Remove App.PaneController.bugsChangeCount in the new perf dashboard

Remove App.PaneController.bugsChangeCount in the new perf dashboard
https://bugs.webkit.org/show_bug.cgi?id=138111

Reviewed by Darin Adler.

* public/v2/app.js:
(App.PaneController.bugsChangeCount): Removed.
(App.PaneController.actions.associateBug): Call _updateMarkedPoints instead of incrementing bugsChangeCount.
(App.PaneController._updateMarkedPoints): Extracted from App.InteractiveChartComponent._updateDotsWithBugs.
Finds the list of current run's points that are associated with bugs.
(App.InteractiveChartComponent._updateMarkedDots): Renamed from _updateDotsWithBugs.
* public/v2/chart-pane.css:
(.chart .marked): Renamed from .hasBugs.
* public/v2/index.html: Specify chartPointRadius and markedPoints.

git-svn-id: https://svn.webkit.org/repository/webkit/trunk@175262 268f45cc-cd09-0410-ab3c-d52691b4dbfc