First step towards moving v8 extensions out of WebCore. 
First step towards moving v8 extensions out of WebCore. 

Adds a registerExtension function available in our WebKit public API. 
Once this is in place, another changelist will include actually using it. 

R=mbelshe,darin


Review URL: http://codereview.chromium.org/39070

git-svn-id: dd90618784b6a4b323ea0c23a071cb1c9e6f2ac7@10868 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