Move recipe engine to third_party/recipe_engine.

scripts/slave/recipe_modules/skia/api.py

Index: scripts/slave/recipe_modules/skia/api.py
diff --git a/scripts/slave/recipe_modules/skia/api.py b/scripts/slave/recipe_modules/skia/api.py
index 0ef52d5b84f3d9a7740746f824c0abacb45282c8..5b242b9e98ed80b8571acf44895aebd25aa521de 100644
--- a/scripts/slave/recipe_modules/skia/api.py
+++ b/scripts/slave/recipe_modules/skia/api.py
@@ -3,10 +3,12 @@
 # found in the LICENSE file.
 
 
-from slave import recipe_api
-from slave import recipe_config_types
-from common.skia import builder_name_schema
-from common.skia import global_constants
+import re
+import os
+import sys
+
+from recipe_engine import recipe_api
+from recipe_engine import recipe_config_types
 from . import android_flavor
 from . import chromeos_flavor
 from . import default_flavor
@@ -14,7 +16,13 @@ from . import ios_flavor
 from . import valgrind_flavor
 from . import xsan_flavor
 
-import re
+# TODO(luqui): Make this recipe stop depending on common so we can make it
+# independent of build/.
+sys.path.append(
+    os.path.dirname(os.path.dirname(os.path.dirname(os.path.dirname(
+        os.path.abspath(__file__))))))
+from common.skia import builder_name_schema
+from common.skia import global_constants
 
 
 # The gsutil recipe API uses a different gsutil version which does not work