Send mouse press and mouse release event to backend "in pair" to avoid potential issue in flash etc, which was reported by raymond.
Send mouse press and mouse release event to backend "in pair" to avoid potential issue in flash etc, which was reported by raymond.


Former-commit-id: cce955c98768e2ebaf5c30e398fa95e7c7c1d56a
meego-tablet-ux/meego-app-browser,meego-tablet-ux/meego-app-browser,meego-tablet-ux/meego-app-browser,meego-tablet-ux/meego-app-browser,meego-tablet-ux/meego-app-browser,meego-tablet-ux/meego-app-browser,meego-tablet-ux/meego-app-browser,meego-tablet-ux/meego-app-browser,meego-tablet-ux/meego-app-browser,meego-tablet-ux/meego-app-browser