Introduce UserStory & UserStorySet classes.

tools/telemetry/telemetry/user_story/__init__.py

Index: tools/telemetry/telemetry/user_story/__init__.py
diff --git a/tools/telemetry/telemetry/user_story/__init__.py b/tools/telemetry/telemetry/user_story/__init__.py
new file mode 100644
index 0000000000000000000000000000000000000000..1b23d51f1baec7c9b8e5ed15b331c96295302f3a
--- /dev/null
+++ b/tools/telemetry/telemetry/user_story/__init__.py
@@ -0,0 +1,45 @@
+# Copyright 2014 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.
+
+import re
+
+_next_user_story_id = 0
+
+
+class UserStory(object):
+  def __init__(self, name=''):
+    self._name = name
+    global _next_user_story_id
+    self._id = _next_user_story_id
+    _next_user_story_id += 1
+
+  @property
+  def id(self):
+    return self._id
+
+  @property
+  def name(self):
+    return self._name
+
+  def AsDict(self):
+    """Converts a user story object to a dict suitable for JSON output."""
+    d = {
+      'id': self._id,
+    }
+    if self._name:
+      d['name'] = self._name
+    return d
+
+  @property
+  def file_safe_name(self):
+    """A version of display_name that's safe to use as a filename."""
+    # Just replace all special characters in the url with underscore.
+    return re.sub('[^a-zA-Z0-9]', '_', self.display_name)
+
+  @property
+  def display_name(self):
+    if self.name:
+      return self.name
+    else:
+      return self.__class__.__name__