Merge "Assume nav bar window is visible by default if the fragment doesn't exist" into qt-dev

        mSysUiStateFlags = 0;

        mSysUiStateFlags |= ActivityManagerWrapper.getInstance().isScreenPinningActive()

                ? SYSUI_STATE_SCREEN_PINNING : 0;

        mSysUiStateFlags |= (navBarFragment == null || !navBarFragment.isNavBarWindowVisible())

        mSysUiStateFlags |= (navBarFragment != null && !navBarFragment.isNavBarWindowVisible())

                ? SYSUI_STATE_NAV_BAR_HIDDEN : 0;

        mSysUiStateFlags |= panelExpanded

                ? SYSUI_STATE_NOTIFICATION_PANEL_EXPANDED : 0;