Dimming deselected preview pages

For print preview we show the pages the user selected in the range
affordance but the user can optionally further prune pages to be
printed by deselecting them in the preview. The deselected pages
change elevation and now also are dimmed.

bug:15912256

Change-Id: I53357b8e8b592387bbc26b937eda786bb4660d85
2 files changed