Hide swipe-up gesture behind tuner flag

    <!-- Description for the toggle to set the initial scroll state to be paging or stack. DO NOT TRANSLATE -->

    <string name="overview_initial_state_paging_desc">Determines whether Overview will initially be in a stacked or paged state</string>

    <!-- Toggle to enable the gesture to enter split-screen by swiping up from the Overview button. [CHAR LIMIT=60]-->

    <string name="overview_nav_bar_gesture">Enable split-screen swipe-up accelerator</string>

    <!-- Description for the toggle to enable the gesture to enter split-screen by swiping up from the Overview button. [CHAR LIMIT=NONE]-->

    <string name="overview_nav_bar_gesture_desc">Enable gesture to enter split-screen by swiping up from the Overview button</string>

    <!-- Category in the System UI Tuner settings, where new/experimental

         settings are -->

    <string name="experimental">Experimental</string>

            android:title="@string/overview_fast_toggle_via_button"

            android:summary="@string/overview_fast_toggle_via_button_desc" />

        <com.android.systemui.tuner.TunerSwitch

            android:key="overview_nav_bar_gesture"

            android:title="@string/overview_nav_bar_gesture"

            android:summary="@string/overview_nav_bar_gesture_desc" />

    </PreferenceScreen>

    <SwitchPreference

    public void onTuningChanged(String key, String newValue) {

        switch (key) {

            case KEY_DOCK_WINDOW_GESTURE:

                mDockWindowEnabled = (newValue == null) ||

                        (Integer.parseInt(newValue) != 0);

                mDockWindowEnabled = newValue != null && (Integer.parseInt(newValue) != 0);

                break;

        }

    }