Web Inspector: Flame Chart. Scroll dividers together with underlying chart.
http://bugs.webkit.org/show_bug.cgi?id=113080

Reviewed by Pavel Feldman.

* inspector/front-end/FlameChart.js:
(WebInspector.FlameChart.Calculator.prototype.grandMinimumBoundary):
(WebInspector.FlameChart.prototype._canvasDragging):
* inspector/front-end/TimelineGrid.js:
(WebInspector.TimelineGrid.prototype.updateDividers):

git-svn-id: http://svn.webkit.org/repository/webkit/trunk@146890 268f45cc-cd09-0410-ab3c-d52691b4dbfc