Bug 5061529 - Save/restore action view state for menu items across

invalidations.

This includes expand/collapse state.

Add CollapsibleActionView interface. Views can implement this to have
special behavior when they are presented as an expanding/collapsing
action view. This lets SearchView and others take care of fiddly
behavior (focus stealing; opening the IME) automatically without apps
needing to implement this themselves.

Change-Id: Ibbd1eb5fcf3e3a862419e9344ad50f896bd05e36