Cross-repo recipe package system.

scripts/slave/recipes/chromium.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.
 
 DEPS = [
   'adb',
   'amp',
   'bisect_tester',
   'chromium',
   'chromium_android',
   'chromium_tests',
+  'file',
   'isolate',
   'json',
   'path',
   'platform',
   'properties',
   'python',
   'raw_io',
   'step',
   'swarming',
   'test_utils',
 ]
 
+from recipe_engine import config_types
+
+def ignore_undumpable(obj):  # pragma: no cover
+  try:
+    return config_types.json_fixup(obj)
+  except TypeError:
+    return None
+
 
 def RunSteps(api):
+  # build/tests/masters_recipes_tests.py needs to manipulate the BUILDERS
+  # dict, so we provide an API to dump it here.
+  if api.properties.get('dump_builders'):  # pragma: no cover
+    api.file.write(
+        'Dump BUILDERS dict', api.properties['dump_builders'],
+        api.json.dumps(api.chromium_tests.builders, default=ignore_undumpable))
+    return
+
   mastername = api.properties.get('mastername')
   buildername = api.properties.get('buildername')
 
   if mastername == 'tryserver.chromium.perf' and api.chromium_tests.builders[
       mastername]['builders'][buildername]['bot_type'] == 'tester':
     api.bisect_tester.upload_job_url()
 
   api.chromium_tests.configure_build(mastername, buildername)
   update_step, master_dict, test_spec = \
       api.chromium_tests.prepare_checkout(mastername, buildername)
@@ skipping 489 matching lines @@
   yield (
     api.test('amp_split_recipe_collect_failure') +
     api.properties(
         mastername='chromium.fyi',
         buildername='Android Tests (amp split)',
         slavename='build1-a1',
         buildnumber='77457',
         parent_build_archive_url='gs://test-domain/test-archive.zip'
     ) +
     api.override_step_data('[collect] base_unittests', retcode=1)
-  )
+  )