Reland "Add plumbing for font-stretch"

Source/core/css/StylePropertySerializer.cpp

Index: Source/core/css/StylePropertySerializer.cpp
diff --git a/Source/core/css/StylePropertySerializer.cpp b/Source/core/css/StylePropertySerializer.cpp
index 3f2d5480a5dcee12439ba2830989ee8ebce3ffa2..9449a02c17ab1dc222a0d9c89a77d37916a81e4f 100644
--- a/Source/core/css/StylePropertySerializer.cpp
+++ b/Source/core/css/StylePropertySerializer.cpp
@@ -130,6 +130,7 @@ String StylePropertySerializer::asText() const
         case CSSPropertyFontFamily:
         case CSSPropertyLineHeight:
         case CSSPropertyFontSize:
+        case CSSPropertyFontStretch:
         case CSSPropertyFontStyle:
         case CSSPropertyFontVariant:
         case CSSPropertyFontWeight:
@@ -365,6 +366,7 @@ void StylePropertySerializer::appendFontLonghandValueIfExplicit(CSSPropertyID pr
     case CSSPropertyFontStyle:
         break; // No prefix.
     case CSSPropertyFontFamily:
+    case CSSPropertyFontStretch:
     case CSSPropertyFontVariant:
     case CSSPropertyFontWeight:
         prefix = ' ';
@@ -401,6 +403,7 @@ String StylePropertySerializer::fontValue() const
     appendFontLonghandValueIfExplicit(CSSPropertyFontStyle, result, commonValue);
     appendFontLonghandValueIfExplicit(CSSPropertyFontVariant, result, commonValue);
     appendFontLonghandValueIfExplicit(CSSPropertyFontWeight, result, commonValue);
+    appendFontLonghandValueIfExplicit(CSSPropertyFontStretch, result, commonValue);
     if (!result.isEmpty())
         result.append(' ');
     result.append(fontSizeProperty.value()->cssText());