https://bugs.webkit.org/show_bug.cgi?id=124363

Reviewed by Timothy Hatcher.

Add a new WebInspector.HoverMenu class to display an overlay menu that is presented
with respect to a target frame that it draws itself around adding a customizable
action button to its right. The menu uses fade animations as it's presented and
dismissed and a single delegation method is fired when the button is pressed. Finally,
just like a popover, it automatically dismisses itself upon scrolling anywhere
outside of its bounds.

* UserInterface/HoverMenu.css: Added.
* UserInterface/HoverMenu.js: Added.
(WebInspector.HoverMenu):
(WebInspector.HoverMenu.prototype.get element):
(WebInspector.HoverMenu.prototype.dismiss):
(WebInspector.HoverMenu.prototype.handleEvent):
(WebInspector.HoverMenu.prototype._handleClickEvent):
* UserInterface/Images/HoverMenuButton.png: Added.
* UserInterface/Images/HoverMenuButton@2x.png: Added.
* UserInterface/Main.html:

git-svn-id: http://svn.webkit.org/repository/webkit/trunk@160134 268f45cc-cd09-0410-ab3c-d52691b4dbfc