camera: adjust focus timeout for faster clicks

    private boolean previewIsVideoMode;

    private AutoFocusCallback autofocus_cb;

    private long autofocus_time_ms = -1; // time we set autofocus_cb to non-null

    private static final long autofocus_timeout_c = 1000; // timeout for calling autofocus_cb (applies for both auto and continuous focus)

    private static final long autofocus_timeout_c = 250; // timeout for calling autofocus_cb (applies for both auto and continuous focus)

    private boolean capture_follows_autofocus_hint;

    private boolean ready_for_capture;

    private FaceDetectionListener face_detection_listener;

    private static final int STATE_WAITING_FAKE_PRECAPTURE_DONE = 5;

    private int state = STATE_NORMAL;

    private long precapture_state_change_time_ms = -1; // time we changed state for precapture modes

    private static final long precapture_start_timeout_c = 2000;

    private static final long precapture_done_timeout_c = 3000;

    private static final long precapture_start_timeout_c = 500;

    private static final long precapture_done_timeout_c = 1000;

    private boolean use_fake_precapture; // see CameraController.setUseCamera2FakeFlash() for details - this is the user/application setting, see use_fake_precapture_mode for whether fake precapture is enabled (as we may do this for other purposes, e.g., front screen flash)

    private boolean use_fake_precapture_mode; // true if either use_fake_precapture is true, or we're temporarily using fake precapture mode (e.g., for front screen flash or exposure bracketing)