Move recipe engine to third_party/recipe_engine.

scripts/slave/recipe_modules/generator_script/api.py

 # Copyright 2013 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 recipe_engine import recipe_api
 
 class GeneratorScriptApi(recipe_api.RecipeApi):
   def __call__(self, path_to_script, *args, **kwargs):
     """Run a script and generate the steps emitted by that script.
 
     If a step has a key 'outputs_presentation_json' whose value is
     True, its command is extended with a --presentation-json argument
     pointing to a file where it is expected to write presentation json
     which is used to update that step's presentation on the waterfall.
 
@@ skipping 58 matching lines @@
               p.links.update(j.get('links', {}))
               p.perf_logs.update(j.get('perf_logs', {}))
               p.step_summary_text = j.get('step_summary_text', '')
               p.step_text = j.get('step_text', '')
               p.properties.update(j.get('properties', {}))
 
     if failed_steps:
       raise self.m.step.StepFailure(
         "the following steps in %s failed: %s" %
         (step_name, failed_steps))