Add support for python pageset

tools/telemetry/telemetry/page/python_page_set.py

Index: tools/telemetry/telemetry/page/python_page_set.py
diff --git a/tools/telemetry/telemetry/page/python_page_set.py b/tools/telemetry/telemetry/page/python_page_set.py
new file mode 100644
index 0000000000000000000000000000000000000000..853d3f80fec1cbefcfb4e13308bf62f2de343c09
--- /dev/null
+++ b/tools/telemetry/telemetry/page/python_page_set.py
@@ -0,0 +1,32 @@
+# 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.
+
+class PythonPageSet(object):
+  def __init__(self, description, archive_data_file, credentials_path,
+               user_agent_type, make_javascript_deterministic):
+    self.description = description
+    self.archive_data_file = archive_data_file
+    self.credentials_path = credentials_path
+    self.user_agent_type = user_agent_type
+    self.make_javascript_deterministic = make_javascript_deterministic
+    self._pages = []
+
+  def AddPage(self, page):
+    self._pages.append(page)
+
+  def AddPages(self, pages):
+    self._pages.extend(pages)
+
+  @classmethod
+  def FromFile(cls, file_path):
+    assert file_path.endswith('.py'), 'This pageset only supports python file'
+    #TODO(nednguyen): implement this method
+
+  @property
+  def pages(self):
+    return self._pages
+
+  @property
+  def is_python_pageset(self):
+    return True