Collect active stylesheets and and apply asynchronously.

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

Index: third_party/WebKit/Source/core/dom/DocumentStyleSheetCollector.h
diff --git a/third_party/WebKit/Source/core/dom/DocumentStyleSheetCollector.h b/third_party/WebKit/Source/core/dom/DocumentStyleSheetCollector.h
index a97fb6a951b45f4db6d72951f3b3a09327d8d5b1..baff87789be7ec623dbfdf39470097150088f8c5 100644
--- a/third_party/WebKit/Source/core/dom/DocumentStyleSheetCollector.h
+++ b/third_party/WebKit/Source/core/dom/DocumentStyleSheetCollector.h
@@ -28,13 +28,13 @@
 #define DocumentStyleSheetCollector_h
 
 #include "bindings/core/v8/TraceWrapperMember.h"
+#include "core/css/ActiveStyleSheets.h"
 #include "platform/heap/Handle.h"
 #include "wtf/HashSet.h"
 #include "wtf/Vector.h"
 
 namespace blink {
 
-class CSSStyleSheet;
 class Document;
 class StyleSheet;
 class StyleSheetCollection;
@@ -53,9 +53,7 @@ class DocumentStyleSheetCollector {
                               HeapHashSet<Member<Document>>*);
   ~DocumentStyleSheetCollector();
 
-  void appendActiveStyleSheets(
-      const HeapVector<TraceWrapperMember<CSSStyleSheet>>&);
-  void appendActiveStyleSheet(CSSStyleSheet*);
+  void appendActiveStyleSheet(const ActiveStyleSheet&);
   void appendSheetForList(StyleSheet*);
 
   bool hasVisited(Document* document) const {