Reviewed by Darin Adler.

        Added test to verify that you get back the same JS/ObjC wrapper when
        you access the same object twice.

        * fast/dom/wrapper-identity-expected.txt: Added.
        * fast/dom/wrapper-identity.html: Added.

WebCore:

        Reviewed by Darin Adler.
        
        More fix-ups to the WebScriptObject/WebScripting APIs, related to
        <rdar://problem/5140447> API for fetching JSGlobalContextRef from WebView 
        or WebFrame
        
        1. Added -scriptObjectForJSObject: SPI so you can bridge back from JavaScriptCore
        to WebScriptObject.
        
        2. Fixed WebScriptObject bridging so that you always get the same WebScriptObject
        for a JSObject (like in the DOM). This makes -scriptObjectForJSObject: a
        lot more coherent as an API.

        * bindings/objc/DOMInternal.mm: Renamed wrapperCache to DOMWrapperCache
        to distinguish from the JSWrapperCache. Added typedef for readability.
        (WebCore::getDOMWrapper):
        (WebCore::addDOMWrapper):
        (WebCore::removeDOMWrapper):
        * bindings/objc/WebScriptObject.mm: Added JSWrapperCache, which works just
        like the DOMWrapperCache.
        (WebCore::getJSWrapper):
        (WebCore::addJSWrapper):
        (WebCore::removeJSWrapper):
        (WebCore::createJSWrapper):
        (+[WebScriptObject scriptObjectForJSObject:]): This is the new API. It attempts
        to return a specific DOM wrapper object, or, barring that, it returns a 
        generic WebScriptObject.
        (+[WebScriptObject scriptObjectForJSObject:originRootObject:rootObject:]):
        Added this method to support our old WebScriptObject security and leak 
        checking model, even though it doesn't work very well. 
        (-[WebScriptObject _setImp:originRootObject:rootObject:]):
        (-[WebScriptObject dealloc]):
        (-[WebScriptObject finalize]):
        (+[WebScriptObject _convertValueToObjcValue:originRootObject:rootObject:]):
        * bindings/objc/WebScriptObjectPendingPublic.h:
        * bindings/objc/WebScriptObjectPrivate.h:
        * page/mac/FrameMac.mm:
        (WebCore::Frame::windowScriptObject): Changed to use the new API. This
        fixes a bug where the object sent to -windowScriptObjectAvailable: and returned
        from -windowScriptObject could not be round-tripped.

WebKitTools:

        Reviewed by Darin Adler.
        
        Added support for testing ObjC object identity.
        
        Added ASSERT to verify that you can round-trip the object passed to you
        in -didClearWindowObject:forFrame:.

        * DumpRenderTree/DumpRenderTree.m:
        (-[WaitUntilDoneDelegate webView:didClearWindowObject:forFrame:]):
        (+[LayoutTestController isSelectorExcludedFromWebScript:]):
        (+[LayoutTestController webScriptNameForSelector:]):
        (-[LayoutTestController accessStoredWebScriptObject]):
        (-[LayoutTestController objCIdentityIsEqual::]):



git-svn-id: http://svn.webkit.org/repository/webkit/trunk@21324 268f45cc-cd09-0410-ab3c-d52691b4dbfc