Web Inspector: Paint Flashing button does not match page state after reload
https://bugs.webkit.org/show_bug.cgi?id=137680

Patch by Joseph Pecoraro <pecoraro@apple.com> on 2014-10-13
Reviewed by Timothy Hatcher.

* UserInterface/Base/Main.js:
(WebInspector.loaded):
Make paint flashing a frontend setting. Enable it when the inspector
is opened if it was previously enabled.

* UserInterface/Views/DOMTreeContentView.js:
(WebInspector.DOMTreeContentView):
(WebInspector.DOMTreeContentView.prototype._togglePaintFlashing):
(WebInspector.DOMTreeContentView.prototype._showPaintRectsSettingChanged):
Have the paint flashing button always match the global setting.

git-svn-id: http://svn.webkit.org/repository/webkit/trunk@174670 268f45cc-cd09-0410-ab3c-d52691b4dbfc