Add hasViewportRule() flag to StyleSheetContents.

third_party/WebKit/Source/core/css/StyleRule.h

 /*
  * (C) 1999-2003 Lars Knoll (knoll@kde.org)
  * (C) 2002-2003 Dirk Mueller (mueller@kde.org)
  * Copyright (C) 2002, 2006, 2008, 2012, 2013 Apple Inc. All rights reserved.
  *
  * This library is free software; you can redistribute it and/or
  * modify it under the terms of the GNU Library General Public
  * License as published by the Free Software Foundation; either
  * version 2 of the License, or (at your option) any later version.
  *
@@ skipping 158 matching lines @@
   DECLARE_TRACE_AFTER_DISPATCH();
 
  private:
   StyleRulePage(CSSSelectorList, StylePropertySet*);
   StyleRulePage(const StyleRulePage&);
 
   Member<StylePropertySet> m_properties;  // Cannot be null.
   CSSSelectorList m_selectorList;
 };
 
-class StyleRuleGroup : public StyleRuleBase {
+class CORE_EXPORT StyleRuleGroup : public StyleRuleBase {
  public:
   const HeapVector<Member<StyleRuleBase>>& childRules() const {
     return m_childRules;
   }
 
   void wrapperInsertRule(unsigned, StyleRuleBase*);
   void wrapperRemoveRule(unsigned);
 
   DECLARE_TRACE_AFTER_DISPATCH();
 
  protected:
   StyleRuleGroup(RuleType, HeapVector<Member<StyleRuleBase>>& adoptRule);
   StyleRuleGroup(const StyleRuleGroup&);
 
  private:
   HeapVector<Member<StyleRuleBase>> m_childRules;
 };
 
-class StyleRuleMedia : public StyleRuleGroup {
+class CORE_EXPORT StyleRuleMedia : public StyleRuleGroup {
  public:
   static StyleRuleMedia* create(MediaQuerySet* media,
                                 HeapVector<Member<StyleRuleBase>>& adoptRules) {
     return new StyleRuleMedia(media, adoptRules);
   }
 
   MediaQuerySet* mediaQueries() const { return m_mediaQueries.get(); }
 
   StyleRuleMedia* copy() const { return new StyleRuleMedia(*this); }
 
@@ skipping 80 matching lines @@
 DEFINE_STYLE_RULE_TYPE_CASTS(FontFace);
 DEFINE_STYLE_RULE_TYPE_CASTS(Page);
 DEFINE_STYLE_RULE_TYPE_CASTS(Media);
 DEFINE_STYLE_RULE_TYPE_CASTS(Supports);
 DEFINE_STYLE_RULE_TYPE_CASTS(Viewport);
 DEFINE_STYLE_RULE_TYPE_CASTS(Charset);
 
 }  // namespace blink
 
 #endif  // StyleRule_h