Reviewed by Darin.

        Test for: <rdar://problem/4928583> Memory usage grows when reloading google.com/ig

        * fast/dom/gc-10-expected.txt: Added.
        * fast/dom/gc-10.html: Added.
        * fast/dom/resources/gc-10-frame.html: Added.

WebCore:

        Reviewed by Darin.

        Fix for: <rdar://problem/4928583> Memory usage grows when reloading google.com/ig

        JSDocuments are now responsible for marking the DOM wrappers associated with them, when they get marked.
        This fixes a JS object leak when a DOM wrapper has a reference to a JSDocument that is otherwise not reachable.

        Test: fast/dom/gc-10.html

        * WebCore.vcproj/WebCore/WebCore.vcproj:
        * WebCore.xcodeproj/project.pbxproj:
        * bindings/js/JSDocumentCustom.cpp: Added.
        (WebCore::JSDocument::mark):
        * bindings/js/kjs_binding.cpp:
        (KJS::ScriptInterpreter::markDOMNodesForDocument):
        (KJS::ScriptInterpreter::mark):
        * bindings/js/kjs_binding.h:
        * dom/Document.idl:

WebKitTools:

        Reviewed by Darin.

        Test support for: <rdar://problem/4928583> Memory usage grows when reloading google.com/ig

        This adds a getJSObjectCount test-accessible function to allow test scripts to track JSObject usage.

        * DumpRenderTree/GCController.h:
        * DumpRenderTree/GCController.mm:
        (+[GCController isSelectorExcludedFromWebScript:]):
        (-[GCController getJSObjectCount]):



git-svn-id: http://svn.webkit.org/repository/webkit/trunk@19013 268f45cc-cd09-0410-ab3c-d52691b4dbfc