Backend for css rule tracking

third_party/WebKit/Source/core/dom/StyleEngine.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 39 matching lines @@
 #include <memory>
 
 namespace blink {
 
 class CSSFontSelector;
 class CSSStyleSheet;
 class Node;
 class RuleFeatureSet;
 class ShadowTreeStyleSheetCollection;
 class StyleRuleFontFace;
+class StyleRuleUsageTracker;
 class StyleSheet;
 class StyleSheetContents;
 class ViewportStyleResolver;
 
 class CORE_EXPORT StyleEngine final
     : public GarbageCollectedFinalized<StyleEngine>,
       public CSSFontSelectorClient,
       public TraceWrapperBase {
   USING_GARBAGE_COLLECTED_MIXIN(StyleEngine);
 
@@ skipping 88 matching lines @@
 
   void didRemoveShadowRoot(ShadowRoot*);
   void shadowRootRemovedFromDocument(ShadowRoot*);
   void appendActiveAuthorStyleSheets();
   void addTreeBoundaryCrossingScope(const TreeScope&);
   const DocumentOrderedList& treeBoundaryCrossingScopes() const {
     return m_treeBoundaryCrossingScopes;
   }
   void resetAuthorStyle(TreeScope&);
 
+  void setRuleUsageTracker(StyleRuleUsageTracker*);
+
   StyleResolver* resolver() const { return m_resolver.get(); }
 
   StyleResolver& ensureResolver() {
     if (!m_resolver) {
       createResolver();
     } else if (m_resolver->hasPendingAuthorStyleSheets()) {
       viewportRulesChanged();
       m_resolver->appendPendingAuthorStyleSheets();
     }
     return *m_resolver.get();
@@ skipping 114 matching lines @@
   // Track the number of currently loading top-level stylesheets needed for
   // layout.  Sheets loaded using the @import directive are not included in this
   // count.  We use this count of pending sheets to detect when we can begin
   // attaching elements and when it is safe to execute scripts.
   int m_pendingScriptBlockingStylesheets = 0;
   int m_pendingRenderBlockingStylesheets = 0;
 
   HeapVector<Member<CSSStyleSheet>> m_injectedAuthorStyleSheets;
   Member<CSSStyleSheet> m_inspectorStyleSheet;
 
+  Member<StyleRuleUsageTracker> m_tracker;
+
   Member<DocumentStyleSheetCollection> m_documentStyleSheetCollection;
 
   typedef HeapHashMap<WeakMember<TreeScope>,
                       Member<ShadowTreeStyleSheetCollection>>
       StyleSheetCollectionMap;
   StyleSheetCollectionMap m_styleSheetCollectionMap;
 
   bool m_documentScopeDirty = true;
   UnorderedTreeScopeSet m_dirtyTreeScopes;
   UnorderedTreeScopeSet m_activeTreeScopes;
@@ skipping 22 matching lines @@
 
   std::unique_ptr<StyleResolverStats> m_styleResolverStats;
   unsigned m_styleForElementCount = 0;
 
   friend class StyleEngineTest;
 };
 
 }  // namespace blink
 
 #endif