Current work-in-progress crbug.com/567021

third_party/WebKit/Source/core/dom/DocumentStyleSheetCollection.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)
  * Copyright (C) 2013 Google Inc. All rights reserved.
  *
@@ skipping 16 matching lines @@
 
 #ifndef DocumentStyleSheetCollection_h
 #define DocumentStyleSheetCollection_h
 
 #include "core/dom/TreeScopeStyleSheetCollection.h"
 #include "platform/heap/WrapperVisitor.h"
 
 namespace blink {
 
 class DocumentStyleSheetCollector;
-class StyleEngine;
 class TreeScope;
 
 class DocumentStyleSheetCollection final : public TreeScopeStyleSheetCollection {
     WTF_MAKE_NONCOPYABLE(DocumentStyleSheetCollection);
 public:
     static DocumentStyleSheetCollection* create(TreeScope& treeScope)
     {
         return new DocumentStyleSheetCollection(treeScope);
     }
 
-    void updateActiveStyleSheets(StyleEngine&, StyleResolverUpdateMode);
-    void collectStyleSheets(StyleEngine&, DocumentStyleSheetCollector&);
+    void updateViewport();
+    void updateActiveStyleSheets();
+    void collectStyleSheets(DocumentStyleSheetCollector&);
 
     DEFINE_INLINE_VIRTUAL_TRACE()
     {
         TreeScopeStyleSheetCollection::trace(visitor);
     }
 
     DECLARE_VIRTUAL_TRACE_WRAPPERS();
 
 private:
     explicit DocumentStyleSheetCollection(TreeScope&);
 
-    void collectStyleSheetsFromCandidates(StyleEngine&, DocumentStyleSheetCollector&);
+    void collectStyleSheetsFromCandidates(DocumentStyleSheetCollector&);
 };
 
 } // namespace blink
 
 #endif