Move recipe engine to third_party/recipe_engine.

scripts/slave/recipe_modules/raw_io/api.py

 # 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.
 
-from slave import recipe_api
-from slave import recipe_util
+from recipe_engine import recipe_api
+from recipe_engine import util as recipe_util
 
 import os
 import shutil
 import tempfile
 
 
 class InputDataPlaceholder(recipe_util.Placeholder):
   def __init__(self, data, suffix):
     assert isinstance(data, basestring)
     self.data = data
@@ skipping 133 matching lines @@
     """Returns a directory Placeholder for use as a step argument.
 
     If 'leak_to' is None, the placeholder is backed by a temporary dir with
     a suffix 'suffix'. The dir is deleted when the step finishes.
 
     If 'leak_to' is not None, then it should be a Path and placeholder
     redirects IO to a dir at that path. Once step finishes, the dir is
     NOT deleted (i.e. it's 'leaking'). 'suffix' is ignored in that case.
     """
     return OutputDataDirPlaceholder(suffix, leak_to)