Add support for reporting the use of deprecated types, methods, and fields from within JSNI methods.
Support the @SuppressWarnings annotation on native methods.

Patch by: bobv
Review by: scottb


git-svn-id: https://google-web-toolkit.googlecode.com/svn/trunk@4958 8db76d5a-ed1c-0410-87a9-c151d255dfc7