Perf dashboard should extend baseline and target to the future

Perf dashboard should extend baseline and target to the future
https://bugs.webkit.org/show_bug.cgi?id=151511

Reviewed by Darin Adler.

* public/v2/data.js:
(RunsData.prototype.timeSeriesByCommitTime): Added extendToFuture as an argument.
(RunsData.prototype.timeSeriesByBuildTime): Ditto.
(RunsData.prototype._timeSeriesByTimeInternal): Ditto.
(TimeSeries): Add a new point to the end if extendToFuture is set and the series is not empty.
* public/v2/manifest.js:
(App.Manifest._formatFetchedData): Set extendToFuture to true for baselines and targets.

git-svn-id: http://svn.webkit.org/repository/webkit/trunk@192818 268f45cc-cd09-0410-ab3c-d52691b4dbfc