[Chromium]: Plane 2 characters are rendered "blank"
         (not even empty boxes) on Windows even when there are fonts to
         cover them.

        https://bugs.webkit.org/show_bug.cgi?id=35605

        Test:LayoutTests/fast/text/international/plane2.html

        * platform/graphics/chromium/FontCacheChromiumWin.cpp:
        (WebCore::LookupAltName): Add two ExtB fonts to the array (namePairs) that are used for Plane 2 character rendering.
        (WebCore::FontCache::getFontDataForCharacters): Add two more fonts to the fallback font list
        * platform/graphics/chromium/FontUtilsChromiumWin.cpp:
        (WebCore::getFallbackFamily): Fix the fallback font lookup to cover Plane 2 (CJK ExtB).

git-svn-id: http://svn.webkit.org/repository/webkit/trunk@55870 268f45cc-cd09-0410-ab3c-d52691b4dbfc