Add wake gesture as a hidden sensor in Sensor.java

     */

    public static final String STRING_TYPE_HEART_RATE = "android.sensor.heart_rate";

    /**

     * A constant describing a wake gesture sensor.

     * <p>

     * Wake gesture sensors enable waking up the device based on a device specific motion.

     * <p>

     * When this sensor triggers, the device behaves as if the power button was pressed, turning the

     * screen on. This behavior (turning on the screen when this sensor triggers) might be

     * deactivated by the user in the device settings. Changes in settings do not impact the

     * behavior of the sensor: only whether the framework turns the screen on when it triggers.

     * <p>

     * The actual gesture to be detected is not specified, and can be chosen by the manufacturer of

     * the device. This sensor must be low power, as it is likely to be activated 24/7.

     * Values of events created by this sensors should not be used.

     *

     * @hide This sensor is expected to only be used by the power manager

     */

    public static final int TYPE_WAKE_GESTURE = 42;

    /**

     * A constant string describing a wake gesture sensor.

     *

     * @hide This sensor is expected to only be used by the power manager

     * @see #TYPE_WAKE_GESTURE

     */

    public static final String STRING_TYPE_WAKE_GESTURE = "android.sensor.wake_gesture";

    /**

     * A constant describing all sensor types.

     */