Swarming: conditionally run tests on swarming in chromium_trybot recipe.

scripts/slave/recipe_modules/isolate/test_api.py

Index: scripts/slave/recipe_modules/isolate/test_api.py
diff --git a/scripts/slave/recipe_modules/isolate/test_api.py b/scripts/slave/recipe_modules/isolate/test_api.py
index 1248df84d70223281d5b7edb50c2f6b4c28f8c85..e3ecdb29ce310fa7f41fa3c3d5a41073bb46e9fc 100644
--- a/scripts/slave/recipe_modules/isolate/test_api.py
+++ b/scripts/slave/recipe_modules/isolate/test_api.py
@@ -6,9 +6,9 @@ from slave import recipe_test_api
 
 class IsolateTestApi(recipe_test_api.RecipeTestApi):
   def output_json(self, targets=None):
-    """Mocked output or find_isolated_tests.py script.
+    """Mocked output of find_isolated_tests.py script.
 
-    Deterministically synthesized json.output test data for the given targets.
+    Deterministically synthesizes json.output test data for the given targets.
     If |targets| is None, will emit test data with some dummy targets instead,
     emulating find_isolated_tests.py finding some files.
     """