Add the recording button back to the Timelines sidebar.

https://bugs.webkit.org/show_bug.cgi?id=127314

Reviewed by Joseph Pecoraro.

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

* UserInterface/TimelineContentView.js:
(WebInspector.TimelineContentView.prototype.get navigationItems):
(WebInspector.TimelineContentView.prototype._update):
(WebInspector.TimelineContentView.prototype._updateTimes):
(WebInspector.TimelineContentView.prototype._startUpdatingCurrentTime):
(WebInspector.TimelineContentView.prototype._recordingTimesUpdated):
(WebInspector.TimelineContentView.prototype._clearTimeline):
(WebInspector.TimelineContentView.prototype._recordingReset):
Add a clear button and reset the time ruler and views when the recording resets.

* UserInterface/TimelineSidebarPanel.css:
(.sidebar > .panel.timeline > .status-bar):
(.sidebar > .panel.timeline > .status-bar > .record-glyph):
(.sidebar > .panel.timeline > .status-bar > .record-glyph.recording):
(.sidebar > .panel.timeline > .status-bar > .record-glyph:hover):
(.sidebar > .panel.timeline > .status-bar > .record-glyph.recording:hover):
(.sidebar > .panel.timeline > .status-bar > .record-glyph.forced):
(.sidebar > .panel.timeline > .status-bar > .record-glyph.recording.forced):
(.sidebar > .panel.timeline > .status-bar > .record-status):
Add styles for the recording button and status message.

* UserInterface/TimelineSidebarPanel.js:
(WebInspector.TimelineSidebarPanel.prototype._contentBrowserCurrentContentViewDidChange):
(WebInspector.TimelineSidebarPanel.prototype._recordingStarted):
(WebInspector.TimelineSidebarPanel.prototype._recordingStopped):
(WebInspector.TimelineSidebarPanel.prototype._recordGlyphMousedOver):
(WebInspector.TimelineSidebarPanel.prototype._recordGlyphMousedOut):
(WebInspector.TimelineSidebarPanel.prototype._recordGlyphClicked):
Add support for the recording button and status message.

git-svn-id: http://svn.webkit.org/repository/webkit/trunk@162422 268f45cc-cd09-0410-ab3c-d52691b4dbfc