Cas Client repo update-2.

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

plugin/include/cas_media_id.h

@@ -15,6 +15,9 @@ class CasMediaId {
   virtual CasStatus initialize(const std::string& init_data) = 0;
   virtual const std::string content_id() = 0;
   virtual const std::string provider_id() = 0;
+  virtual bool is_entitlement_rotation_enabled() { return false; }
+  virtual uint32_t entitlement_period_index() = 0;
+  virtual std::string get_init_data() = 0;
 };
 
 }  // namespace wvcas