Refactor StyleInvalidator to encapsulate all style invalidation state.

Source/core/css/invalidation/StyleInvalidator.h

 // Copyright 2014 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 StyleInvalidator_h
 #define StyleInvalidator_h
 
-#include "core/css/RuleFeature.h"
 #include "heap/Heap.h"
 
 namespace WebCore {
 
+class DescendantInvalidationSet;
+class Document;
+class Element;
+
 class StyleInvalidator {
-    STACK_ALLOCATED();
 public:
-    explicit StyleInvalidator(Document&);
-    void invalidate();
+    explicit StyleInvalidator();

[esprehn, 2014/03/31 19:45:33]

You don't need explicit since this doesn't take any arguments.

[chrishtr, 2014/03/31 20:07:37]

Done.

+    void invalidate(Document&);
+    void scheduleInvalidation(PassRefPtr<DescendantInvalidationSet>, Element&);
+
+    // Clears all style invalidation state for the passed node.
+    void clearInvalidation(Node&);
+
+    void clearPendingInvalidations();
 
 private:
     bool invalidate(Element&);
     bool invalidateChildren(Element&);
 
     bool checkInvalidationSetsAgainstElement(Element&);
 
     struct RecursionData {
         RecursionData() : m_foundInvalidationSet(false) { }
         void pushInvalidationSet(const DescendantInvalidationSet&);
@@ skipping 20 matching lines @@
             m_data->m_foundInvalidationSet = m_prevFoundInvalidationSet;
         }
 
     private:
         int m_prevClassLength;
         int m_prevAttributeLength;
         bool m_prevFoundInvalidationSet;
         RecursionData* m_data;
     };
 
-    Document& m_document;
-    RuleFeatureSet::PendingInvalidationMap& m_pendingInvalidationMap;
+    typedef Vector<RefPtr<DescendantInvalidationSet> > InvalidationList;
+    typedef HashMap<Element*, OwnPtr<InvalidationList> > PendingInvalidationMap;
+
+    InvalidationList& ensurePendingInvalidationList(Element&);
+
+    PendingInvalidationMap m_pendingInvalidationMap;
     RecursionData m_recursionData;
 };
 
 } // namespace WebCore
 
 #endif // StyleInvalidator_h