st_api: Add get param function to st_manager

src/gallium/include/state_tracker/st_api.h

@@ -105,6 +105,13 @@ enum st_context_resource_type {
    ST_CONTEXT_RESOURCE_OPENVG_PARENT_IMAGE
 };
 
+/**
+ * Value to st_manager->get_param function.
+ */
+enum st_manager_param {
+   ST_MANAGER_TEMP,
+};
+
 /**
  * The return type of st_api->get_proc_address.
  */
@@ -319,6 +326,12 @@ struct st_manager
     */
    boolean (*get_egl_image)(struct st_manager *smapi,
                             struct st_egl_image *stimg);
+
+   /**
+    * Query an manager param.
+    */
+   int (*get_param)(struct st_manager *smapi,
+                    enum st_manager_param param);
 };
 
 /**