[iOS] Fix ios_web_shell to build with gn.

build/config/ios/ios_compile_xib.py

Index: build/config/ios/ios_compile_xib.py
diff --git a/build/config/ios/ios_compile_xib.py b/build/config/ios/ios_compile_xib.py
new file mode 100644
index 0000000000000000000000000000000000000000..ebca3abdcae6b420e4a26434614539e87cfb1a36
--- /dev/null
+++ b/build/config/ios/ios_compile_xib.py
@@ -0,0 +1,34 @@
+# 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 argparse
+import os
+import subprocess
+import sys
+
+
+def main():
+  parser = argparse.ArgumentParser(
+      description='A script to compile xib and storyboard.',
+      fromfile_prefix_chars='@')
+  parser.add_argument('-o', '--output', required=True,
+                      help='Path to output bundle.')
+  parser.add_argument('-i', '--input', required=True,
+                      help='Path to input xib or storyboard.')
+  parser.add_argument('-m', '--minimum-deployment-target', required=True,
+                      help='Minimum deployment target.')
+  args = parser.parse_args()
+
+  subprocess.check_call([
+      'xcrun', 'ibtool', '--errors', '--warnings', '--notices',
+      '--auto-activate-custom-fonts', '--target-device', 'iphone',
+      '--target-device', 'ipad', '--output-format', 'human-readable-text',
+      '--minimum-deployment-target', args.minimum_deployment_target,
+      '--compile', os.path.abspath(args.output), os.path.abspath(args.input),
+  ])
+
+
+if __name__ == '__main__':
+  sys.exit(main())