Print opens the dialog. On iOS it returns when the dialog closes, and fails
with plugin.Cancelled if they back out. Android returns as it opens, and
can't tell.
type Options struct {
Name string `json:"name,omitempty"` // the job's name, shown in the dialog HTML string `json:"html,omitempty"` // a page to print PDF []byte `json:"pdf,omitempty"` // or a PDF to print}