Add oblique as a slant.

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 4b26f41ea5ffced03e534aa6eb07029dc01c35d4..610a3001fb2c66e5df68e2fe08f0c34d7c0644f0 100644
--- a/src/ports/SkFontMgr_fontconfig.cpp
+++ b/src/ports/SkFontMgr_fontconfig.cpp
@@ -345,9 +345,13 @@ static SkFontStyle skfontstyle_from_fcpattern(FcPattern* pattern) {
     int width = map_ranges(get_int(pattern, FC_WIDTH, FC_WIDTH_NORMAL),
                            widthRanges, SK_ARRAY_COUNT(widthRanges));
 
-    SkFS::Slant slant = get_int(pattern, FC_SLANT, FC_SLANT_ROMAN) > 0
-                             ? SkFS::kItalic_Slant
-                             : SkFS::kUpright_Slant;
+    SkFS::Slant slant = SkFS::kUpright_Slant;
+    switch (get_int(pattern, FC_SLANT, FC_SLANT_ROMAN)) {
+        case FC_SLANT_ROMAN:   slant = SkFS::kUpright_Slant; break;
+        case FC_SLANT_ITALIC : slant = SkFS::kItalic_Slant ; break;
+        case FC_SLANT_OBLIQUE: slant = SkFS::kOblique_Slant; break;
+        default: SkASSERT(false); break;
+    }
 
     return SkFontStyle(weight, width, slant);
 }
@@ -384,9 +388,17 @@ static void fcpattern_from_skfontstyle(SkFontStyle style, FcPattern* pattern) {
     };
     int width = map_ranges(style.width(), widthRanges, SK_ARRAY_COUNT(widthRanges));
 
+    int slant = FC_SLANT_ROMAN;
+    switch (style.slant()) {
+        case SkFS::kUpright_Slant: slant = FC_SLANT_ROMAN  ; break;
+        case SkFS::kItalic_Slant : slant = FC_SLANT_ITALIC ; break;
+        case SkFS::kOblique_Slant: slant = FC_SLANT_OBLIQUE; break;
+        default: SkASSERT(false); break;
+    }
+
     FcPatternAddInteger(pattern, FC_WEIGHT, weight);
-    FcPatternAddInteger(pattern, FC_WIDTH, width);
-    FcPatternAddInteger(pattern, FC_SLANT, style.isItalic() ? FC_SLANT_ITALIC : FC_SLANT_ROMAN);
+    FcPatternAddInteger(pattern, FC_WIDTH , width);
+    FcPatternAddInteger(pattern, FC_SLANT , slant);
 }
 
 class SkTypeface_stream : public SkTypeface_FreeType {