RFR: 6810: Create treemap viewer for JOverflow [v6]

[Marcus Hirt]

On Wed, 17 Jun 2020 20:33:01 GMT, Alex Macdonald <aptmac at openjdk.org> wrote:

>> Kangcheng Xu has updated the pull request incrementally with one additional commit since the last revision:
>> 
>>   made spotless happy
>
> Looks good to me, thanks for making the changes.
> 
> I'll open a new bug for this (or take a look if one exists already ..) because it's outside of the scope of this patch,
> but it would be nice if newly added views automatically updated in response what's currently being viewed on screen.
> For example, if I had a JOverflow page open first and then I add the Treemap view, the treemap view has to wait for me
> to make a selection. Whereas if I had the Treemap view already open and then I opened an hprof file then the treemap
> view draws the default selection. This isn't a problem specific to the treemap view; it's easy to recreate with other
> optional views like the flameview for example.

What is the intended distribution model? Should this be something from the update site, or delivered as part of the
standard offering?

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PR: https://git.openjdk.java.net/jmc/pull/77