Check in the thirdparty libs needed for webkitpy.

Tools/Scripts/webkitpy/thirdparty/webpagereplay/daemonserver.py

+#!/usr/bin/env python
+# Copyright 2010 Google Inc. All Rights Reserved.
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+#      http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+
+import threading
+
+
+class DaemonServer(object):
+  """Base class which manages creation and cleanup of daemon style servers."""
+
+  def __enter__(self):
+    # TODO: Because of python's Global Interpreter Lock (GIL), the threads
+    # will run on the same CPU. Consider using processes instead because
+    # the components do not need to communicate with each other. On Linux,
+    # "taskset" could be used to assign each process to specific CPU/core.
+    # Of course, only bother with this if the processing speed is an issue.
+    # Some related discussion: http://stackoverflow.com/questions/990102/python-global-interpreter-lock-gil-workaround-on-multi-core-systems-using-tasks
+    thread = threading.Thread(target=self.serve_forever)
+    thread.daemon = True  # Python exits when no non-daemon threads are left.
+    thread.start()
+    return self
+
+  def __exit__(self, unused_exc_type, unused_exc_val, unused_exc_tb):
+    self.cleanup()