Merge "Use custom interpolator for predictive back system animations" into main

    private final int mWindowScaleMarginX;

    private float mWindowScaleEndCornerRadius;

    private float mWindowScaleStartCornerRadius;

    private final Interpolator mProgressInterpolator = Interpolators.STANDARD_DECELERATE;

    private final Interpolator mProgressInterpolator = Interpolators.BACK_GESTURE;

    private final Interpolator mVerticalMoveInterpolator = new DecelerateInterpolator();

    private final PointF mInitialTouchPos = new PointF();