Merge "Add camera ping command and release message."

     * arg1 = 0 will disable, while passing arg1 = 1 will enable the callback.

     */

    CAMERA_CMD_ENABLE_FOCUS_MOVE_MSG = 8,

    /**

     * Ping camera service to see if camera hardware is released.

     *

     * When any camera method returns error, the client can use ping command

     * to see if the camera has been taken away by other clients. If the result

     * is NO_ERROR, it means the camera hardware is not released. If the result

     * is not NO_ERROR, the camera has been released and the existing client

     * can silently finish itself or show a dialog.

     */

    CAMERA_CMD_PING = 9,

};

/** camera fatal errors */

enum {

    CAMERA_ERROR_UNKNOWN = 1,

    /**

     * Camera was released because another client has connected to the camera.

     * The original client should call Camera::disconnect immediately after

     * getting this notification. Otherwise, the camera will be released by

     * camera service in a short time. The client should not call any method

     * (except disconnect and sending CAMERA_CMD_PING) after getting this.

     */

    CAMERA_ERROR_RELEASED = 2,

    CAMERA_ERROR_SERVER_DIED = 100

};