Collect active stylesheets and and apply asynchronously.

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

Index: third_party/WebKit/Source/core/dom/TreeScopeStyleSheetCollection.h
diff --git a/third_party/WebKit/Source/core/dom/TreeScopeStyleSheetCollection.h b/third_party/WebKit/Source/core/dom/TreeScopeStyleSheetCollection.h
index 40fdf9e62dddc71a75ea080fe552e12765f4f0da..1d05a18a5d6a158c74d1be67d9d20e803c7f1849 100644
--- a/third_party/WebKit/Source/core/dom/TreeScopeStyleSheetCollection.h
+++ b/third_party/WebKit/Source/core/dom/TreeScopeStyleSheetCollection.h
@@ -31,20 +31,14 @@
 #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:
@@ -56,7 +50,7 @@ class CORE_EXPORT TreeScopeStyleSheetCollection : public StyleSheetCollection {
     return !m_styleSheetCandidateNodes.isEmpty();
   }
 
-  void clearMediaQueryRuleSetStyleSheets();
+  bool mediaQueryAffectingValueChanged();
 
   virtual bool isShadowTreeStyleSheetCollection() const { return false; }
 
@@ -68,39 +62,13 @@ class CORE_EXPORT TreeScopeStyleSheetCollection : public StyleSheetCollection {
   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