Fixed <rdar://problem/3898708> REGRESSION (8A314-8A317): World Clock's short hand...

	Fixed <rdar://problem/3898708> REGRESSION (8A314-8A317): World Clock's short hand not displayed (ImageIO problem with PDF?)
	Fixed <rdar://problem/3914012> use CG directly for pdf images not ImageIO

	Create a PDF document and draw that instead of using ImageIO to create a rasterized image.

        Reviewed by Maciej.

        * WebCoreSupport.subproj/WebImageData.h:
        * WebCoreSupport.subproj/WebImageData.m:
        (-[WebImageData setIsPDF:]):
        (-[WebImageData isPDF]):
        (-[WebImageData dealloc]):
        (-[WebImageData decodeData:isComplete:callback:]):
        (-[WebImageData incrementalLoadWithBytes:length:complete:callback:]):
        (-[WebImageData size]):
        (-[WebImageData animate]):
        (-[WebImageData _createPDFWithData:]):
        (-[WebImageData _PDFDocumentRef]):
        (-[WebImageData _PDFDrawInContext:]):
        (-[WebImageData _PDFDrawFromRect:toRect:operation:alpha:flipped:context:]):
        * WebCoreSupport.subproj/WebImageRenderer.h:
        * WebCoreSupport.subproj/WebImageRenderer.m:
        (-[WebImageRenderer size]):
        (-[WebImageRenderer incrementalLoadWithBytes:length:complete:callback:]):
        (-[WebImageRenderer drawImageInRect:fromRect:compositeOperator:context:]):
        (_createImageRef):

git-svn-id: https://svn.webkit.org/repository/webkit/trunk@8184 268f45cc-cd09-0410-ab3c-d52691b4dbfc