Mark missed calls as read on swipe.

When swiping to a new tab, if the previous tab that the user was in was
the call history tab, all missed calls are marked as read and the tab
count is updated. Also fixes b/27153608 and clearing of missed calls on
orientation change.

BUG=27136093
BUG=27153608
BUG=27154514

Change-Id: I5be31b1a3978784b941fb8e1af22f93fb6ca944a