Reviewed by Hyatt.

        Fix for <rdar://problem/5399614> anchor tag is not rendered without 
        text content, works in Firefox with CSS background-image (13237)

        This patch allows empty inlines that have box decorations or width 
        from border/padding/margin to have line boxes.

        * rendering/bidi.cpp:
        (WebCore::inlineFlowAllowsLineBox): Convenience function that 
        defines when we allow an inline flow to have a line box.
        (WebCore::requiresLineBox): Call inlineFlowAllowsLineBox.
        (WebCore::shouldSkipWhitespaceAfterStartObject): New function to 
        merge some shared code between list markers and empty inline flows 
        that fall at the beginning of a line.
        (WebCore::RenderBlock::findNextLineBreak): Make flows more like 
        list markers.

        One interesting side effect of this bug appeared in our xhtml/svg 
        tests that generate parser error tags. The tag we generate was 
        actually an empty inline with box decorations. This patch causes 
        those inlines to draw now, and the parser errors looked strange. So 
        I changed it so that the parsererror tag is display:block. This 
        matches Firefox, and I think was the original intent of the tag 
        since that causes its red background and border to show up.
        * dom/XMLTokenizer.cpp:
        (WebCore::createXHTMLParserErrorHeader):

LayoutTests:

        Reviewed by Hyatt.

        New tests and new results for old tests for <rdar://problem/
        5399614> anchor tag is not rendered without text content, works in 
        Firefox with CSS background-image (13237)

        New tests:
        * fast/inline/drawStyledEmptyInlines.html: Added.
        * fast/inline/drawStyledEmptyInlinesWithWS.html: Added.
        * fast/inline/emptyInlinesWithinLists.html: Added.
        * fast/inline/styledEmptyInlinesWithBRs.html: Added.
        * platform/mac/fast/inline/drawStyledEmptyInlines-expected.checksum: Added.
        * platform/mac/fast/inline/drawStyledEmptyInlines-expected.png: Added.
        * platform/mac/fast/inline/drawStyledEmptyInlines-expected.txt: Added.
        * platform/mac/fast/inline/drawStyledEmptyInlinesWithWS-expected.checksum: Added.
        * platform/mac/fast/inline/drawStyledEmptyInlinesWithWS-expected.png: Added.
        * platform/mac/fast/inline/drawStyledEmptyInlinesWithWS-expected.txt: Added.
        * platform/mac/fast/inline/emptyInlinesWithinLists-expected.checksum: Added.
        * platform/mac/fast/inline/emptyInlinesWithinLists-expected.png: Added.
        * platform/mac/fast/inline/emptyInlinesWithinLists-expected.txt: Added.
        * platform/mac/fast/inline/styledEmptyInlinesWithBRs-expected.checksum: Added.
        * platform/mac/fast/inline/styledEmptyInlinesWithBRs-expected.png: Added.
        * platform/mac/fast/inline/styledEmptyInlinesWithBRs-expected.txt: Added.
        
        New results for tests with <paserererrors> since <parsererror> is 
        now block.
        * platform/mac/fast/invalid/junk-data-expected.checksum: Replaced.
        * platform/mac/fast/invalid/junk-data-expected.png: Replaced.
        * platform/mac/fast/invalid/junk-data-expected.txt:
        * platform/mac/fast/invalid/missing-end-tag-expected.checksum: Replaced.
        * platform/mac/fast/invalid/missing-end-tag-expected.png: Replaced.
        * platform/mac/fast/invalid/missing-end-tag-expected.txt:
        * platform/mac/fast/parser/xhtml-alternate-entities-expected.checksum: Replaced.
        * platform/mac/fast/parser/xhtml-alternate-entities-expected.png: Replaced.
        * platform/mac/fast/parser/xhtml-alternate-entities-expected.txt:
        * platform/mac/fast/xsl/xslt-extra-content-at-end-expected.checksum: Replaced.
        * platform/mac/fast/xsl/xslt-extra-content-at-end-expected.png: Replaced.
        * platform/mac/fast/xsl/xslt-extra-content-at-end-expected.txt: Removed.
        * platform/mac/svg/custom/junk-data-expected.checksum: Replaced.
        * platform/mac/svg/custom/junk-data-expected.png: Replaced.
        * platform/mac/svg/custom/junk-data-expected.txt:
        * platform/mac/svg/custom/missing-xlink-expected.checksum: Replaced.
        * platform/mac/svg/custom/missing-xlink-expected.png: Replaced.
        * platform/mac/svg/custom/missing-xlink-expected.txt:
        * platform/mac/svg/hixie/error/012-expected.checksum: Replaced.
        * platform/mac/svg/hixie/error/012-expected.png: Replaced.
        * platform/mac/svg/hixie/error/012-expected.txt:



git-svn-id: http://svn.webkit.org/repository/webkit/trunk@27254 268f45cc-cd09-0410-ab3c-d52691b4dbfc