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 ee7c9c519961a8cd7c08afe823552b02850ec49f..d46ad24a5e79fa2a38b8183ccafb255be3c0d1cf 100644
--- a/Source/core/rendering/RenderObject.cpp
+++ b/Source/core/rendering/RenderObject.cpp
@@ -1780,6 +1780,17 @@ Color RenderObject::selectionBackgroundColor() const
 
     if (RefPtr<RenderStyle> pseudoStyle = getUncachedPseudoStyle(PseudoStyleRequest(SELECTION)))
         return resolveColor(pseudoStyle.get(), CSSPropertyBackgroundColor).blendWithWhite();
+
+    // If the element is in shadow tree of input element, then get the PseudoStyle
+    // from the input element.
+    if (node() && node()->shadowHost()) {
+        RenderObject* shadowHostRenderer = node()->shadowHost()->renderer();

[esprehn, 2014/04/03 19:59:07]

Your host must have a renderer if you do. The null check below doesn't make
sense.

[deepak.sa, 2014/04/07 15:20:00]

Done.

+        if (shadowHostRenderer && shadowHostRenderer->isTextControl()) {
+            if (RefPtr<RenderStyle> pseudoStyle = shadowHostRenderer->getUncachedPseudoStyle(PseudoStyleRequest(SELECTION)))
+                return resolveColor(pseudoStyle.get(), CSSPropertyBackgroundColor).blendWithWhite();
+        }
+    }
+
     return frame()->selection().isFocusedAndActive() ?
         RenderTheme::theme().activeSelectionBackgroundColor() :
         RenderTheme::theme().inactiveSelectionBackgroundColor();
@@ -1794,6 +1805,17 @@ Color RenderObject::selectionColor(int colorProperty) const
 
     if (RefPtr<RenderStyle> pseudoStyle = getUncachedPseudoStyle(PseudoStyleRequest(SELECTION)))
         return resolveColor(pseudoStyle.get(), colorProperty);
+
+    // If the element is in shadow tree of input element, then get the PseudoStyle
+    // from the input element.
+    if (node() && node()->shadowHost()) {
+        RenderObject* shadowHostRenderer = node()->shadowHost()->renderer();
+        if (shadowHostRenderer && shadowHostRenderer->isTextControl()) {
+            if (RefPtr<RenderStyle> pseudoStyle = shadowHostRenderer->getUncachedPseudoStyle(PseudoStyleRequest(SELECTION)))
+                return resolveColor(pseudoStyle.get(), colorProperty);
+        }
+    }
+
     if (!RenderTheme::theme().supportsSelectionForegroundColors())
         return resolveColor(colorProperty);
     return frame()->selection().isFocusedAndActive() ?