[8u20] backport request for 8007563: When checking the default behaviour for a scroll tab layout and checking the 'opaque' checkbox, the area behind tabs is not red.

[sergey malenkov]

Hello,

This is a direct backport from jdk 9 to jdk 8u.

Issue: http://bugs.openjdk.java.net/browse/JDK-8007563
Webrev: http://cr.openjdk.java.net/~malenkov/8007563.9.0/
Changeset: http://hg.openjdk.java.net/jdk9/client/jdk/rev/39d72d463c71
Reviewers: Alexandr Scherbatiy, Sergey Bylokhov

Thanks,
SAM