Move recipe engine to third_party/recipe_engine.

scripts/slave/recipe_modules/math_utils/api.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.
 
 """General statistical or mathematical functions."""
 
 import math
 
-from slave import recipe_api
+from recipe_engine import recipe_api
 
 
 class MathUtilsApi(recipe_api.RecipeApi):
 
   @staticmethod
   def truncated_mean(data_set, truncate_fraction):
     """Calculates the truncated mean of a set of values.
 
     Note that this isn't just the mean of the set of values with the highest
     and lowest values discarded; the non-discarded values are also weighted
@@ skipping 328 matching lines @@
       lesser_equal = [n for n in nums if n <= target]
       assert lesser_equal, 'No number in number list <= target.'
       return max(lesser_equal)
 
     df_key = greatest_smaller(MathUtilsApi.TABLE.keys(), df)
     t_table_row = MathUtilsApi.TABLE[df_key]
     approximate_t_value = greatest_smaller(t_table_row, t)
     t_value_index = t_table_row.index(approximate_t_value)
 
     return MathUtilsApi.TWO_TAIL[t_value_index]