Web Animations CSS: Fix crash when animating viewport units

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 80 matching lines @@
     case ExtendToZoom: // Does not apply to elements.
         ASSERT_NOT_REACHED();
         return 0;
     }
     ASSERT_NOT_REACHED();
     return 0;
 }
 
 static PassRefPtr<AnimatableValue> createFromLineHeight(const Length& length, const RenderStyle& style)
 {
-    double value = length.value();
-    switch (length.type()) {
-    case Fixed:
-        return AnimatableLength::create(adjustFloatForAbsoluteZoom(value, style), AnimatableLength::UnitTypePixels);
-    case Percent:
+    if (length.type() == Percent) {
+        double value = length.value();
         // -100% is used to represent "normal" line height.
         if (value == -100)
             return AnimatableUnknown::create(CSSValueNormal);
         return AnimatableDouble::create(value);
-    default:
-        ASSERT_NOT_REACHED();
-        return 0;
     }
+    return createFromLength(length, style);
 }
 
 inline static PassRefPtr<AnimatableValue> createFromDouble(double value, AnimatableDouble::Constraint constraint = AnimatableDouble::Unconstrained)
 {
     return AnimatableDouble::create(value, constraint);
 }
 
 inline static PassRefPtr<AnimatableValue> createFromLengthBox(const LengthBox& lengthBox, const RenderStyle& style)
 {
     return AnimatableLengthBox::create(
@@ skipping 354 matching lines @@
         return createFromDouble(style.zoom());
     default:
         ASSERT_WITH_MESSAGE(!CSSAnimations::isAnimatableProperty(property), "Web Animations not yet implemented: Create AnimatableValue from render style: %s", getPropertyNameString(property).utf8().data());
         ASSERT_NOT_REACHED();
         // This return value is to avoid a release crash if possible.
         return AnimatableUnknown::create(0);
     }
 }
 
 } // namespace WebCore