Reland "Merge more Kernel infrastructure from kernel_sdk SDK fork."

runtime/tools/concatenate_patches.py

+#!/usr/bin/env python
+# Copyright (c) 2016, the Dart project authors.  Please see the AUTHORS file
+# for details. All rights reserved. Use of this source code is governed by a
+# BSD-style license that can be found in the LICENSE file.
+
+from optparse import OptionParser
+
+def writePatch(output_file_name, input_file_names):
+  dart_file_names = filter(lambda name: name.endswith('.dart'),
+                           input_file_names)
+  with open(output_file_name, 'w') as output_file:
+    for dart_file_name in dart_file_names:
+      with open(dart_file_name, 'r') as dart_file:
+        output_file.write(dart_file.read())
+
+
+def main():
+  parser = OptionParser()
+  parser.add_option('--output', action='store', type='string',
+                    help='output file path')
+  (options, args) = parser.parse_args()
+  if not options.output:
+    parser.error('missing --output option\n')
+  if len(args) == 0:
+    parser.error('no input files given\n')
+  writePatch(options.output, args)
+
+
+if __name__ == '__main__':
+  main()