Like the other send methods, these methods need to be able to indicate to the caller that the send failed.
Deviation from the current specification draft
http://java.net/jira/browse/WEBSOCKET_SPEC-121

git-svn-id: https://svn.apache.org/repos/asf/tomcat/trunk@1436843 13f79535-47bb-0310-9956-ffa450edef68