ticket:10394: branch for API promotion

git-svn-id: http://source.icu-project.org/repos/icu/icu/branches/srl@34296 251d0590-4201-4cf1-90de-194747b24ca1
ticket:10394: proposed API promotion.

git-svn-id: http://source.icu-project.org/repos/icu/icu/branches/srl@34297 251d0590-4201-4cf1-90de-194747b24ca1