Add plumbing for font-stretch

Source/core/css/resolver/AnimatedStyleBuilder.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 @@
         case CSSPropertyWebkitMaskSize:
             fillLayer->clearSize();
             break;
         default:
             ASSERT_NOT_REACHED();
         }
         fillLayer = fillLayer->next();
     }
 }
 
+FontStretch animatableValueToFontStretch(const AnimatableValue* value)
+{
+    ASSERT(FontStretchUltraCondensed == 1 && FontStretchUltraExpanded == 9);
+    unsigned index = round(toAnimatableDouble(value)->toDouble()) - 1;
+    static const FontStretch stretchValues[] = {
+        FontStretchUltraCondensed,
+        FontStretchExtraCondensed,
+        FontStretchCondensed,
+        FontStretchSemiCondensed,
+        FontStretchNormal,
+        FontStretchSemiExpanded,
+        FontStretchExpanded,
+        FontStretchExtraExpanded,
+        FontStretchUltraExpanded
+    };
+
+    index = clampTo<unsigned>(index, 0, WTF_ARRAY_LENGTH(stretchValues) - 1);
+    return stretchValues[index];
+}
+
 FontWeight animatableValueToFontWeight(const AnimatableValue* value)
 {
     int index = round(toAnimatableDouble(value)->toDouble() / 100) - 1;
 
     static const FontWeight weights[] = {
         FontWeight100,
         FontWeight200,
         FontWeight300,
         FontWeight400,
         FontWeight500,
@@ skipping 127 matching lines @@
         return;
     case CSSPropertyFloodColor:
         style->setFloodColor(toAnimatableColor(value)->color());
         return;
     case CSSPropertyFloodOpacity:
         style->setFloodOpacity(clampTo<float>(toAnimatableDouble(value)->toDouble(), 0, 1));
         return;
     case CSSPropertyFontSize:
         style->setFontSize(clampTo<float>(toAnimatableDouble(value)->toDouble(), 0));
         return;
+    case CSSPropertyFontStretch:
+        style->setFontStretch(animatableValueToFontStretch(value));
+        return;
     case CSSPropertyFontWeight:
         style->setFontWeight(animatableValueToFontWeight(value));
         return;
     case CSSPropertyHeight:
         style->setHeight(animatableValueToLength(value, state, NonNegativeValues));
         return;
     case CSSPropertyKerning:
         style->setKerning(toAnimatableSVGLength(value)->toSVGLength());
         return;
     case CSSPropertyLeft:
@@ skipping 227 matching lines @@
         return;
     case CSSPropertyZoom:
         style->setZoom(clampTo<float>(toAnimatableDouble(value)->toDouble(), std::numeric_limits<float>::denorm_min()));
         return;
     default:
         ASSERT_NOT_REACHED();
     }
 }
 
 } // namespace WebCore