windows: Add UMA metrics for first-run bubble. 
windows: Add UMA metrics for first-run bubble. 

So we will know which of the buttons the user clicked on. 

BUG=23643
TEST=none 

Patch from Thiago Farina <thiago.farina@gmail.com> 

TBR=ben
Review URL: http://codereview.chromium.org/975002

git-svn-id: dd90618784b6a4b323ea0c23a071cb1c9e6f2ac7@41612 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