CSS Parser: Mark on stylesheets whether the first rule was valid

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 21 matching lines @@
 class CSSRule;
 class CSSStyleSheet;
 class MutableStylePropertySet;
 class StylePropertySet;
 
 class StyleRuleBase : public RefCountedWillBeGarbageCollectedFinalized<StyleRuleBase> {
     WTF_MAKE_FAST_ALLOCATED_WILL_BE_REMOVED;
 public:
     enum Type {
         Unknown,
+        Charset,
         Style,
         Import,
         Media,
         FontFace,
         Page,
         Keyframes,
         Keyframe,
         Namespace,
         Supports,
         Viewport,
     };
 
     Type type() const { return static_cast<Type>(m_type); }
 
+    bool isCharsetRule() const { return type() == Charset; }
     bool isFontFaceRule() const { return type() == FontFace; }
     bool isKeyframesRule() const { return type() == Keyframes; }
     bool isKeyframeRule() const { return type() == Keyframe; }
     bool isNamespaceRule() const { return type() == Namespace; }
     bool isMediaRule() const { return type() == Media; }
     bool isPageRule() const { return type() == Page; }
     bool isStyleRule() const { return type() == Style; }
     bool isSupportsRule() const { return type() == Supports; }
     bool isViewportRule() const { return type() == Viewport; }
     bool isImportRule() const { return type() == Import; }
@@ skipping 180 matching lines @@
 
     DECLARE_TRACE_AFTER_DISPATCH();
 
 private:
     StyleRuleViewport();
     StyleRuleViewport(const StyleRuleViewport&);
 
     RefPtrWillBeMember<StylePropertySet> m_properties; // Cannot be null
 };
 
+// This should only be used within the CSS Parser
+class StyleRuleCharset : public StyleRuleBase {
+    WTF_MAKE_FAST_ALLOCATED_WILL_BE_REMOVED;
+public:
+    static PassRefPtrWillBeRawPtr<StyleRuleCharset> create() { return adoptRefWillBeNoop(new StyleRuleCharset()); }
+    DEFINE_INLINE_TRACE_AFTER_DISPATCH() { StyleRuleBase::traceAfterDispatch(visitor); };
+
+private:
+    StyleRuleCharset() : StyleRuleBase(Charset) { }
+};
+
+
 #define DEFINE_STYLE_RULE_TYPE_CASTS(Type) \
     DEFINE_TYPE_CASTS(StyleRule##Type, StyleRuleBase, rule, rule->is##Type##Rule(), rule.is##Type##Rule())
 
 DEFINE_TYPE_CASTS(StyleRule, StyleRuleBase, rule, rule->isStyleRule(), rule.isStyleRule());
 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