[Findit] Add skeleton code for delta test script.

appengine/findit/common/cache_decorator.py

 # Copyright 2015 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.
 
 """This module provides a decorator to cache the results of a function.
 
   Examples:
   1. Decorate a function:
     @cache_decorator.Cached()
     def Test(a):
@@ skipping 119 matching lines @@
       all_data[key] = compressed_data
 
     keys_not_set = memcache.set_multi(all_data, time=expire_time)
     return len(keys_not_set) == 0
 
 
 def _DefaultKeyGenerator(func, args, kwargs):
   """Generates a key from the function and arguments passed to it.
 
   Args:
-    func (function): An arbitrary function.
+    func (function): An abitrary function.

[wrengr, 2016/10/11 22:57:43]

was correct before: "arbitrary"

[Sharu Jiang, 2016/10/12 01:18:20]

Done.

[lijeffrey, 2016/10/20 15:52:14]

nit: the previous spelling was correct

     args (list): Positional arguments passed to ``func``.
     kwargs (dict): Keyword arguments passed to ``func``.
 
   Returns:
     A string to represent a call to the given function with the given arguments.
   """
   params = inspect.getcallargs(func, *args, **kwargs)
   for var_name in params:
     if not hasattr(params[var_name], 'identifier'):
       continue
@@ skipping 68 matching lines @@
         except Exception:  # pragma: no cover.
           logging.exception(
               'Failed to cache data for function %s.%s, args=%s, kwargs=%s',
               func.__module__, func.__name__, repr(args), repr(kwargs))
 
       return result
 
     return Wrapped
 
   return Decorator