Web Animations: Support animation of flood-opacity

Source/core/css/resolver/AnimatedStyleBuilder.cpp

Index: Source/core/css/resolver/AnimatedStyleBuilder.cpp
diff --git a/Source/core/css/resolver/AnimatedStyleBuilder.cpp b/Source/core/css/resolver/AnimatedStyleBuilder.cpp
index 4a062206249e3fa4552beff9228d93a669e6467c..a19259d91b800bebc78cb782861161f36c4c36c7 100644
--- a/Source/core/css/resolver/AnimatedStyleBuilder.cpp
+++ b/Source/core/css/resolver/AnimatedStyleBuilder.cpp
@@ -254,12 +254,15 @@ void AnimatedStyleBuilder::applyProperty(CSSPropertyID property, StyleResolverSt
     case CSSPropertyFlexBasis:
         style->setFlexBasis(animatableValueToLength(value, state, NonNegativeValues));
         return;
-    case CSSPropertyFontSize:
-        style->setFontSize(clampTo<float>(toAnimatableDouble(value)->toDouble(), 0));
-        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 CSSPropertyHeight:
         style->setHeight(animatableValueToLength(value, state, NonNegativeValues));
         return;