v3 UI should show and link the build number on charts page

v3 UI should show and link the build number on charts page
https://bugs.webkit.org/show_bug.cgi?id=152359

Reviewed by Chris Dumez.

Show the hyperlinked build number in the v3 UI.

* public/v3/models/builder.js:
(Builder): Renamed _buildURL to _buildUrlTemplate.
(Builder.prototype.urlForBuild): Added.
* public/v3/pages/chart-pane-status-view.js:
(ChartPaneStatusView):
(ChartPaneStatusView.prototype.render): Added the code to render hyperlinked build number when one is available.
(ChartPaneStatusView.prototype.computeChartStatusLabels): Store currentPoint's measurement object as _buildInfo
if the current point is set by an indicator (not by a selection).

git-svn-id: http://svn.webkit.org/repository/webkit/trunk@194188 268f45cc-cd09-0410-ab3c-d52691b4dbfc