[Mac] lang, xml:lang, content-language ignored when choosing fonts

    [Mac] lang, xml:lang, content-language ignored when choosing fonts
        https://bugs.webkit.org/show_bug.cgi?id=10874
        <rdar://problem/3220202>

        Reviewed by Dan Bernstein.

        Adding a default font table for Mac port. Clients can still override these if they want to,
        but knowing which fonts to use is more about the platform than about the client.

        Tests: platform/mac/fonts/han-disunification.html

        * DerivedSources.make:
        * WebCore.xcodeproj/project.pbxproj:
        * Resources/DefaultFonts.plist.in: Added.
        Added SettingsMac.mm. Added preprocessed property list with default fonts.

        * page/Settings.cpp:
        (WebCore::setGenericFontFamilyMap): Don't notify the page if we don't have one yet.
        (WebCore::Settings::Settings): Assign to m_page after calling initializeDefaultFontFamilies,
        so that we won't try to call page->setNeedsRecalcStyleInAllFrames() in a half-initialized
        Page that's creating settings.
        (WebCore::Settings::initializeDefaultFontFamilies): Dummy imlplementation for ports that
        rely on client to set defaults.

        * page/Settings.h: Added initializeDefaultFontFamilies().

        * page/mac/SettingsMac.mm: Added.
        (WebCore::defaultFontFamilyDictionary):
        (WebCore::Settings::initializeDefaultFontFamilies):
        Load defaults from a plist file inside WebCore framework.

git-svn-id: http://svn.webkit.org/repository/webkit/trunk@113900 268f45cc-cd09-0410-ab3c-d52691b4dbfc