Add tracing to the base pipeline handler class to track when requests are queued. Tracing is already available for other Request operations, but queuing a Request is not an operation handled by the Request itself. Add the tracepoint to the PipelineHandler::queueRequest() so the lifetime of a Request can be viewed when tracing. Signed-off-by: Kieran Bingham <kieran.bingham@ideasonboard.com> Reviewed-by: Paul Elder <paul.elder@ideasonboard.com> Signed-off-by: Kieran Bingham <kieran.bingham@ideasonboard.com>