Beginning of the RenderTheme re-architecture (to share more code).  Add the new Theme API header
        file.  Add new USE(NEW_THEME) switch that is enabled on Mac.  The Mac theme will be converted first.

        Reviewed by Tim Hatcher

        * WebCore.vcproj/WebCore.vcproj:
        * WebCore.xcodeproj/project.pbxproj:
        * config.h:
        * platform/Theme.h: Added.
        (WebCore::Theme::Theme):
        (WebCore::Theme::~Theme):
        (WebCore::Theme::baselinePositionAdjustment):
        (WebCore::Theme::controlHasInactiveAppearance):
        (WebCore::Theme::controlsCanHaveInactiveAppearance):
        (WebCore::Theme::controlsCanHaveHoveredAppearance):
        (WebCore::Theme::controlDrawsBorder):
        (WebCore::Theme::controlDrawsBackground):
        (WebCore::Theme::controlDrawsFocusOutline):
        (WebCore::Theme::selectionColor):
        (WebCore::Theme::textSearchHighlightColor):
        (WebCore::Theme::systemColor):
        (WebCore::Theme::systemFont):
        (WebCore::Theme::caretBlinkFrequency):
        (WebCore::Theme::themeChanged):
        (WebCore::Theme::controlSize):
        (WebCore::Theme::controlFont):
        (WebCore::Theme::controlPadding):
        (WebCore::Theme::controlInternalPadding):
        (WebCore::Theme::controlBorder):
        (WebCore::Theme::controlBorderRadius):
        (WebCore::Theme::paint):
        (WebCore::Theme::inflateControlPaintRect):
        * platform/ThemeTypes.h: Added.
        (WebCore::):
        (WebCore::ControlBox::ControlBox):
        (WebCore::ControlBox::top):
        (WebCore::ControlBox::right):
        (WebCore::ControlBox::bottom):
        (WebCore::ControlBox::left):
        * platform/mac/ThemeMac.h: Added.
        (WebCore::ThemeMac::ThemeMac):
        (WebCore::ThemeMac::~ThemeMac):
        * platform/mac/ThemeMac.mm: Added.
        (WebCore::platformTheme):
        * rendering/RenderTheme.cpp:
        (WebCore::RenderTheme::RenderTheme):
        * rendering/RenderTheme.h:



git-svn-id: http://svn.webkit.org/repository/webkit/trunk@37662 268f45cc-cd09-0410-ab3c-d52691b4dbfc