Merge "Throw an exception if a both nav and system bars are configured"

        sb.setHandler(mHandler);

        // Sanity-check that someone hasn't set up the config wrong and asked for a navigation bar

        // on a tablet that has only the system bar

        if (mContext.getResources().getBoolean(

                com.android.internal.R.bool.config_showNavigationBar)) {

            throw new RuntimeException("Tablet device cannot show navigation bar and system bar");

        }

        mBarContents = (ViewGroup) sb.findViewById(R.id.bar_contents);

        // layout transitions for the status bar's contents

        mBarContentsLayoutTransition = new LayoutTransition();