MoveAbove/SetAlwaysOnTop implementation for WidgetGtk
MoveAbove/SetAlwaysOnTop implementation for WidgetGtk

BUG=none
TEST=none

Review URL: http://codereview.chromium.org/548164

git-svn-id: http://src.chromium.org/svn/trunk/src@37312 4ff67af0-8c30-449e-8e8b-ad334ec8d88c

Former-commit-id: a2a64d028c2f83b1817d2a04f98aa65694ea102f
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