Reviewed by Dimitri Glazkov.

        Adds layoutTestController.shadowRoot accessor to Mac DRT.
        https://bugs.webkit.org/show_bug.cgi?id=57415

        Updates the keygen test to exercise new DRT functionality; skips
        on other ports for now.

        * fast/dom/HTMLKeygenElement/keygen-expected.txt:
        * fast/dom/HTMLKeygenElement/keygen.html:
        * platform/chromium/test_expectations.txt:
        * platform/gtk/Skipped:
        * platform/qt/Skipped:
        * platform/win/Skipped:
2011-03-30  Dominic Cooney  <dominicc@google.com>

        Reviewed by Dimitri Glazkov.

        Adds layoutTestController.shadowRoot accessor to Mac DRT.
        https://bugs.webkit.org/show_bug.cgi?id=57415

        * WebCore.exp.in: DRT needs to link WebCore::Element::shadowRoot
2011-03-30  Dominic Cooney  <dominicc@google.com>

        Reviewed by Dimitri Glazkov.

        Adds layoutTestController.shadowRoot accessor to Mac DRT.
        https://bugs.webkit.org/show_bug.cgi?id=57415

        * DOM/WebDOMOperations.mm:
        (-[DOMElement _shadowRoot:]):
        * DOM/WebDOMOperationsPrivate.h:
2011-03-30  Dominic Cooney  <dominicc@google.com>

        Reviewed by Dimitri Glazkov.

        Adds layoutTestController.shadowRoot accessor to Mac DRT.
        https://bugs.webkit.org/show_bug.cgi?id=57415

        * DumpRenderTree/LayoutTestController.cpp:
        (shadowRootCallback):
        (LayoutTestController::staticFunctions):
        * DumpRenderTree/LayoutTestController.h:
        * DumpRenderTree/mac/LayoutTestControllerMac.mm:
        (LayoutTestController::shadowRoot):
        * DumpRenderTree/win/LayoutTestControllerWin.cpp:
        (LayoutTestController::shadowRoot):

git-svn-id: http://svn.webkit.org/repository/webkit/trunk@82536 268f45cc-cd09-0410-ab3c-d52691b4dbfc