Merge \"Add a WifiScanner API to listener for ongoing scans\" into nyc-mr1-dev

        void onPnoNetworkFound(ScanResult[] results);

    }

    /**

     * Register a listener that will receive results from all single scans

     * Either the onSuccess/onFailure will be called once when the listener is registered. After

     * (assuming onSuccess was called) all subsequent single scan results will be delivered to the

     * listener. It is possible that onFullResult will not be called for all results of the first

     * scan if the listener was registered during the scan.

     *

     * @param listener specifies the object to report events to. This object is also treated as a

     *                 key for this request, and must also be specified to cancel the request.

     *                 Multiple requests should also not share this object.

     * {@hide}

     */

    public void registerScanListener(ScanListener listener) {

        Preconditions.checkNotNull(listener, "listener cannot be null");

        int key = addListener(listener);

        if (key == INVALID_KEY) return;

        validateChannel();

        mAsyncChannel.sendMessage(CMD_REGISTER_SCAN_LISTENER, 0, key);

    }

    /**

     * Deregister a listener for ongoing single scans

     * @param listener specifies which scan to cancel; must be same object as passed in {@link

     *  #registerScanListener}

     * {@hide}

     */

    public void deregisterScanListener(ScanListener listener) {

        Preconditions.checkNotNull(listener, "listener cannot be null");

        int key = removeListener(listener);

        if (key == INVALID_KEY) return;

        validateChannel();

        mAsyncChannel.sendMessage(CMD_DEREGISTER_SCAN_LISTENER, 0, key);

    }

    /** start wifi scan in background

     * @param settings specifies various parameters for the scan; for more information look at

     * {@link ScanSettings}

    public static final int CMD_STOP_PNO_SCAN               = BASE + 25;

    /** @hide */

    public static final int CMD_PNO_NETWORK_FOUND           = BASE + 26;

    /** @hide */

    public static final int CMD_REGISTER_SCAN_LISTENER      = BASE + 27;

    /** @hide */

    public static final int CMD_DEREGISTER_SCAN_LISTENER    = BASE + 28;

    private Context mContext;

    private IWifiScanner mService;