Adding explicit isHidden and setHidden method to AggregatedIssues
Adding explicit isHidden and setHidden method to AggregatedIssues

This change removes the possibility of the aggregatedIssue and representative issues hidden status getting out of sync.

Bug: 1175722
Change-Id: Ib9e165d485c672e57bfb3ec64c26bd4ae59bf588
Reviewed-on: https://chromium-review.googlesource.com/c/devtools/devtools-frontend/+/3087351
Reviewed-by: Sigurd Schneider <f04d242e109628a27a0f75fd49a87722bcf291fd@chromium.org>
Commit-Queue: Sigurd Schneider <f04d242e109628a27a0f75fd49a87722bcf291fd@chromium.org>

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