

third_party/WebKit/Source/build/scripts/in_generator.py

 # Copyright (C) 2013 Google Inc. All rights reserved.
 #
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 # modification, are permitted provided that the following conditions are
 # met:
 #
 #     * Redistributions of source code must retain the above copyright
 # notice, this list of conditions and the following disclaimer.
 #     * Redistributions in binary form must reproduce the above
 # copyright notice, this list of conditions and the following disclaimer
 # in the documentation and/or other materials provided with the
 # distribution.
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 # contributors may be used to endorse or promote products derived from
 # this software without specific prior written permission.
 #
 # THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
 # "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
 # LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
 # A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
 # OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
 # SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
 # LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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+import os
 import os.path
 import shlex
 import shutil
 import optparse
 
 from in_file import InFile
 
 
 class Writer(object):
     # Subclasses should override.
@@ skipping 40 matching lines @@
         self._writer_class = writer_class
 
     def main(self, argv):
         script_name = os.path.basename(argv[0])
         args = argv[1:]
         if len(args) < 1:
             print "USAGE: %s INPUT_FILES" % script_name
             exit(1)
 
         parser = optparse.OptionParser()
+
         parser.add_option("--gperf", default="gperf")
+        parser.add_option("--developer_dir",
+                          help='Path to Xcode.')
         parser.add_option("--output_dir", default=os.getcwd())
         options, args = parser.parse_args()
 
+        if options.developer_dir:
+            os.environ['DEVELOPER_DIR'] = options.developer_dir
+
         writer = self._writer_class(args)
         writer.set_gperf_path(options.gperf)
         writer.write_files(options.output_dir)