RFR: 4197755: Arc2D.getBounds() returns an unnecessarily large bounding box [v2]

[Jeremy Wood]

> 4197755 is marked as a duplicate of [JDK-8176501](https://bugs.openjdk.org/browse/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.

Jeremy Wood has updated the pull request incrementally with one additional commit since the last revision:

  4197755: Updating copyright year

-------------

Changes:
  - all: https://git.openjdk.org/jdk/pull/26715/files
  - new: https://git.openjdk.org/jdk/pull/26715/files/abe14a2d..de609581

Webrevs:
 - full: https://webrevs.openjdk.org/?repo=jdk&pr=26715&range=01
 - incr: https://webrevs.openjdk.org/?repo=jdk&pr=26715&range=00-01

  Stats: 2 lines in 2 files changed: 0 ins; 0 del; 2 mod
  Patch: https://git.openjdk.org/jdk/pull/26715.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/26715/head:pull/26715

PR: https://git.openjdk.org/jdk/pull/26715