Move base_dir to user_story_set, remove file_path.

tools/telemetry/telemetry/user_story/user_story_set.py

Index: tools/telemetry/telemetry/user_story/user_story_set.py
diff --git a/tools/telemetry/telemetry/user_story/user_story_set.py b/tools/telemetry/telemetry/user_story/user_story_set.py
index aabd76e325869451acd2aee8ed3d6f2361a6c440..df500df45235b8649941c64eda6caae23725a1dd 100644
--- a/tools/telemetry/telemetry/user_story/user_story_set.py
+++ b/tools/telemetry/telemetry/user_story/user_story_set.py
@@ -17,7 +17,7 @@ class UserStorySet(object):
   """
 
   def __init__(self, archive_data_file='', cloud_storage_bucket=None,
-               serving_dirs=None):
+               base_dir=None, serving_dirs=None):
     """Creates a new UserStorySet.
 
     Args:
@@ -33,11 +33,21 @@ class UserStorySet(object):
     self._wpr_archive_info = None
     archive_info.AssertValidCloudStorageBucket(cloud_storage_bucket)
     self._cloud_storage_bucket = cloud_storage_bucket
-    self._base_dir = os.path.dirname(inspect.getfile(self.__class__))
+    if base_dir:
+      if not os.path.isdir(base_dir):
+        raise ValueError('Must provide valid directory path for base_dir.')
+      self._base_dir = base_dir
+    else:
+      self._base_dir = os.path.dirname(inspect.getfile(self.__class__))
     # Convert any relative serving_dirs to absolute paths.
     self._serving_dirs = set(os.path.realpath(os.path.join(self.base_dir, d))
                              for d in serving_dirs or [])
 
+
+  @property
+  def file_path(self):
+    return inspect.getfile(self.__class__).replace('.pyc', '.py')
+
   @property
   def base_dir(self):
     """The base directory to resolve archive_data_file.