Making switchState public

Bug: 7208910

switchState was only accessible within package com.android.gallery3d.app . Now
changing it to public so that it can be called from camera. This is part 1 of 2
in fixing the bug. Not sure if it's the best way to fix it. Comments are welcome.

Change-Id: I4aac46f640f2dd3aa973abd9610a37fa2842ed29