[iOS/GN] Add template for generate_localizable_strings tool.

ios/chrome/tools/strings/generate_localizable_strings.py

Index: ios/chrome/tools/strings/generate_localizable_strings.py
diff --git a/ios/chrome/tools/strings/generate_localizable_strings.py b/ios/chrome/tools/strings/generate_localizable_strings.py
new file mode 100644
index 0000000000000000000000000000000000000000..cd993b76cce69641adb5f27387247e34d88ca090
--- /dev/null
+++ b/ios/chrome/tools/strings/generate_localizable_strings.py
@@ -0,0 +1,25 @@
+# Copyright 2016 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 os
+import sys
+

[justincohen, 2016/05/20 15:39:01]

comment explaining what the script does. 

+
+def Main(args):
+  if len(args) < 5:
+    sys.stderr.write(
+        'usage: %s tool config include_dir datapack_dir output_dir locales ...'
+        % os.path.basename(sys.argv[0]))
+    sys.exit(1)
+
+  tool, config_file, include_dir, datapack_dir, output_dir = args[:5]
+  locales = args[5:]
+
+  os.execv(tool, [tool, '-c', config_file, '-I', include_dir, '-p',

[justincohen, 2016/05/20 15:39:00]

I guess gn can't call out to exec itself?  This is a pretty general script.  Why
not just do this in GN?

+      datapack_dir, '-o', output_dir] + locales)
+  sys.exit(1)
+
+
+if __name__ == '__main__':
+  Main(sys.argv[1:])