use darker blue for 'pressed' state

But first, I had to prevent using a custom 'mSelected' state from
bypassing the usual selector. Now, the 'selected' state corresponds with
whether an item is in the selection set.

Bug: 8853914
Change-Id: I3b564c92d5e3697a10b70fe1af5e5ed9f56c3e15
3 files changed