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..8859c394b148db83ef0f47fa02a3fae398c03884 100644
--- a/Source/core/rendering/RenderObject.cpp
+++ b/Source/core/rendering/RenderObject.cpp
@@ -1788,8 +1788,18 @@ Color RenderObject::selectionBackgroundColor() const
     if (!isSelectable())
         return Color::transparent;
 
-    if (RefPtr<RenderStyle> pseudoStyle = getUncachedPseudoStyle(PseudoStyleRequest(SELECTION)))
+    RefPtr<RenderStyle> pseudoStyle;
+    if (node() && node()->shadowHost()) {
+        // If the element is in shadow tree of input element, then get the PseudoStyle
+        // from the input element.
+        pseudoStyle = node()->shadowHost()->renderer()->getUncachedPseudoStyle(PseudoStyleRequest(SELECTION));
+    } else {
+        pseudoStyle = getUncachedPseudoStyle(PseudoStyleRequest(SELECTION));
+    }
+
+    if (pseudoStyle)
         return resolveColor(pseudoStyle.get(), CSSPropertyBackgroundColor).blendWithWhite();
+
     return frame()->selection().isFocusedAndActive() ?
         RenderTheme::theme().activeSelectionBackgroundColor() :
         RenderTheme::theme().inactiveSelectionBackgroundColor();
@@ -1802,8 +1812,18 @@ Color RenderObject::selectionColor(int colorProperty) const
     if (!isSelectable() || (frame()->view()->paintBehavior() & PaintBehaviorSelectionOnly))
         return resolveColor(colorProperty);
 
-    if (RefPtr<RenderStyle> pseudoStyle = getUncachedPseudoStyle(PseudoStyleRequest(SELECTION)))
+    RefPtr<RenderStyle> pseudoStyle;
+    if (node() && node()->shadowHost()) {
+        // If the element is in shadow tree of input element, then get the PseudoStyle
+        // from the input element.
+        pseudoStyle = node()->shadowHost()->renderer()->getUncachedPseudoStyle(PseudoStyleRequest(SELECTION));
+    } else {
+        pseudoStyle = getUncachedPseudoStyle(PseudoStyleRequest(SELECTION));

[esprehn, 2014/04/09 20:36:06]

Why isn't this in a method, you do the exact same thing in two places?

+    }
+
+    if (pseudoStyle)
         return resolveColor(pseudoStyle.get(), colorProperty);
+
     if (!RenderTheme::theme().supportsSelectionForegroundColors())
         return resolveColor(colorProperty);
     return frame()->selection().isFocusedAndActive() ?