Reviewed by Dave Hyatt and Mark Rowe.

        http://bugs.webkit.org/show_bug.cgi?id=16089
        [GTK] Support custom fonts, CachedFont::platformDataFromCustomData()

        Add support for CSS2 @font-face custom/downloadable fonts to the GTK+
        port.

        * GNUmakefile.am:
        * WebCore.pro:
        * loader/CachedFont.cpp:
        (WebCore::CachedFont::~CachedFont):
        (WebCore::CachedFont::ensureCustomFontData):
        (WebCore::CachedFont::platformDataFromCustomData):
        (WebCore::CachedFont::allReferencesRemoved):
        * platform/graphics/gtk/FontCustomPlatformData.cpp: Added.
        (WebCore::FontCustomPlatformData::~FontCustomPlatformData):
        (WebCore::FontCustomPlatformData::fontPlatformData):
        (WebCore::releaseData):
        (WebCore::createFontCustomPlatformData):
        * platform/graphics/gtk/FontCustomPlatformData.h: Added.
        (WebCore::FontCustomPlatformData::FontCustomPlatformData):
        * platform/graphics/gtk/FontPlatformData.h:
        * platform/graphics/gtk/FontPlatformDataGtk.cpp:
        (WebCore::FontPlatformData::FontPlatformData):
        (WebCore::FontPlatformData::init):
        (WebCore::FontPlatformData::isFixedPitch):
        * platform/graphics/gtk/SimpleFontDataGtk.cpp:
        (WebCore::SimpleFontData::platformDestroy):


git-svn-id: http://svn.webkit.org/repository/webkit/trunk@29418 268f45cc-cd09-0410-ab3c-d52691b4dbfc