Make font-weight animatable.

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 212 matching lines @@
     return AnimatableColor::create(color, visitedLinkColor);
 }
 
 inline static PassRefPtr<AnimatableValue> createFromShapeValue(ShapeValue* value)
 {
     if (value)
         return AnimatableShapeValue::create(value);
     return AnimatableUnknown::create(CSSValueAuto);
 }
 
+static double fontWeightToDouble(FontWeight fontWeight)
+{
+    switch (fontWeight) {
+    case FontWeight100:
+        return 100;
+    case FontWeight200:
+        return 200;
+    case FontWeight300:
+        return 300;
+    case FontWeight400:
+        return 400;
+    case FontWeight500:
+        return 500;
+    case FontWeight600:
+        return 600;
+    case FontWeight700:
+        return 700;
+    case FontWeight800:
+        return 800;
+    case FontWeight900:
+        return 900;
+    }
+
+    ASSERT_NOT_REACHED();
+    return 400;
+}
+
+static PassRefPtr<AnimatableValue> createFromFontWeight(FontWeight fontWeight)
+{
+    return createFromDouble(fontWeightToDouble(fontWeight));
+}
+
 // FIXME: Generate this function.
 PassRefPtr<AnimatableValue> CSSAnimatableValueFactory::create(CSSPropertyID property, const RenderStyle& style)
 {
     ASSERT(CSSAnimations::isAnimatableProperty(property));
     switch (property) {
     case CSSPropertyBackgroundColor:
         return createFromColor(property, style);
     case CSSPropertyBackgroundImage:
         return createFromFillLayers<CSSPropertyBackgroundImage>(style.backgroundLayers(), style);
     case CSSPropertyBackgroundPositionX:
@@ skipping 61 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 CSSPropertyFontWeight:
+        return createFromFontWeight(style.fontWeight());
     case CSSPropertyHeight:
         return createFromLength(style.height(), style);
     case CSSPropertyKerning:
         return AnimatableSVGLength::create(style.kerning());
     case CSSPropertyLightingColor:
         return createFromColor(property, style);
     case CSSPropertyListStyleImage:
         return createFromStyleImage(style.listStyleImage());
     case CSSPropertyLeft:
         return createFromLength(style.left(), style);
@@ skipping 136 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 WebCore