Add an OVERRIDE macro to our list of compiler-specific annotations.
Add an OVERRIDE macro to our list of compiler-specific annotations.

While I'm at it, add docs and examples to the other annotations.

Review URL: http://codereview.chromium.org/3581016

git-svn-id: dd90618784b6a4b323ea0c23a071cb1c9e6f2ac7@61964 4ff67af0-8c30-449e-8e8b-ad334ec8d88c

wistoch/meego-app-browser,wistoch/meego-app-browser,wistoch/meego-app-browser,wistoch/meego-app-browser,wistoch/meego-app-browser,wistoch/meego-app-browser,wistoch/meego-app-browser,wistoch/meego-app-browser,wistoch/meego-app-browser,wistoch/meego-app-browser