Reland "Add plumbing for font-stretch"

Source/core/css/CSSFontValue.cpp

Index: Source/core/css/CSSFontValue.cpp
diff --git a/Source/core/css/CSSFontValue.cpp b/Source/core/css/CSSFontValue.cpp
index 7c73f960e7eb9b0c13de56e05c0512007c746e91..2cfe53c3e04cb5e266b1e7bcf056ef38970fbea5 100644
--- a/Source/core/css/CSSFontValue.cpp
+++ b/Source/core/css/CSSFontValue.cpp
@@ -44,6 +44,11 @@ String CSSFontValue::customCSSText() const
             result.append(' ');
         result.append(weight->cssText());
     }
+    if (stretch) {
+        if (!result.isEmpty())
+            result.append(' ');
+        result.append(stretch->cssText());
+    }
     if (size) {
         if (!result.isEmpty())
             result.append(' ');
@@ -69,6 +74,7 @@ bool CSSFontValue::equals(const CSSFontValue& other) const
     return compareCSSValuePtr(style, other.style)
         && compareCSSValuePtr(variant, other.variant)
         && compareCSSValuePtr(weight, other.weight)
+        && compareCSSValuePtr(stretch, other.stretch)
         && compareCSSValuePtr(size, other.size)
         && compareCSSValuePtr(lineHeight, other.lineHeight)
         && compareCSSValuePtr(family, other.family);
@@ -76,10 +82,10 @@ bool CSSFontValue::equals(const CSSFontValue& other) const
 
 void CSSFontValue::traceAfterDispatch(Visitor* visitor)
 {
-
     visitor->trace(style);
     visitor->trace(variant);
     visitor->trace(weight);
+    visitor->trace(stretch);
     visitor->trace(size);
     visitor->trace(lineHeight);
     visitor->trace(family);