Current work-in-progress crbug.com/567021

third_party/WebKit/Source/core/css/CSSGlobalRuleSet.h

Index: third_party/WebKit/Source/core/css/CSSGlobalRuleSet.h
diff --git a/third_party/WebKit/Source/core/css/CSSGlobalRuleSet.h b/third_party/WebKit/Source/core/css/CSSGlobalRuleSet.h
new file mode 100644
index 0000000000000000000000000000000000000000..2a9ca267e2e7ffe2239ea86f650d2d1ca8ce7049
--- /dev/null
+++ b/third_party/WebKit/Source/core/css/CSSGlobalRuleSet.h
@@ -0,0 +1,35 @@
+// Copyright 2016 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.
+
+#ifndef CSSGlobalRuleSet_h
+#define CSSGlobalRuleSet_h
+
+#include "core/css/RuleFeature.h"
+
+namespace blink {
+
+class Document;
+class RuleSet;
+class StyleEngine;
+
+class CSSGlobalRuleSet {
+    DISALLOW_NEW();
+    WTF_MAKE_NONCOPYABLE(CSSGlobalRuleSet);
+public:
+    CSSGlobalRuleSet() { }
+
+    void initWatchedSelectorsRuleSet(Document&);
+    void update(Document&);
+
+    DECLARE_TRACE();
+
+    RuleFeatureSet m_features;
+    Member<RuleSet> m_siblingRuleSet;
+    Member<RuleSet> m_uncommonAttributeRuleSet;
+    Member<RuleSet> m_watchedSelectorsRuleSet;
+};
+
+} // namespace blink
+
+#endif // CSSGlobalRuleSet_h