Collect active stylesheets and and apply asynchronously.

third_party/WebKit/Source/core/dom/TreeScopeStyleSheetCollection.h

 /*
  * Copyright (C) 1999 Lars Knoll (knoll@kde.org)
  *           (C) 1999 Antti Koivisto (koivisto@kde.org)
  *           (C) 2001 Dirk Mueller (mueller@kde.org)
  *           (C) 2006 Alexey Proskuryakov (ap@webkit.org)
  * Copyright (C) 2004, 2005, 2006, 2007, 2008, 2009, 2010, 2012 Apple Inc. All
  * rights reserved.
  * Copyright (C) 2008, 2009 Torch Mobile Inc. All rights reserved.
  * (http://www.torchmobile.com/)
  * Copyright (C) 2010 Nokia Corporation and/or its subsidiary(-ies)
@@ skipping 13 matching lines @@
  * along with this library; see the file COPYING.LIB.  If not, write to
  * the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
  * Boston, MA 02110-1301, USA.
  *
  */
 
 #ifndef TreeScopeStyleSheetCollection_h
 #define TreeScopeStyleSheetCollection_h
 
 #include "core/CoreExport.h"
-#include "core/dom/Document.h"
 #include "core/dom/DocumentOrderedList.h"
 #include "core/dom/StyleSheetCollection.h"
 #include "core/dom/TreeScope.h"
-#include "wtf/HashMap.h"
-#include "wtf/ListHashSet.h"
-#include "wtf/Vector.h"
-#include "wtf/text/WTFString.h"
 
 namespace blink {
 
+class Document;
 class Node;
-class StyleSheetContents;
-class StyleRuleFontFace;
 
 class CORE_EXPORT TreeScopeStyleSheetCollection : public StyleSheetCollection {
  public:
   void addStyleSheetCandidateNode(Node&);
   void removeStyleSheetCandidateNode(Node& node) {
     m_styleSheetCandidateNodes.remove(&node);
   }
   bool hasStyleSheetCandidateNodes() const {
     return !m_styleSheetCandidateNodes.isEmpty();
   }
 
-  void clearMediaQueryRuleSetStyleSheets();
+  bool mediaQueryAffectingValueChanged();
 
   virtual bool isShadowTreeStyleSheetCollection() const { return false; }
 
   DECLARE_VIRTUAL_TRACE();
 
  protected:
   explicit TreeScopeStyleSheetCollection(TreeScope&);
 
   Document& document() const { return treeScope().document(); }
   TreeScope& treeScope() const { return *m_treeScope; }
 
-  enum StyleResolverUpdateType { Reconstruct, Reset, Additive };
+  void applyActiveStyleSheetChanges(StyleSheetCollection&);
 
-  class StyleSheetChange {
-    STACK_ALLOCATED();
-
-   public:
-    StyleResolverUpdateType styleResolverUpdateType;
-    bool requiresFullStyleRecalc;
-    HeapVector<Member<const StyleRuleFontFace>> fontFaceRulesToRemove;
-
-    StyleSheetChange()
-        : styleResolverUpdateType(Reconstruct), requiresFullStyleRecalc(true) {}
-  };
-
-  void analyzeStyleSheetChange(StyleResolverUpdateMode,
-                               const HeapVector<Member<CSSStyleSheet>>&,
-                               StyleSheetChange&);
+  Member<TreeScope> m_treeScope;
+  DocumentOrderedList m_styleSheetCandidateNodes;
 
  private:
-  static StyleResolverUpdateType compareStyleSheets(
-      const HeapVector<Member<CSSStyleSheet>>& oldStyleSheets,
-      const HeapVector<Member<CSSStyleSheet>>& newStylesheets,
-      HeapVector<Member<StyleSheetContents>>& addedSheets);
-  bool activeLoadingStyleSheetLoaded(
-      const HeapVector<Member<CSSStyleSheet>>& newStyleSheets);
-
   friend class TreeScopeStyleSheetCollectionTest;
-
- protected:
-  Member<TreeScope> m_treeScope;
-  bool m_hadActiveLoadingStylesheet;
-
-  DocumentOrderedList m_styleSheetCandidateNodes;
 };
 
 }  // namespace blink
 
 #endif