chromium_tests: automatically set up test genrators

scripts/slave/recipe_modules/chromium_tests/bot_config_and_test_db.py

Index: scripts/slave/recipe_modules/chromium_tests/bot_config_and_test_db.py
diff --git a/scripts/slave/recipe_modules/chromium_tests/bot_config_and_test_db.py b/scripts/slave/recipe_modules/chromium_tests/bot_config_and_test_db.py
index 9a396b6e2ceeeeb760a5384f59e21a419f656df9..b607b4776c1a3ea3b14779bbeafc441a0e64b28c 100644
--- a/scripts/slave/recipe_modules/chromium_tests/bot_config_and_test_db.py
+++ b/scripts/slave/recipe_modules/chromium_tests/bot_config_and_test_db.py
@@ -75,6 +75,14 @@ class BotConfig(object):
       scripts_compile_targets = \
           chromium_tests_api.get_compile_targets_for_scripts().json.output
 
+    test_generators = [
+      chromium_tests_api.steps.generate_gtest,
+      chromium_tests_api.steps.generate_instrumentation_test,
+      chromium_tests_api.steps.generate_junit_test,
+      chromium_tests_api.steps.generate_script,
+      chromium_tests_api.steps.generate_isolated_script,
+    ]
+
     masternames = set(bot_id['mastername'] for bot_id in self._bot_ids)
     for mastername in sorted(self._bots_dict):
       # We manually thaw the path to the elements we are modifying, since the
@@ -98,7 +106,7 @@ class BotConfig(object):
                   self.get('enable_swarming', False),
                   builder_dict.get('swarming_dimensions', {}),
                   scripts_compile_targets,
-                  builder_dict.get('test_generators', []),
+                  test_generators,
                   bot_update_step
               ))
       else: