RFR: 7532: Delay in realtime rendering of graphs in JMX Console

[Virag Purnam]

Issue: Dials and Charts in JMX Console was not rendering with the change. 

<img width="1302" alt="image-2022-01-18-21-36-49-712" src="https://user-images.githubusercontent.com/97600378/152590022-262d4ce1-fe1a-4b52-bb43-d1b61b96d4d0.png">
 
Root cause: Control redraw() method was conditionally called. This method was called for windows and Linux OS. For mac OS, this redraw() method was not called to solve "console dials causing high CPU load on Mac". But because of this rendering was not happening for dials and charts. 
I do not see any high CPU load (May be issue with older versions of OS). Could you please review the changes and let me know if you see any performance issue with this fix (mainly on macOS) ? 

Fix: Control redraw() method has been called for macOS as well.

<img width="928" alt="Fix_7532" src="https://user-images.githubusercontent.com/97600378/152590703-0c385f22-be14-4ad6-b592-927c37fa2385.png">

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Commit messages:
 - 7532: Delay in realtime rending of graphs  in JMX Console
 - 7532: Delay in realtime rending of graphs  in JMX Console

Changes: https://git.openjdk.java.net/jmc/pull/375/files
 Webrev: https://webrevs.openjdk.java.net/?repo=jmc&pr=375&range=00
  Issue: https://bugs.openjdk.java.net/browse/JMC-7532
  Stats: 34 lines in 2 files changed: 0 ins; 24 del; 10 mod
  Patch: https://git.openjdk.java.net/jmc/pull/375.diff
  Fetch: git fetch https://git.openjdk.java.net/jmc pull/375/head:pull/375

PR: https://git.openjdk.java.net/jmc/pull/375