Reviewed by Andreas Kling.

        [Qt] Dragging and dropping an image in edit mode does not work
        https://bugs.webkit.org/show_bug.cgi?id=19385

        When adding an image to the clipboard, we should also include the HTML code of that image so
        it can be used for internal drag and drop.

        This HTML is expected by all clients of drop events so a fragment can be moved from one browser to
        another, or inside the same browser.

        * platform/qt/ClipboardQt.cpp:
        (WebCore::ClipboardQt::declareAndWriteDragImage):

git-svn-id: http://svn.webkit.org/repository/webkit/trunk@83338 268f45cc-cd09-0410-ab3c-d52691b4dbfc