RFR: 6364: Improvements to the Thread Graph [v6]

[Alex Macdonald]

On Tue, 3 Nov 2020 03:40:42 GMT, Guru Hb <ghb at openjdk.org> wrote:

>> Alex Macdonald has updated the pull request incrementally with two additional commits since the last revision:
>> 
>>  - applied patch from Guru
>>  - fix tests when chart gets reset
>
> Changes looks good, Sanity test done on MacOS and Windows.

@guruhb Thank you for the review, I'll integrate this momentarily

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PR: https://git.openjdk.java.net/jmc/pull/27