Reviewed by Simon Fraser.

        Embedded Vimeo video, when taken fullscreen, is overlapped by content from the enclosing page
        https://bugs.webkit.org/show_bug.cgi?id=61712

        * fullscreen/full-screen-iframe-zIndex-expected.txt: Added.
        * fullscreen/full-screen-iframe-zIndex.html: Added.
        * platform/mac/fullscreen/full-screen-iframe-zIndex-expected.png: Added.
2011-05-29  Jer Noble  <jer.noble@apple.com>

        Reviewed by Simon Fraser.

        Embedded Vimeo video, when taken fullscreen, is overlapped by content from the enclosing page
        https://bugs.webkit.org/show_bug.cgi?id=61712

        Tests: fullscreen/full-screen-iframe-zIndex.html

        Walk up the ancestor chain for the full-screen element, marking them as full-screen
        ancestors. Then, we apply a pseudo-class to those elements, which disable all their
        stacking-context-creating styles.  Set the z-index of all full-screen elements (and
        the iframes which contain them) to a large value, ensuring they appear above other
        sibling elements.

        This new behavior replaces the previous "-webkit-full-screen-media-document" behavior
        and pesudo-class, so remove it and replace it with the new pseudo-class.

        * css/CSSSelector.cpp:
        (WebCore::nameToPseudoTypeMap): Add -webkit-full-screen-ancestor and remove
            -webkit-full-screen-media-document.
        (WebCore::CSSSelector::pseudoId): Add PseudoFullScreenAncestor and remove
            PseudoFullScreenMediaDocument
        (WebCore::CSSSelector::extractPseudoType): Ditto.
        * css/CSSSelector.h: Ditto.
        * css/CSSStyleSelector.cpp:
        (WebCore::CSSStyleSelector::SelectorChecker::checkOneSelector): Remove the
            PseudoFullScreenMediaDocument implementation and replace it with
            PseudoFullScreenAncestor.
        * css/fullscreen.css:
        (:-webkit-full-screen): Add a z-index property.
        (:-webkit-full-screen-ancestor:not(iframe)): Added.  Reset the z-index to
            auto, and reset other stacking-context creating properties.
        * dom/Document.cpp:
        (WebCore::Document::setContainsFullScreenElementRecursively): Recurse up every element
            instead of just the iframe elements.
        (WebCore::Document::webkitWillEnterFullScreenForElement): Ditto.
        * dom/Element.cpp:
        (WebCore::Element::willRemove): Reset our parent's containsFullScreenElement property.
        (WebCore::Element::insertedIntoTree): Ditto.
        (WebCore::Element::containsFullScreenElement): Moved here from HTMLElementBase.
        (WebCore::Element::setContainsFullScreenElement): Ditto.
        * dom/Element.h:
        * dom/ElementRareData.h:
        (WebCore::ElementRareData::ElementRareData): Added ivar and initializer for
            m_containsFullScreenElement.
        * html/HTMLFrameElementBase.cpp:
        (WebCore::HTMLFrameElementBase::HTMLFrameElementBase): Removed ivar and initializer.
        (WebCore::HTMLFrameElementBase::setContainsFullScreenElement): Moved into Element.
        * html/HTMLFrameElementBase.h:
        * rendering/style/RenderStyleConstants.h:

git-svn-id: http://svn.webkit.org/repository/webkit/trunk@87660 268f45cc-cd09-0410-ab3c-d52691b4dbfc