Web Inspector: Timeline. Scroll dividers with the underlying events.
https://bugs.webkit.org/show_bug.cgi?id=113315

Reviewed by Pavel Feldman.

Now when TimelineGrid is able to draw dividers with any offset
we could cut away paddingLeft member of Timeline.Calculator
and clear the code of TimelineGrid.

* inspector/front-end/TimelineGrid.js:
(WebInspector.TimelineGrid.prototype.updateDividers):
* inspector/front-end/TimelinePanel.js:
(WebInspector.TimelinePanel.prototype._refresh):
(WebInspector.TimelineCalculator.prototype.computePosition):
(WebInspector.TimelineCalculator.prototype.setDisplayWindow):
(WebInspector.TimelineCalculator.prototype.grandMinimumBoundary):
* inspector/front-end/inspectorCommon.css:
(.resources-dividers-label-bar):

git-svn-id: http://svn.webkit.org/repository/webkit/trunk@146969 268f45cc-cd09-0410-ab3c-d52691b4dbfc