Reviewed by Eric Seidel.

        [Haiku] Modifying WebCore/platform/graphics files to allow Haiku port.
        https://bugs.webkit.org/show_bug.cgi?id=28128

        * platform/graphics/BitmapImage.h: Adding getBBitmap() function.
        * platform/graphics/Color.h: rgb_color is the Color struct in Haiku.
        * platform/graphics/FloatPoint.h: BPoint is the Point class in Haiku.
        * platform/graphics/FloatRect.h: BRect is the Rect class in Haiku.
        * platform/graphics/GraphicsContext.cpp:
        * platform/graphics/GraphicsContext.h: BView is the PlatformGraphicsContext
        class for Haiku. Adding getHaikuStrokeStyle() function.
        * platform/graphics/Icon.h: Adding an empty Icon() constructor because
        this class isn't implemented for the moment.
        * platform/graphics/ImageSource.h: BBitmap is the native bitmap class
        for Haiku.
        * platform/graphics/IntPoint.h: BPoint is the Point class in Haiku.
        * platform/graphics/IntRect.h: BRect is the Rect class in Haiku.
        * platform/graphics/IntSize.h: BSize is the Size class in Haiku.
        * platform/graphics/Path.h: BRegion is the Path class in Haiku.
        * platform/graphics/Pattern.h: Adding the GraphicsDef.h header and the
        native pattern type.
        * platform/graphics/SimpleFontData.h: Adding Haiku's Font.h header.

git-svn-id: http://svn.webkit.org/repository/webkit/trunk@47146 268f45cc-cd09-0410-ab3c-d52691b4dbfc