Reviewed by Maciej Stachowiak.
        
        Tests for more fix-ups to the WebScriptObject/WebScripting APIs, related to
        <rdar://problem/5140447> API for fetching JSGlobalContextRef from WebView 
        or WebFrame

        * fast/dom/wrapper-classes-expected.txt:
        * fast/dom/wrapper-classes.html: Added cases to test the wrapper classes
        for different data types sent across the JS/ObjC bridge.
        * fast/dom/wrapper-round-tripping-expected.txt: Added.
        * fast/dom/wrapper-round-tripping.html: Added. New test to verify that
        you can round-trip between a JSObjectRef and a WebScriptObject.

WebCore:

        Reviewed by Maciej Stachowiak.
        
        More fix-ups to the WebScriptObject/WebScripting APIs, related to
        <rdar://problem/5140447> API for fetching JSGlobalContextRef from WebView 
        or WebFrame

        * bindings/objc/WebScriptObject.h: Fully specified the surprising rules for
        type conversion between JavaScript and ObjC.
        * bindings/objc/WebScriptObject.mm: Added up-call accessor to WebFrame.
        This is kind of stinky, but I'm OK with it because eventually all of this
        code should move up into WebKit.
        (+[WebScriptObject scriptObjectForJSObject:frame:]):
        (-[WebScriptObject valueForKey:]):
        (-[WebScriptObject JSObject]): 
            - Added _rootObject check because if _rootObject returns NULL it means 
            that _imp is no longer GC protected, so it's not safe to use. 
            - Added _isSafeScript check because that's what WebScriptObject methods
            typically do, even though the value of doing so isn't clear to me.
        * bindings/objc/WebScriptObjectPendingPublic.h: Added WebFrame* parameter
        to -scriptObjectForJSObject:. This is required to wrap JS objects that
        are not already in the wrapper cache. It would be nice to remove this
        limitation of WebScriptObject some day.
        * page/mac/FrameMac.mm:
        (WebCore::Frame::cleanupPlatformScriptObjects): Force removal of m_windowScriptObject
        from the cache, to avoid retrieving the m_windowScriptObject from the previous
        page on a new page load. (It would be non-functional in that case.)

WebKitTools:

        Reviewed by Maciej Stachowiak.
        
        Added support for testing ObjC/JS type bridging.
        
        Added ASSERT that -JSObject returns nil when the underlying JSObject
        is no longer GC protected.

        * DumpRenderTree/DumpRenderTree.m:
        (returnThisCallback):
        (returnThisClass):
        (-[WaitUntilDoneDelegate webView:didClearWindowObject:forFrame:]):
        (+[LayoutTestController isSelectorExcludedFromWebScript:]):
        (+[LayoutTestController webScriptNameForSelector:]):
        (-[LayoutTestController accessStoredWebScriptObject]):
        (-[LayoutTestController testWrapperRoundTripping]):
        (-[LayoutTestController objCClassNameOf:]):
        (-[LayoutTestController objCObjectOfClass:]):
        * DumpRenderTree/DumpRenderTree.xcodeproj/project.pbxproj:



git-svn-id: http://svn.webkit.org/repository/webkit/trunk@21354 268f45cc-cd09-0410-ab3c-d52691b4dbfc