Merge "Camera: Clarify zoom and crop behavior for capture result" into sc-dev

     * ACAMERA_CONTROL_ZOOM_RATIO is not 1.0, and ACAMERA_SCALER_CROP_REGION is set to be

     * windowboxing, the camera framework will override the ACAMERA_SCALER_CROP_REGION to be

     * the active array.</p>

     * <p>In the capture request, if the application sets ACAMERA_CONTROL_ZOOM_RATIO to a

     * value != 1.0, the ACAMERA_CONTROL_ZOOM_RATIO tag in the capture result reflects the

     * effective zoom ratio achieved by the camera device, and the ACAMERA_SCALER_CROP_REGION

     * adjusts for additional crops that are not zoom related. Otherwise, if the application

     * sets ACAMERA_CONTROL_ZOOM_RATIO to 1.0, or does not set it at all, the

     * ACAMERA_CONTROL_ZOOM_RATIO tag in the result metadata will also be 1.0.</p>

     * <p>When the application requests a physical stream for a logical multi-camera, the

     * ACAMERA_CONTROL_ZOOM_RATIO in the physical camera result metadata will be 1.0, and

     * the ACAMERA_SCALER_CROP_REGION tag reflects the amount of zoom and crop done by the

     * physical camera device.</p>

     *

     * @see ACAMERA_CONTROL_AE_REGIONS

     * @see ACAMERA_CONTROL_ZOOM_RATIO