Do not treat '0' as 'none' for font-size-adjust

Source/core/animation/StringKeyframe.cpp

 // Copyright 2014 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "config.h"
 #include "core/animation/StringKeyframe.h"
 
 #include "core/animation/ColorStyleInterpolation.h"
 #include "core/animation/CompositorAnimations.h"
 #include "core/animation/ConstantStyleInterpolation.h"
@@ skipping 203 matching lines @@
 
         // FIXME: Handle keywords e.g. 'smaller', 'larger'.
         if (property == CSSPropertyFontSize)
             fallBackToLegacy = true;
 
         // FIXME: Handle keywords e.g. 'baseline', 'sub'.
         if (property == CSSPropertyBaselineShift)
             fallBackToLegacy = true;
 
         break;
-    case CSSPropertyFontSizeAdjust:
-        // FIXME: Requires special handing for 0.
-        fallBackToLegacy = true;
-        break;
     case CSSPropertyOrphans:
     case CSSPropertyWidows:
     case CSSPropertyZIndex:
     case CSSPropertyWebkitColumnCount:
     case CSSPropertyShapeImageThreshold:
     case CSSPropertyFillOpacity:
     case CSSPropertyFloodOpacity:
+    case CSSPropertyFontSizeAdjust:
     case CSSPropertyOpacity:
     case CSSPropertyStopOpacity:
     case CSSPropertyStrokeOpacity:
     case CSSPropertyStrokeMiterlimit:
         if (DoubleStyleInterpolation::canCreateFrom(*fromCSSValue) && DoubleStyleInterpolation::canCreateFrom(*toCSSValue))
             return DoubleStyleInterpolation::create(*fromCSSValue, *toCSSValue, property, toCSSPrimitiveValue(fromCSSValue)->primitiveType(), setRange(property));
         break;
 
     case CSSPropertyMotionRotation: {
         RefPtrWillBeRawPtr<Interpolation> interpolation = DoubleStyleInterpolation::maybeCreateFromMotionRotation(*fromCSSValue, *toCSSValue, property);
@@ skipping 164 matching lines @@
 }
 
 DEFINE_TRACE(StringKeyframe::PropertySpecificKeyframe)
 {
     visitor->trace(m_value);
     visitor->trace(m_animatableValueCache);
     Keyframe::PropertySpecificKeyframe::trace(visitor);
 }
 
 }