Fix for ::selection pseudo element to work on input elements

Source/core/rendering/RenderObject.cpp

Index: Source/core/rendering/RenderObject.cpp
diff --git a/Source/core/rendering/RenderObject.cpp b/Source/core/rendering/RenderObject.cpp
index 9c8086c3227d76a293079398053446b5ce96de1c..821b339488fd6471f2fd6c79767dbae623c75f11 100644
--- a/Source/core/rendering/RenderObject.cpp
+++ b/Source/core/rendering/RenderObject.cpp
@@ -1788,7 +1788,7 @@ Color RenderObject::selectionBackgroundColor() const
     if (!isSelectable())
         return Color::transparent;
 
-    if (RefPtr<RenderStyle> pseudoStyle = getUncachedPseudoStyle(PseudoStyleRequest(SELECTION)))
+    if (RefPtr<RenderStyle> pseudoStyle = getUncachedPseudoStyleFromParentOrShadowHost())
         return resolveColor(pseudoStyle.get(), CSSPropertyBackgroundColor).blendWithWhite();
     return frame()->selection().isFocusedAndActive() ?
         RenderTheme::theme().activeSelectionBackgroundColor() :
@@ -1802,7 +1802,7 @@ Color RenderObject::selectionColor(int colorProperty) const
     if (!isSelectable() || (frame()->view()->paintBehavior() & PaintBehaviorSelectionOnly))
         return resolveColor(colorProperty);
 
-    if (RefPtr<RenderStyle> pseudoStyle = getUncachedPseudoStyle(PseudoStyleRequest(SELECTION)))
+    if (RefPtr<RenderStyle> pseudoStyle = getUncachedPseudoStyleFromParentOrShadowHost())
         return resolveColor(pseudoStyle.get(), colorProperty);
     if (!RenderTheme::theme().supportsSelectionForegroundColors())
         return resolveColor(colorProperty);
@@ -2983,6 +2983,13 @@ PassRefPtr<RenderStyle> RenderObject::getUncachedPseudoStyle(const PseudoStyleRe
     return document().ensureStyleResolver().pseudoStyleForElement(element, pseudoStyleRequest, parentStyle);
 }
 
+PassRefPtr<RenderStyle> RenderObject::getUncachedPseudoStyleFromParentOrShadowHost() const
+{
+    if (node() && node()->shadowHost())
+        return node()->shadowHost()->renderer()->getUncachedPseudoStyle(PseudoStyleRequest(SELECTION));

[esprehn, 2014/04/10 22:20:38]

I don't think this is right. Now if you have:

<div> with a ShadowRoot and in the ShadowRoot you have <span> with
span::selection, we'll ignore the style you put on it and use the style from the
host.

+    return getUncachedPseudoStyle(PseudoStyleRequest(SELECTION));
+}
+
 bool RenderObject::hasBlendMode() const
 {
     return RuntimeEnabledFeatures::cssCompositingEnabled() && style() && style()->hasBlendMode();