Web Inspector: highlight DOM nodes on hover while debugging

Web Inspector: highlight DOM nodes on hover while debugging
https://bugs.webkit.org/show_bug.cgi?id=109355

Reviewed by Vsevolod Vlasov.

Along with showing the popover, highlight the remote object as node.

* inspector/front-end/ObjectPopoverHelper.js:
(WebInspector.ObjectPopoverHelper.prototype.):
(WebInspector.ObjectPopoverHelper.prototype._showObjectPopover):
(WebInspector.ObjectPopoverHelper.prototype._onHideObjectPopover):

git-svn-id: https://svn.webkit.org/repository/webkit/trunk@142450 268f45cc-cd09-0410-ab3c-d52691b4dbfc