<Swing Dev> Add keyboard accessibility to JColorChooser swatch

[Sean Chou]

Hi all,

    This is a patch to add keyboard accessibility to JColorChooser swatch,
so when using TAB, the focus can move to SwatchPanel, choose color with
arrow keys and select color with space bar.

In current implementation, it is not able to move the focus to SwatchPanel
with TAB, this can be seen in SwingSet2 demo.
Steps:
1. run SwingSet2 demo
2. click on JColorChooser demo
3. click Background button and Swatches panel appears.
4. Press Tab key     =>   focus moves to OK button as shown in this image
http://cr.openjdk.java.net/~zhouyx/OJDK-61/screenshot_1.png

With this patch, in step4, focus moves to SwatchPanel, as shown here
http://cr.openjdk.java.net/~zhouyx/OJDK-61/screenshot_2.png
Then, arrow keys can be used to choose color and select color by space bar.

The webrev is http://cr.openjdk.java.net/~zhouyx/OJDK-61/webrev.00/  .

Please take a look.


-- 
Best Regards,
Sean Chou
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