Docserver: Make MockFileSystem not iterate over the entire file system as part

chrome/common/extensions/docs/server2/samples_data_source.py

 # 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.
 
 import json
 import logging
 import posixpath
 import re
 import traceback
 
@@ skipping 193 matching lines @@
     '''Fetches and filters the list of samples specified by |key|, returning
     only the samples that use the API |api_name|. |key| is either 'apps' or
     'extensions'.
     '''
     return [sample for sample in self.get(key) if any(
         call['name'].startswith(api_name + '.')
         for call in sample['api_calls'])]
 
   def _CreateSamplesDict(self, key):
     if key == 'apps':
-      samples_list = self._apps_cache.GetFromFileListing('/').Get()
+      samples_list = self._apps_cache.GetFromFileListing('').Get()
     else:
       samples_list = self._extensions_cache.GetFromFileListing(EXAMPLES).Get()
     return_list = []
     for dict_ in samples_list:
       name = dict_['name']
       description = dict_['description']
       if description is None:
         description = ''
       if name.startswith('__MSG_') or description.startswith('__MSG_'):
         try:
@@ skipping 18 matching lines @@
       else:
         dict_['id'] = self._GetSampleId(name)
         return_list.append(dict_)
     return return_list
 
   def get(self, key):
     return {
       'apps': lambda: self._CreateSamplesDict('apps'),
       'extensions': lambda: self._CreateSamplesDict('extensions')
     }.get(key, lambda: {})()