Reviewed by Dan Bernstein.

        Assertion failure: !repaintContainer || repaintContainer == this
        https://bugs.webkit.org/show_bug.cgi?id=36672

        RenderText's implementation of clippedOverflowRectForRepaint() uses containingBlock()
        to get the renderer to use for computing the repaint rect. However, the renderer returned
        by containingBlock() may be an ancestor of the repaintContainer, and containingBlock()
        doesn't have the 'repaintContainerSkipped' logic that container() has.

        So in this case, check to see whether repaintContainer is actually a descendant of the
        containing block, and in that case just repaint the entire repaintContainer.

        Test: compositing/repaint/inline-repaint-container.html

        * rendering/RenderText.cpp:
        (WebCore::RenderText::clippedOverflowRectForRepaint):

git-svn-id: http://svn.webkit.org/repository/webkit/trunk@56924 268f45cc-cd09-0410-ab3c-d52691b4dbfc