Don't add rule features across ::content.

third_party/WebKit/Source/core/css/RuleFeatureSetTest.cpp

 // Copyright 2015 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "core/css/RuleFeature.h"
 
 #include "core/css/CSSSelectorList.h"
 #include "core/css/RuleSet.h"
 #include "core/css/StylePropertySet.h"
 #include "core/css/StyleRule.h"
@@ skipping 303 matching lines @@
 
 TEST_F(RuleFeatureSetTest, tagName)
 {
     updateInvalidationSets(":valid e");
 
     InvalidationLists invalidationLists;
     collectInvalidationSetsForPseudoClass(invalidationLists, CSSSelector::PseudoValid);
     expectTagNameInvalidation("e", invalidationLists.descendants);
 }
 
+TEST_F(RuleFeatureSetTest, contentPseudo)
+{
+    updateInvalidationSets(".a ::content .b");
+    updateInvalidationSets(".a .c");
+
+    InvalidationLists invalidationLists;
+    collectInvalidationSetsForClass(invalidationLists, "a");
+    expectClassInvalidation("c", invalidationLists.descendants);
+
+    updateInvalidationSets(".a .b");
+
+    invalidationLists.descendants.clear();
+    collectInvalidationSetsForClass(invalidationLists, "a");
+    expectClassesInvalidation("b", "c", invalidationLists.descendants);
+}
+
 } // namespace blink