301af9a

Include Element attributes in render tree output
https://bugs.webkit.org/show_bug.cgi?id=295248
rdar://154712771

Reviewed by NOBODY (OOPS!).

When using `showRenderTree()` it's helpful to see element classnames and
ids to match renderers to elements.

Add `Element::Element::attributesForDescription()`, and call it from
`RenderObject::outputRenderObject()`.

* Source/WebCore/dom/Element.cpp:
(WebCore::Element::attributesForDescription const):
* Source/WebCore/dom/Element.h:
* Source/WebCore/rendering/RenderLayer.cpp:
(WebCore::outputIndent): Typo fix
(WebCore::outputPaintOrderTreeRecursive):
(WebCore::outputLayerPositionTreeRecursive):
(WebCore::outputIdent): Deleted.
* Source/WebCore/rendering/RenderObject.cpp:
(WebCore::RenderObject::outputRenderObject const):

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