4197755: Arc2D.getBounds() returns an unnecessarily large bounding box

[mickleness]

4197755 is marked as a duplicate of JDK-8176501 , but I think that is a mistake. The complaint in that ticket still reproduces, and it is resolved in this PR.

The complaint is: Arc2D.getBounds() is too large. If an Arc2D represents a small slice of an ellipse, then Arc2D.getBounds() always returns the size of the total ellipse. Arc2D.getBounds2D(), by contrast, has been "high-precision" for decades.

This PR makes Arc2D.getBounds() resemble the same implementation already used in Area, CubicCurve2D, Line2D, Path2D, and QuadCurve2D:

    public Rectangle getBounds() {
        return getBounds2D().getBounds();
    }

This modifies (simplifies) the javadoc for Arc2D.getBounds2D(). If we generally like this PR I assume we'll need a CSR to approve the javadoc change.

---

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Issue

• JDK-4197755: Arc2D.getBounds() returns an unnecessarily large bounding box (Bug - P4) ⚠️ Issue is not open.

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[bridgekeeper]

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[mlbridge]

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• 00: Full (abe14a2d)

[bourgesl]

LGTM