Respect fallback colors when interpolating text-decoration-color.

Source/core/rendering/style/RenderStyle.cpp

Index: Source/core/rendering/style/RenderStyle.cpp
diff --git a/Source/core/rendering/style/RenderStyle.cpp b/Source/core/rendering/style/RenderStyle.cpp
index 5dcb788e556cd2aa2baea22ad982534606fc08e4..43f5439d373c7d7652ba3e86e1c2c5cd7378a0d5 100644
--- a/Source/core/rendering/style/RenderStyle.cpp
+++ b/Source/core/rendering/style/RenderStyle.cpp
@@ -1271,7 +1271,7 @@ void RenderStyle::applyTextDecorations()
         return;
 
     TextDecorationStyle style = textDecorationStyle();
-    StyleColor styleColor = visitedDependentDecorationStyleColor();
+    StyleColor styleColor = decorationColorIncludingFallback(insideLink() == InsideVisitedLink);
 
     int decorations = textDecoration();
 
@@ -1382,29 +1382,21 @@ void RenderStyle::getShadowVerticalExtent(const ShadowList* shadowList, LayoutUn
     }
 }
 
-StyleColor RenderStyle::visitedDependentDecorationStyleColor() const
+StyleColor RenderStyle::decorationColorIncludingFallback(bool visitedLink) const
 {
-    bool isVisited = insideLink() == InsideVisitedLink;
-
-    StyleColor styleColor = isVisited ? visitedLinkTextDecorationColor() : textDecorationColor();
+    StyleColor styleColor = visitedLink ? visitedLinkTextDecorationColor() : textDecorationColor();
 
     if (!styleColor.isCurrentColor())
         return styleColor;
 
     if (textStrokeWidth()) {
         // Prefer stroke color if possible, but not if it's fully transparent.
-        StyleColor textStrokeStyleColor = isVisited ? visitedLinkTextStrokeColor() : textStrokeColor();
+        StyleColor textStrokeStyleColor = visitedLink ? visitedLinkTextStrokeColor() : textStrokeColor();
         if (!textStrokeStyleColor.isCurrentColor() && textStrokeStyleColor.color().alpha())
             return textStrokeStyleColor;
     }
 
-    return isVisited ? visitedLinkTextFillColor() : textFillColor();
-}
-
-Color RenderStyle::visitedDependentDecorationColor() const
-{
-    bool isVisited = insideLink() == InsideVisitedLink;
-    return visitedDependentDecorationStyleColor().resolve(isVisited ? visitedLinkColor() : color());
+    return visitedLink ? visitedLinkTextFillColor() : textFillColor();
 }
 
 Color RenderStyle::colorIncludingFallback(int colorProperty, bool visitedLink) const
@@ -1461,6 +1453,9 @@ Color RenderStyle::colorIncludingFallback(int colorProperty, bool visitedLink) c
     case CSSPropertyWebkitTapHighlightColor:
         result = tapHighlightColor();
         break;
+    case CSSPropertyTextDecorationColor:
+        result = decorationColorIncludingFallback(visitedLink);
+        break;
     default:
         ASSERT_NOT_REACHED();
         break;