Implement functions to return the primary display dimensions and the number of displays connected.
Implement functions to return the primary display dimensions and the number
of displays connected.

BUG=21731
TEST=No more NOTIMPLEMENTED messages for these.
     Metrics data should have the correct values in log.display.
Review URL: http://codereview.chromium.org/194098

git-svn-id: dd90618784b6a4b323ea0c23a071cb1c9e6f2ac7@26092 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