RFR: JDK-8016524: [macosx] Bottom line is not visible for JTableHeader [v2]

[Harshitha Onkar]

> A new test case was added to test the fix as there was no corresponding test case present for this issue previously.

Harshitha Onkar has updated the pull request incrementally with one additional commit since the last revision:

  added white background to table and header

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Changes:
  - all: https://git.openjdk.java.net/jdk/pull/7219/files
  - new: https://git.openjdk.java.net/jdk/pull/7219/files/1d1c6329..8f306a5b

Webrevs:
 - full: https://webrevs.openjdk.java.net/?repo=jdk&pr=7219&range=01
 - incr: https://webrevs.openjdk.java.net/?repo=jdk&pr=7219&range=00-01

  Stats: 238 lines in 2 files changed: 122 ins; 116 del; 0 mod
  Patch: https://git.openjdk.java.net/jdk/pull/7219.diff
  Fetch: git fetch https://git.openjdk.java.net/jdk pull/7219/head:pull/7219

PR: https://git.openjdk.java.net/jdk/pull/7219