[Mac/GN] Add targets to run dump_syms and create the dSYM archive.

chrome/tools/build/mac/archive_symbols.py

+# 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 subprocess
+import sys
+
+# This script creates a BZ2-compressed TAR file for archiving Chrome symbols.
+
+def Main(args):
+  if len(args) < 2:
+    print >> sys.stderr, "Usage: python archive_symbols.py file.tar.bz2 file..."
+    return 1
+
+  _RemoveIfExists(args[0])
+
+  try:
+    return subprocess.check_call(['tar', '-cjf'] + args)
+  except:
+    _RemoveIfExists(args[0])
+    raise
+
+
+def _RemoveIfExists(path):
+  if os.path.exists(path):
+    os.unlink(path)
+
+
+if __name__ == '__main__':
+  sys.exit(Main(sys.argv[1:]))