Reland "Add plumbing for font-stretch"

Source/core/animation/css/CSSAnimatableValueFactory.cpp

 /*
  * Copyright (C) 2013 Google Inc. All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions are
  * met:
  *
  *     * Redistributions of source code must retain the above copyright
  * notice, this list of conditions and the following disclaimer.
  *     * Redistributions in binary form must reproduce the above
@@ skipping 207 matching lines @@
     return AnimatableColor::create(color, visitedLinkColor);
 }
 
 inline static PassRefPtrWillBeRawPtr<AnimatableValue> createFromShapeValue(ShapeValue* value)
 {
     if (value)
         return AnimatableShapeValue::create(value);
     return AnimatableUnknown::create(CSSValueNone);
 }
 
+static double fontStretchToDouble(FontStretch fontStretch)
+{
+    return static_cast<unsigned>(fontStretch);
+}
+
+static PassRefPtr<AnimatableValue> createFromFontStretch(FontStretch fontStretch)
+{
+    return createFromDouble(fontStretchToDouble(fontStretch));
+}
+
 static double fontWeightToDouble(FontWeight fontWeight)
 {
     switch (fontWeight) {
     case FontWeight100:
         return 100;
     case FontWeight200:
         return 200;
     case FontWeight300:
         return 300;
     case FontWeight400:
@@ skipping 96 matching lines @@
     case CSSPropertyFloodColor:
         return createFromColor(property, style);
     case CSSPropertyFloodOpacity:
         return createFromDouble(style.floodOpacity());
     case CSSPropertyFontSize:
         // Must pass a specified size to setFontSize if Text Autosizing is enabled, but a computed size
         // if text zoom is enabled (if neither is enabled it's irrelevant as they're probably the same).
         // FIXME: Should we introduce an option to pass the computed font size here, allowing consumers to
         // enable text zoom rather than Text Autosizing? See http://crbug.com/227545.
         return createFromDouble(style.specifiedFontSize());
+    case CSSPropertyFontStretch:
+        return createFromFontStretch(style.fontStretch());
     case CSSPropertyFontWeight:
         return createFromFontWeight(style.fontWeight());
     case CSSPropertyHeight:
         return createFromLength(style.height(), style);
     case CSSPropertyLightingColor:
         return createFromColor(property, style);
     case CSSPropertyListStyleImage:
         return createFromStyleImage(style.listStyleImage());
     case CSSPropertyLeft:
         return createFromLength(style.left(), style);
@@ skipping 140 matching lines @@
     case CSSPropertyZoom:
         return createFromDouble(style.zoom());
     default:
         ASSERT_NOT_REACHED();
         // This return value is to avoid a release crash if possible.
         return AnimatableUnknown::create(nullptr);
     }
 }
 
 } // namespace blink