Mirror clock API from Node to LifecycleNode (#417)

* Mirror clock API from Node to LifecycleNode

Follow up to #407

* adding headers for completeness

rclcpp/include/rclcpp/node.hpp

@@ -35,6 +35,7 @@
 
 #include "rclcpp/callback_group.hpp"
 #include "rclcpp/client.hpp"
+#include "rclcpp/clock.hpp"
 #include "rclcpp/context.hpp"
 #include "rclcpp/event.hpp"
 #include "rclcpp/logger.hpp"
@@ -52,6 +53,7 @@
 #include "rclcpp/publisher.hpp"
 #include "rclcpp/service.hpp"
 #include "rclcpp/subscription.hpp"
+#include "rclcpp/time.hpp"
 #include "rclcpp/timer.hpp"
 #include "rclcpp/visibility_control.hpp"
 

rclcpp/src/rclcpp/node.cpp

@@ -216,7 +216,6 @@ Node::now()
   return node_clock_->get_clock()->now();
 }
 
-
 rclcpp::node_interfaces::NodeBaseInterface::SharedPtr
 Node::get_node_base_interface()
 {
@@ -229,7 +228,6 @@ Node::get_node_clock_interface()
   return node_clock_;
 }
 
-
 rclcpp::node_interfaces::NodeGraphInterface::SharedPtr
 Node::get_node_graph_interface()
 {