https://bugs.webkit.org/show_bug.cgi?id=49762
        Stylesheet wrappers are not GC protected

        Tests: fast/dom/StyleSheet/gc-inline-style-cssvalues.html
               fast/dom/StyleSheet/gc-styleheet-wrapper.xhtml

        * Android.jscbindings.mk:
        * CMakeLists.txt:
        * GNUmakefile.am:
        * WebCore.gypi:
        * WebCore.pro:
        * WebCore.vcproj/WebCore.vcproj:
        Added the new custom bindings files.

        * WebCore.xcodeproj/project.pbxproj: Added the new custom bindings files. Also, added some
        existing headers.

        * bindings/js/JSDOMBinding.cpp: (WebCore::isObservableThroughDOM): If a node has a stylesheet
        with a wrapper, it may be the only thing having the stylesheet's wrapper alive, so its own
        wrapper has to stay alive, too.
        While at it, also fixed the same issue with inline style declarations.
        Also, added a FIXME comment about one with attribute nodes. We implement a less conservative
        approach for nodes, so perhaps fixing this is not as easy as removing a hasCustomProperties()
        check.

        * bindings/js/JSHTMLLinkElementCustom.cpp: Added.
        (WebCore::JSHTMLLinkElement::markChildren):
        * bindings/js/JSHTMLStyleElementCustom.cpp: Added.
        (WebCore::JSHTMLStyleElement::markChildren):
        * bindings/js/JSProcessingInstructionCustom.cpp: Added.
        (WebCore::JSProcessingInstruction::markChildren):
        Mark stylesheets owned by these nodes. As always in markChildren() functions, we do it
        conservatively, without checking whether the stylesheet or any of its children have custom
        properties.

        * dom/ProcessingInstruction.idl:
        * html/HTMLLinkElement.idl:
        * html/HTMLStyleElement.idl:
        These have custom mark functions now.



git-svn-id: http://svn.webkit.org/repository/webkit/trunk@72344 268f45cc-cd09-0410-ab3c-d52691b4dbfc