Update styleSheets list in import without active style update.

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 325 matching lines @@
   void InvalidateSlottedElements(HTMLSlotElement&);
 
   void UpdateViewport();
   void UpdateActiveStyleSheets();
   void UpdateGlobalRuleSet() {
     DCHECK(!NeedsActiveStyleSheetUpdate());
     if (global_rule_set_)
       global_rule_set_->Update(GetDocument());
   }
   const MediaQueryEvaluator& EnsureMediaQueryEvaluator();
+  void UpdateStyleSheetList(TreeScope&);
 
   Member<Document> document_;
   bool is_master_;
 
   // 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 pending_script_blocking_stylesheets_ = 0;
   int pending_render_blocking_stylesheets_ = 0;
@@ skipping 40 matching lines @@
 
   std::unique_ptr<StyleResolverStats> style_resolver_stats_;
   unsigned style_for_element_count_ = 0;
 
   friend class StyleEngineTest;
 };
 
 }  // namespace blink
 
 #endif