Web Inspector: make 'glue asynchronous events' optional.

Web Inspector: make 'glue asynchronous events' optional.
https://bugs.webkit.org/show_bug.cgi?id=79240

Reviewed by Yury Semikhatsky.

* English.lproj/localizedStrings.js:
* inspector/front-end/Images/statusbarButtonGlyphs.png:
* inspector/front-end/TimelinePanel.js:
(WebInspector.TimelinePanel.prototype.get statusBarItems):
(WebInspector.TimelinePanel.prototype._createStatusbarButtons):
(WebInspector.TimelinePanel.prototype._glueParentButtonClicked):
(WebInspector.TimelinePanel.prototype._toggleStartAtZeroButtonClicked):
(WebInspector.TimelinePanel.prototype._repopulateRecords):
(WebInspector.TimelinePanel.prototype._findParentRecord):
(WebInspector.TimelinePanel.prototype._innerAddRecordToTimeline):
(WebInspector.TimelinePanel.prototype.sidebarResized):
(WebInspector.TimelineCalculator.prototype.computeBarGraphPercentages):
(WebInspector.TimelineCalculator.prototype.computeBarGraphWindowPosition):
(WebInspector.TimelineRecordGraphRow):
(WebInspector.TimelineRecordGraphRow.prototype.update):
(WebInspector.TimelinePanel.FormattedRecord.prototype._calculateAggregatedStats):
* inspector/front-end/timelinePanel.css:
(.glue-async-status-bar-item .glyph):
(.timeline-start-at-zero-status-bar-item .glyph):

git-svn-id: http://svn.webkit.org/repository/webkit/trunk@108507 268f45cc-cd09-0410-ab3c-d52691b4dbfc