Reviewed by Dave Hyatt.

        - fix http://bugs.webkit.org/show_bug.cgi?id=15259
          <rdar://problem/5499902> REGRESSION: Text overflows when using word spacing and centering (affects myspace.com music videos page)

        Test: fast/text/word-space.html

        * rendering/RenderBlock.cpp:
        (WebCore::stripTrailingSpace): Added word-spacing to the width of the
        space being stripped out.
        * rendering/RenderText.cpp:
        (WebCore::RenderText::trimmedPrefWidths): Changed handling of
        leading space. Since Font::width includes leading space width but not
        leading word spacing, this method needs to either remove the width of a
        space character or add word spacing,
        depending on stripFrontSpaces. 
        (WebCore::RenderText::calcPrefWidths): Corrected the check for adding
        trailing word spacing so that it would work in the case where the last
        space is ignored.
        * rendering/bidi.cpp:
        (WebCore::RenderBlock::computeHorizontalPositionsForLine): Changed to
        actually add word spacing to the total width.

LayoutTests:

        Reviewed by Dave Hyatt.

        - test for http://bugs.webkit.org/show_bug.cgi?id=15259
          <rdar://problem/5499902> REGRESSION: Text overflows when using word spacing and centering (affects myspace.com music videos page)

        * fast/text/word-space.html: Added.
        * platform/mac/fast/css/word-space-extra-expected.txt: Updated result.
        * platform/mac/fast/text/word-space-expected.checksum: Added.
        * platform/mac/fast/text/word-space-expected.png: Added.
        * platform/mac/fast/text/word-space-expected.txt: Added.



git-svn-id: http://svn.webkit.org/repository/webkit/trunk@26846 268f45cc-cd09-0410-ab3c-d52691b4dbfc