Don't cause requestLayout when transition changes Visibility.

Bug 21400515

When a Visibility transition temporarily changes a View's
visibility, it should not cause a requestLayout or any other
action, such as focus change. This adds a hidden method to
View to allow it to tweak the visibility without causing
other side-effects.

Change-Id: I5a06149983051319080130e5b5e7cc7edda8dd3e