RFR: 8296275: Write a test to verify setAccelerator method of JMenuItem [v10]

[Naveen Narayanan]

> This testcase will
> 1) Verify setAccelerator method of JMenuitem.
> 2) Check that the selection of a menu item in the menu bar will generate action by a key combination of META+M.
> 
> Testing:
> Tested using Mach5(20 times per platform) in Mac OS, Linux and Windows and got all pass.

Naveen Narayanan has updated the pull request incrementally with one additional commit since the last revision:

  8296275: Review comments fixed.

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Changes:
  - all: https://git.openjdk.org/jdk/pull/11035/files
  - new: https://git.openjdk.org/jdk/pull/11035/files/fe62a7e3..0fc8e25e

Webrevs:
 - full: https://webrevs.openjdk.org/?repo=jdk&pr=11035&range=09
 - incr: https://webrevs.openjdk.org/?repo=jdk&pr=11035&range=08-09

  Stats: 2 lines in 1 file changed: 0 ins; 0 del; 2 mod
  Patch: https://git.openjdk.org/jdk/pull/11035.diff
  Fetch: git fetch https://git.openjdk.org/jdk pull/11035/head:pull/11035

PR: https://git.openjdk.org/jdk/pull/11035