Reviewed and tweaked by Darin.

    Reviewed and tweaked by Darin.

        - added DumpRenderTree support so editing delegate can be made to refuse edits
          to enable tests for http://bugzilla.opendarwin.org/show_bug.cgi?id=10129

        * DumpRenderTree/DumpRenderTree.m:
        (+[LayoutTestController isSelectorExcludedFromWebScript:]): Add setAcceptsEditing:
        to the list of methods.
        (+[LayoutTestController webScriptNameForSelector:]): Use the name setAcceptsEditing,
        without the colon, for the JavaScript name.
        (-[LayoutTestController setAcceptsEditing:]): Added. Calls through to the editing
        delegate.
        (dumpRenderTree): Set the acceptsEditing flag to YES before each test.

        * DumpRenderTree/EditingDelegate.h: Added an "acceptsEditing" flag and getter and
        setter methods to the class.
        * DumpRenderTree/EditingDelegate.m:
        (-[EditingDelegate init]): Initialize acceptsEditing to YES.
        (-[EditingDelegate webView:shouldBeginEditingInDOMRange:]): Instead of always returning YES,
        return the value of acceptsEditing.
        (-[EditingDelegate webView:shouldEndEditingInDOMRange:]): Ditto.
        (-[EditingDelegate webView:shouldInsertNode:replacingDOMRange:givenAction:]): Ditto.
        (-[EditingDelegate webView:shouldInsertText:replacingDOMRange:givenAction:]): Ditto.
        (-[EditingDelegate webView:shouldDeleteDOMRange:]): Ditto.
        (-[EditingDelegate webView:shouldChangeSelectedDOMRange:toDOMRange:affinity:stillSelecting:]):
        Ditto.
        (-[EditingDelegate webView:shouldApplyStyle:toElementsInDOMRange:]): Ditto.
        (-[EditingDelegate webView:shouldChangeTypingStyle:toStyle:]): Ditto.
        (-[EditingDelegate setAcceptsEditing:]): Added.

git-svn-id: https://svn.webkit.org/repository/webkit/trunk@15904 268f45cc-cd09-0410-ab3c-d52691b4dbfc