Instead of percentages, each bubble should adopt the 'worst' of it's child results.
Created attachment 380229 [details] Patch
unofficially r=me
rs=me
Created attachment 380240 [details] Patch for landing
Comment on attachment 380240 [details] Patch for landing Clearing flags on attachment: 380240 Committed r250744: <https://trac.webkit.org/changeset/250744>
All reviewed patches have been landed. Closing bug.
<rdar://problem/55994118>