recipe engine: add a hook for initializing recipe module with injected deps

recipe_engine/loader.py

-# Copyright 2013-2015 The Chromium Authors. All rights reserved.
+# 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.
 
 import collections
 import contextlib
 import imp
 import inspect
 import os
 import sys
 
@@ skipping 509 matching lines @@
       'test_data': test_data.get_module_test_data(mod.NAME)
     }
     prop_defs = mod.PROPERTIES
     mod_api = invoke_with_properties(
       mod.API, engine.properties, prop_defs, **kwargs)
     mod_api.test_api = (getattr(mod, 'TEST_API', None)
                         or RecipeTestApi)(module=mod)
     for k, v in deps.iteritems():
       setattr(mod_api.m, k, v)
       setattr(mod_api.test_api.m, k, v.test_api)
+    mod_api.initialize()
     return mod_api
 
   mapper = DependencyMapper(instantiator)
   api = RecipeScriptApi(module=None, engine=engine,
                   test_data=test_data.get_module_test_data(None))
   for k, v in toplevel_deps.iteritems():
     setattr(api, k, mapper.instantiate(v))
   return api
 
 
 def create_test_api(toplevel_deps, universe):
   def instantiator(mod, deps):
     modapi = (getattr(mod, 'TEST_API', None) or RecipeTestApi)(module=mod)
     for k,v in deps.iteritems():
       setattr(modapi.m, k, v)
     return modapi
 
   mapper = DependencyMapper(instantiator)
   api = RecipeTestApi(module=None)
   for k,v in toplevel_deps.iteritems():
     setattr(api, k, mapper.instantiate(v))
   return api