Bug 831529 - Stop using SkPath::contains for now since it doesn't match the canvas spec. r=jrmuizel
Bug 836892 - Add new blending modes to SkXfermode. r=gw280
Bug 836892 - Add new skia blending modes to GfxOpToSkiaOp. r=gw280
Bug 831525: Enable Skia canvas rendering on windows xp. r=mattwoodrow