Cas Client repo update-2.

-Parse EMM in Cas plugin
-Entitlement key rotation support
-Multi_content_license support

plugin/include/ecm_parser.h

@@ -48,6 +48,10 @@ class EcmParser {
   // The serialized payload that the signature is calculated on.
   virtual std::string ecm_serialized_payload() const = 0;
   virtual std::string signature() const = 0;
+
+  virtual bool is_entitlement_rotation_enabled() const = 0;
+  virtual uint32_t entitlement_period_index() const = 0;
+  virtual uint32_t entitlement_rotation_window_left() const = 0;
 };
 
 }  // namespace wvcas