Use Skia's matchFamilyStyleCharacter API for font fallback

third_party/WebKit/Source/platform/fonts/FontDescription.cpp

Index: third_party/WebKit/Source/platform/fonts/FontDescription.cpp
diff --git a/third_party/WebKit/Source/platform/fonts/FontDescription.cpp b/third_party/WebKit/Source/platform/fonts/FontDescription.cpp
index 2008681e0ccd0973e5bae08faa3d38b697a41d62..0b221694ef79984a4ac34d938a60b6a846d30be9 100644
--- a/third_party/WebKit/Source/platform/fonts/FontDescription.cpp
+++ b/third_party/WebKit/Source/platform/fonts/FontDescription.cpp
@@ -278,4 +278,20 @@ unsigned FontDescription::styleHashWithoutFamilyList() const
     return hash;
 }
 
+SkFontStyle FontDescription::skiaFontStyle() const
+{
+    int width = static_cast<int>(stretch());
+    int fontWeight = (weight() - FontWeight100 + 1) * 100;

[eae, 2016/02/29 23:11:26]

We might want to add a helper for this. numericFontWeight for instance?

[Ilya Kulshin, 2016/03/01 03:31:14]

Done. Added a helper, although perhaps the actual numeric values of
FontWeightXXX should just be XXX (but I'm not going to make that change at this
time).

+    SkFontStyle::Slant slant = style() == FontStyleItalic
+        ? SkFontStyle::kItalic_Slant
+        : SkFontStyle::kUpright_Slant;
+    return SkFontStyle(fontWeight, width, slant);
+    static_assert(static_cast<int>(FontStretchUltraCondensed) == static_cast<int>(SkFontStyle::kUltraCondensed_Width),
+        "FontStretchUltraCondensed should map to kUltraCondensed_Width");
+    static_assert(static_cast<int>(FontStretchNormal) == static_cast<int>(SkFontStyle::kNormal_Width),
+        "FontStretchNormal should map to kNormal_Width");
+    static_assert(static_cast<int>(FontStretchUltraExpanded) == static_cast<int>(SkFontStyle::kUltaExpanded_Width),
+        "FontStretchUltraExpanded should map to kUltaExpanded_Width");
+}
+
 } // namespace blink