Add test for typeface style round trip.

src/ports/SkFontMgr_fontconfig.cpp

Index: src/ports/SkFontMgr_fontconfig.cpp
diff --git a/src/ports/SkFontMgr_fontconfig.cpp b/src/ports/SkFontMgr_fontconfig.cpp
index 0876fb632599adeffb5966b6910555a13f114fab..d4d873744fcec74a87c539dcc30a31cad36d2af4 100644
--- a/src/ports/SkFontMgr_fontconfig.cpp
+++ b/src/ports/SkFontMgr_fontconfig.cpp
@@ -326,7 +326,7 @@ static SkFontStyle skfontstyle_from_fcpattern(FcPattern* pattern) {
         { SkTFixed<FC_WEIGHT_BOLD>::value,       SkTFixed<SkFS::kBold_Weight>::value },
         { SkTFixed<FC_WEIGHT_EXTRABOLD>::value,  SkTFixed<SkFS::kExtraBold_Weight>::value },
         { SkTFixed<FC_WEIGHT_BLACK>::value,      SkTFixed<SkFS::kBlack_Weight>::value },
-        { SkTFixed<FC_WEIGHT_EXTRABLACK>::value, SkTFixed<1000>::value },
+        { SkTFixed<FC_WEIGHT_EXTRABLACK>::value, SkTFixed<SkFS::kExtraBlack_Weight>::value },
     };
     int weight = map_ranges(get_int(pattern, FC_WEIGHT, FC_WEIGHT_REGULAR),
                             weightRanges, SK_ARRAY_COUNT(weightRanges));
@@ -371,7 +371,7 @@ static void fcpattern_from_skfontstyle(SkFontStyle style, FcPattern* pattern) {
         { SkTFixed<SkFS::kBold_Weight>::value,       SkTFixed<FC_WEIGHT_BOLD>::value },
         { SkTFixed<SkFS::kExtraBold_Weight>::value,  SkTFixed<FC_WEIGHT_EXTRABOLD>::value },
         { SkTFixed<SkFS::kBlack_Weight>::value,      SkTFixed<FC_WEIGHT_BLACK>::value },
-        { SkTFixed<1000>::value,                     SkTFixed<FC_WEIGHT_EXTRABLACK>::value },
+        { SkTFixed<SkFS::kExtraBlack_Weight>::value, SkTFixed<FC_WEIGHT_EXTRABLACK>::value },
     };
     int weight = map_ranges(style.weight(), weightRanges, SK_ARRAY_COUNT(weightRanges));