Setup basic Runtime with properties and platform.

recipe_engine/recipe_api.py

Index: recipe_engine/recipe_api.py
diff --git a/recipe_engine/recipe_api.py b/recipe_engine/recipe_api.py
index 8827e4c4cf81994edf679d5d216406a3d7829fd6..7f5bbc003677176a965b7d07d77d889651251848 100644
--- a/recipe_engine/recipe_api.py
+++ b/recipe_engine/recipe_api.py
@@ -88,11 +88,11 @@ class PropertiesClient(object):
 
   IDENT = 'properties'
 
-  def __init__(self, engine):
-    self._engine = engine
+  def __init__(self, properties):
+    self._properties = properties
 
   def get_properties(self):
-    return copy.deepcopy(self._engine.properties)
+    return copy.deepcopy(self._properties)
 
 
 class StepClient(object):
@@ -127,6 +127,31 @@ class StepClient(object):
     return self._engine.run_step(StepConfig.create(**step_dict))
 
 
+class PlatformClient(object):
+  """A recipe engine client to expose a common view of the running platform."""
+
+  IDENT = 'platform'
+
+  def __init__(self, plat):
+    self._plat = plat
+
+    # Export normalization methods.
+    self.norm_plat = plat.norm_plat
+    self.norm_bits = plat.norm_bits
+
+  @property
+  def name(self):
+    return self._plat.name
+
+  @property
+  def bits(self):
+    return self._plat.bits
+
+  @property
+  def arch(self):
+    return self._plat.arch
+
+
 class DependencyManagerClient(object):
   """A recipe engine client representing the dependency manager."""