Add everything from src/tools/isolate r159537.

isolate_merge.py

Index: isolate_merge.py
diff --git a/isolate_merge.py b/isolate_merge.py
new file mode 100755
index 0000000000000000000000000000000000000000..cab86d65c4a81485f285f5373b4a27967dedacb7
--- /dev/null
+++ b/isolate_merge.py
@@ -0,0 +1,68 @@
+#!/usr/bin/env python
+# Copyright (c) 2012 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.
+
+"""Merges multiple OS-specific gyp dependency lists into one that works on all
+of them.
+
+The logic is relatively simple. Takes the current conditions, add more
+condition, find the strict subset. Done.
+"""
+
+import logging
+import sys
+
+from isolate import Configs, DEFAULT_OSES, eval_content, extract_comment
+from isolate import load_isolate_as_config, union, convert_map_to_isolate_dict
+from isolate import reduce_inputs, invert_map, print_all
+import run_test_cases
+
+
+def load_isolates(items, default_oses):
+  """Parses each .isolate file and returns the merged results.
+
+  It only loads what load_isolate_as_config() can process.
+
+  Return values:
+    files: dict(filename, set(OS where this filename is a dependency))
+    dirs:  dict(dirame, set(OS where this dirname is a dependency))
+    oses:  set(all the OSes referenced)
+    """
+  configs = Configs(default_oses, None)
+  for item in items:
+    logging.debug('loading %s' % item)
+    with open(item, 'r') as f:
+      content = f.read()
+    new_config = load_isolate_as_config(
+        eval_content(content), extract_comment(content), default_oses)
+    logging.debug('has OSes: %s' % ','.join(k for k in new_config.per_os if k))
+    configs = union(configs, new_config)
+  logging.debug('Total OSes: %s' % ','.join(k for k in configs.per_os if k))
+  return configs
+
+
+def main(args=None):
+  parser = run_test_cases.OptionParserWithLogging(
+      usage='%prog <options> [file1] [file2] ...')
+  parser.add_option(
+      '-o', '--output', help='Output to file instead of stdout')
+  parser.add_option(
+      '--os', default=','.join(DEFAULT_OSES),
+      help='Inject the list of OSes, default: %default')
+
+  options, args = parser.parse_args(args)
+
+  configs = load_isolates(args, options.os.split(','))
+  data = convert_map_to_isolate_dict(
+      *reduce_inputs(*invert_map(configs.flatten())))
+  if options.output:
+    with open(options.output, 'wb') as f:
+      print_all(configs.file_comment, data, f)
+  else:
+    print_all(configs.file_comment, data, sys.stdout)
+  return 0
+
+
+if __name__ == '__main__':
+  sys.exit(main())