Add support for multiple text decorations with same line positioning

third_party/WebKit/Source/core/css/resolver/StyleAdjuster.cpp

Index: third_party/WebKit/Source/core/css/resolver/StyleAdjuster.cpp
diff --git a/third_party/WebKit/Source/core/css/resolver/StyleAdjuster.cpp b/third_party/WebKit/Source/core/css/resolver/StyleAdjuster.cpp
index 9d584a4a6caa665d2a41eeffbbe769a7faa1e1e8..a32034e8bf24ffd92495d7c966aef57a46523b4c 100644
--- a/third_party/WebKit/Source/core/css/resolver/StyleAdjuster.cpp
+++ b/third_party/WebKit/Source/core/css/resolver/StyleAdjuster.cpp
@@ -112,7 +112,18 @@ static bool doesNotInheritTextDecoration(const ComputedStyle& style, const Eleme
 {
     return style.display() == INLINE_TABLE
         || style.display() == INLINE_BLOCK || style.display() == INLINE_BOX || isAtShadowBoundary(element)
-        || style.isFloating() || style.hasOutOfFlowPosition() || isOutermostSVGElement(element);
+        || style.isFloating() || style.hasOutOfFlowPosition() || isOutermostSVGElement(element)
+        || isHTMLRTElement(element);
+}
+
+// Certain elements (<a>, <font>) override text decoration colors.
+// "The font element is expected to override the color of any text decoration that
+// spans the text of the element to the used value of the element's 'color' property."
+// (from https://html.spec.whatwg.org/multipage/rendering.html#phrasing-content-3)
+// The <a> behavior is non-standard.
+static bool overridesTextDecorationColors(const Element* element)
+{
+    return element && (isHTMLFontElement(element) || isHTMLAnchorElement(element));
 }
 
 // FIXME: This helper is only needed because pseudoStyleForElement passes a null
@@ -209,7 +220,7 @@ void StyleAdjuster::adjustComputedStyle(ComputedStyle& style, const ComputedStyl
     if (doesNotInheritTextDecoration(style, element))
         style.clearAppliedTextDecorations();
 
-    style.applyTextDecorations();
+    style.applyTextDecorations(parentStyle.visitedDependentColor(CSSPropertyTextDecorationColor), overridesTextDecorationColors(element));
 
     if (style.overflowX() != OVISIBLE || style.overflowY() != OVISIBLE)
         adjustOverflow(style);