Merge "Camera: Clarify AF_REGIONS behavior in capture_result"

     * is used, all non-zero weights will have the same effect. A region with 0 weight is

     * ignored.</p>

     * <p>If all regions have 0 weight, then no specific metering area needs to be used by the

     * camera device.</p>

     * camera device. The capture result will either be a zero weight region as well, or

     * the region selected by the camera device as the focus area of interest.</p>

     * <p>If the metering region is outside the used ACAMERA_SCALER_CROP_REGION returned in

     * capture result metadata, the camera device will ignore the sections outside the crop

     * region and output only the intersection rectangle as the metering region in the result