Add state save/restore for Toolbar

Save and restore the menu state for Toolbars. This will make sure that
we remember expanded action views and opened overflow menus across
state save/restore.

Remove an extra event post involved in the initial population of
action bar menus. Apparently at some point an extra level of this was
added that isn't necessary. Process any pending menu invalidations
immediately when we perform window state restoration. This makes sure
individual bits of state in action views, etc. are also restored
properly.

Bug 12005461

Change-Id: Icf905698576b11a59641bc319adc62300857906f