Fix bug 3259354 - Handle ActionBar backgrounds better for interacting

with action modes.

Tweak ActionBar/mode transition animation to look better with a
variety of action bar styles.

Fix bug 3273773 - ActionBar disappearing while displaying
popupwindow. Some SurfaceFlinger optimizations require a relayout to
recalculate the bounds of overlaid views.

Fix bug 3266010 - Cancel animations properly when switching between
modes.

Change-Id: Ic431176b11115a2211bd0a46d09c8998aefe58d6