Avoid sub-tree style recalc for ::selection.

Source/core/css/RuleFeature.cpp

Index: Source/core/css/RuleFeature.cpp
diff --git a/Source/core/css/RuleFeature.cpp b/Source/core/css/RuleFeature.cpp
index 272b9b06ce26109250e0f41884055f8a8e5f32f2..4e5d91ba5be240e3961d6213ad9aa25838ea4081 100644
--- a/Source/core/css/RuleFeature.cpp
+++ b/Source/core/css/RuleFeature.cpp
@@ -117,6 +117,8 @@ static bool supportsInvalidation(CSSSelector::PseudoType type)
     case CSSSelector::PseudoScrollbarThumb:
     case CSSSelector::PseudoScrollbarTrack:
     case CSSSelector::PseudoScrollbarTrackPiece:
+    case CSSSelector::PseudoWindowInactive:
+    case CSSSelector::PseudoSelection:
     case CSSSelector::PseudoInRange:
     case CSSSelector::PseudoOutOfRange:
     case CSSSelector::PseudoUnresolved:
@@ -154,7 +156,6 @@ static bool requiresSubtreeInvalidation(const CSSSelector& selector)
     case CSSSelector::PseudoFirstLetter:
     case CSSSelector::PseudoFullPageMedia:
     case CSSSelector::PseudoResizer:
-    case CSSSelector::PseudoWindowInactive:
     case CSSSelector::PseudoCornerPresent:
     case CSSSelector::PseudoDecrement:
     case CSSSelector::PseudoIncrement:
@@ -165,7 +166,6 @@ static bool requiresSubtreeInvalidation(const CSSSelector& selector)
     case CSSSelector::PseudoDoubleButton:
     case CSSSelector::PseudoSingleButton:
     case CSSSelector::PseudoNoButton:
-    case CSSSelector::PseudoSelection:
     case CSSSelector::PseudoFullScreen:
     case CSSSelector::PseudoFullScreenDocument:
     case CSSSelector::PseudoFullScreenAncestor: