[Mac/iOS/GN] Re-purpose the ios_compile_xib.py file to also handle Mac XIBs.

build/config/mac/compile_xib.py

Index: build/config/mac/compile_xib.py
diff --git a/build/config/mac/compile_xib.py b/build/config/mac/compile_xib.py
new file mode 100644
index 0000000000000000000000000000000000000000..845f8c179550bbd339cbd306a008671cf8573607
--- /dev/null
+++ b/build/config/mac/compile_xib.py
@@ -0,0 +1,51 @@
+# 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 re
+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.')
+  args, unknown_args = parser.parse_known_args()
+
+  ibtool_args = [
+      'xcrun', 'ibtool',
+      '--errors', '--warnings', '--notices',
+      '--output-format', 'human-readable-text'
+  ]
+  ibtool_args += unknown_args
+  ibtool_args += [
+      '--compile',
+      os.path.abspath(args.output),
+      os.path.abspath(args.input)
+  ]
+
+  ibtool_section_re = re.compile(r'/\*.*\*/')
+  ibtool_re = re.compile(r'.*note:.*is clipping its content')
+  ibtoolout = subprocess.Popen(ibtool_args, stdout=subprocess.PIPE)
+  current_section_header = None
+  for line in ibtoolout.stdout:
+    if ibtool_section_re.match(line):
+      current_section_header = line
+    elif not ibtool_re.match(line):
+      if current_section_header:
+        sys.stdout.write(current_section_header)
+        current_section_header = None
+      sys.stdout.write(line)
+  return ibtoolout.returncode
+
+
+if __name__ == '__main__':
+  sys.exit(main())