RFR: 8287743: javax/swing/text/CSSBorder/6796710/bug6796710.java failed [v4]

[Prasanta Sadhukhan]

> Test is failing in iMac CI systems owing to color difference of 1
> 
> `x 0 y 0 rgb1: fff0f0f0 rgb2: fff0eff0`
> 
> Added minor color tolerance check. CI testing is green

Prasanta Sadhukhan has updated the pull request incrementally with two additional commits since the last revision:

 - Fix review comments
 - Fix review comments

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

Changes:
  - all: https://git.openjdk.org/jdk/pull/9011/files
  - new: https://git.openjdk.org/jdk/pull/9011/files/afd6fb93..51c37d95

Webrevs:
 - full: https://webrevs.openjdk.java.net/?repo=jdk&pr=9011&range=03
 - incr: https://webrevs.openjdk.java.net/?repo=jdk&pr=9011&range=02-03

  Stats: 10 lines in 1 file changed: 1 ins; 3 del; 6 mod
  Patch: https://git.openjdk.org/jdk/pull/9011.diff
  Fetch: git fetch https://git.openjdk.org/jdk pull/9011/head:pull/9011

PR: https://git.openjdk.org/jdk/pull/9011