Fix bug 5122319 - When action bar tabs run out of space they should

collapse in to a spinner.

When tabs are not given the option of dropping to their own row,
collapse them into a spinner when they would measure too large to be
visible all at once.

Fix bug 5095167 - zombie tabs return when they shouldn't when activity
handles its own orientation changes

Change-Id: I074419d99a22aa5dd1cbc00a66e600ec5cb0b54a