[Mac/GN] Setup Keystone for official Chrome builds.

chrome/tools/build/mac/copy_keystone_framework.py

Index: chrome/tools/build/mac/copy_keystone_framework.py
diff --git a/chrome/tools/build/mac/copy_keystone_framework.py b/chrome/tools/build/mac/copy_keystone_framework.py
new file mode 100644
index 0000000000000000000000000000000000000000..b43893bf8aa7847375a04c421d849f2dde69a4d3
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+++ b/chrome/tools/build/mac/copy_keystone_framework.py
@@ -0,0 +1,43 @@
+# 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.path
+import shutil
+import subprocess
+import sys
+
+# Usage: python copy_keystone_framework.py /path/to/input /path/to/output
+#
+# This script copies the KeystoneRegistration.framework, removing its
+# versioned directory structure, thinning it to just x86_64, and deleting
+# the Headers directory.
+
+def Main(args):
+  if len(args) != 3:
+    print >> sys.stderr, '%s: /path/to/input /path/to/output' % (args[0],)
+    return 1
+
+  # Delete any old copies of the framework.
+  output_path = os.path.join(args[2], 'KeystoneRegistration.framework')
+  if os.path.exists(output_path):
+    shutil.rmtree(output_path)
+
+  # Copy the framework out of its versioned directory. Use rsync to exclude
+  # dotfiles and the Headers directories.
+  subprocess.check_call(
+      ['rsync', '-acC', '--delete',
+       '--exclude', 'Headers', '--exclude', 'PrivateHeaders',
+       '--include', '*.so',
+       os.path.join(args[1], 'Versions/Current/'),
+       output_path])
+
+  # Thin the library to just the required arch.
+  library_path = os.path.join(output_path, 'KeystoneRegistration')
+  subprocess.check_call(
+      ['lipo', '-thin', 'x86_64', library_path, '-o', library_path])
+  return 0
+
+
+if __name__ == '__main__':
+  sys.exit(Main(sys.argv))