The comment in ColorMac.mm about NSColor things not throwing exceptions is a lie. <rdar://problem/13904395>
Created attachment 201904 [details] patch
Comment on attachment 201904 [details] patch View in context: https://bugs.webkit.org/attachment.cgi?id=201904&action=review > Source/WebCore/platform/graphics/mac/ColorMac.mm:63 > + return makeRGBA(0, 0, 0, 0); Not sure what a reasonable fallback color is.
Comment on attachment 201904 [details] patch View in context: https://bugs.webkit.org/attachment.cgi?id=201904&action=review > Source/WebCore/platform/graphics/mac/ColorMac.mm:61 > + Maybe remove this blank line.
http://trac.webkit.org/changeset/150167