Implement :valid and :invalid pseudoclass for <form> (resubmitting)

Source/core/css/resolver/SharedStyleFinder.cpp

Index: Source/core/css/resolver/SharedStyleFinder.cpp
diff --git a/Source/core/css/resolver/SharedStyleFinder.cpp b/Source/core/css/resolver/SharedStyleFinder.cpp
index ce16c0df1f0d4b7ef17a08556a3e785caf1906c7..2e37f8c28edca916ecb29c0898801b01b8aabfca 100644
--- a/Source/core/css/resolver/SharedStyleFinder.cpp
+++ b/Source/core/css/resolver/SharedStyleFinder.cpp
@@ -84,7 +84,7 @@ bool SharedStyleFinder::canShareStyleWithControl(Element& candidate) const
         if (willValidate != element().willValidate())
             return false;
 
-        if (willValidate && (candidate.isValidFormControlElement() != element().isValidFormControlElement()))
+        if (willValidate && (candidate.isValidElement() != element().isValidElement()))
             return false;
 
         if (candidate.isInRange() != element().isInRange())
@@ -265,6 +265,11 @@ bool SharedStyleFinder::canShareStyleWithElement(Element& candidate) const
             return false;
     }
 
+    if (document().containsValidityStyleRules()) {
+        if (candidate.isValidElement() != element().isValidElement())
+            return false;
+    }
+
     return true;
 }