Fix broken transition for text-decoration-color.

Source/core/animation/css/CSSPropertyEquality.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/css/CSSPropertyEquality.h"
 
 #include "core/animation/css/CSSAnimations.h"
 #include "core/rendering/style/RenderStyle.h"
 #include "core/rendering/style/ShadowList.h"
@@ skipping 207 matching lines @@
         return ptrsOrValuesEqual<PassRefPtr<SVGLengthList> >(a.strokeDashArray(), b.strokeDashArray());
     case CSSPropertyStrokeDashoffset:
         return ptrsOrValuesEqual<PassRefPtr<SVGLength> >(a.strokeDashOffset(), b.strokeDashOffset());
     case CSSPropertyStrokeMiterlimit:
         return a.strokeMiterLimit() == b.strokeMiterLimit();
     case CSSPropertyStrokeOpacity:
         return a.strokeOpacity() == b.strokeOpacity();
     case CSSPropertyStrokeWidth:
         return ptrsOrValuesEqual<PassRefPtr<SVGLength> >(a.strokeWidth(), b.strokeWidth());
     case CSSPropertyTextDecorationColor:
-        // FIXME: transitions of text-decoration-color are broken
-        return true;
+        return a.textDecorationColor().resolve(a.color()) == b.textDecorationColor().resolve(b.color())
+            && a.visitedLinkTextDecorationColor().resolve(a.color()) == b.visitedLinkTextDecorationColor().resolve(b.color());
     case CSSPropertyTextIndent:
         return a.textIndent() == b.textIndent();
     case CSSPropertyTextShadow:
         return ptrsOrValuesEqual<ShadowList*>(a.textShadow(), b.textShadow());
     case CSSPropertyTop:
         return a.top() == b.top();
     case CSSPropertyVisibility:
         return a.visibility() == b.visibility();
     case CSSPropertyWebkitBackgroundSize:
         return fillLayersEqual<CSSPropertyWebkitBackgroundSize>(a.backgroundLayers(), b.backgroundLayers());
@@ skipping 61 matching lines @@
         return a.zIndex() == b.zIndex();
     case CSSPropertyZoom:
         return a.zoom() == b.zoom();
     default:
         ASSERT_NOT_REACHED();
         return true;
     }
 }
 
 }