Set the AE precapture triggler tag in the android result metadata according to what was passed in the request metadata. This allows the following CTS test to pass: - android.hardware.camera2.cts.StillCaptureTest#testAePrecaptureTriggerCancelJpegCapture Signed-off-by: Paul Elder <paul.elder@ideasonboard.com> Reviewed-by: Jacopo Mondi <jacopo@jmondi.org>