Setup basic Runtime with properties and platform.

recipe_engine/types.py

Index: recipe_engine/types.py
diff --git a/recipe_engine/types.py b/recipe_engine/types.py
index 7859af93324fd84ddec8419319ca5583c4927798..693ae36b1434d49b8657b46fe70fea5403f71db9 100644
--- a/recipe_engine/types.py
+++ b/recipe_engine/types.py
@@ -71,6 +71,14 @@ class FrozenDict(collections.Mapping):
   def __repr__(self):
     return 'FrozenDict(%r)' % (self._d.items(),)
 
+  def to_json(self, **kw):
+    """Returns (str): a JSON string containing the encoded FrozenDict.
+
+    Args:
+      kw: Keyword arguments to forward to "json.dumps".
+    """
+    return json.dumps(self._d, **kw)
+
 
 class StepPresentation(object):
   STATUSES = set(('SUCCESS', 'FAILURE', 'WARNING', 'EXCEPTION'))