Make the TimelineRecordTreeElement location subtitle live.

https://bugs.webkit.org/show_bug.cgi?id=127270

Reviewed by Joseph Pecoraro.

* Localizations/en.lproj/localizedStrings.js: Updated.

* UserInterface/SourceCodeLocation.js:
(WebInspector.SourceCodeLocation.prototype.originalLocationString):
(WebInspector.SourceCodeLocation.prototype.formattedLocationString):
(WebInspector.SourceCodeLocation.prototype.displayLocationString):
(WebInspector.SourceCodeLocation.prototype.updateDisplayString):
(WebInspector.SourceCodeLocation.prototype._locationString):
Support for a new nameStyle enum and a prefix for the location string.
Passing the prefix here lets it be italicized with the line number.
Support column number for SourceCode's without a URL too.

* UserInterface/TimelineRecordTreeElement.js:
(WebInspector.TimelineRecordTreeElement):
(WebInspector.TimelineRecordTreeElement.prototype.onattach):
Create a subtitle span to update the location inside. Update the tooltip on attach.

git-svn-id: http://svn.webkit.org/repository/webkit/trunk@162421 268f45cc-cd09-0410-ab3c-d52691b4dbfc