Rationalize Dart mojo and sky package structure

mojo/public/tools/dart_package_name.py

+#!/usr/bin/python
+# Copyright 2015 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.
+
+"""This script outputs the package name specified in the pubspec.yaml"""
+
+import argparse
+import os
+import sys
+
+def PackageName(line):
+  assert line.startswith("name:")
+  return line.split(":")[1].strip()
+
+def main(pubspec_file):
+  source_file = open(pubspec_file, "r")
+  for line in source_file:
+    if line.startswith("name:"):
+      print(PackageName(line))
+      return 0
+  source_file.close()
+  # Couldn't find it.
+  return -1
+
+if __name__ == '__main__':
+  parser = argparse.ArgumentParser(
+      description="This script outputs the package name specified in the"
+                  "pubspec.yaml")
+  parser.add_argument("--pubspec",
+                      dest="pubspec_file",
+                      metavar="<pubspec-file>",
+                      type=str,
+                      required=True,
+                      help="Path to pubspec file")
+  args = parser.parse_args()
+  sys.exit(main(args.pubspec_file))