CSS Parser: Handle at-rules in declaration lists

Source/core/css/parser/CSSParserImpl.h

 // Copyright 2014 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #ifndef CSSParserImpl_h
 #define CSSParserImpl_h
 
 #include "core/CSSPropertyNames.h"
 #include "core/css/CSSProperty.h"
 #include "core/css/CSSPropertySourceData.h"
@@ skipping 30 matching lines @@
     enum AllowedRulesType {
         // As per css-syntax, css-cascade and css-namespaces, @charset rules
         // must come first, followed by @import then @namespace.
         // AllowImportRules actually means we allow @import and any rules thay
         // may follow it, i.e. @namespace rules and regular rules.
         // AllowCharsetRules and AllowNamespaceRules behave similarly.
         AllowCharsetRules,
         AllowImportRules,
         AllowNamespaceRules,
         RegularRules,
-        KeyframeRules
+        KeyframeRules,
+        NoRules, // For parsing at-rules inside declaration lists
     };
 
     static bool parseValue(MutableStylePropertySet*, CSSPropertyID, const String&, bool important, const CSSParserContext&);
     static PassRefPtrWillBeRawPtr<ImmutableStylePropertySet> parseInlineStyleDeclaration(const String&, Element*);
     static bool parseDeclarationList(MutableStylePropertySet*, const String&, const CSSParserContext&);
     static PassRefPtrWillBeRawPtr<StyleRuleBase> parseRule(const String&, const CSSParserContext&, AllowedRulesType);
     static void parseStyleSheet(const String&, const CSSParserContext&, StyleSheetContents*);
 
     static PassOwnPtr<Vector<double>> parseKeyframeKeyList(const String&);
 
@@ skipping 38 matching lines @@
     WillBeHeapVector<CSSProperty, 256> m_parsedProperties;
     CSSParserContext m_context;
 
     AtomicString m_defaultNamespace;
     RawPtrWillBeMember<StyleSheetContents> m_styleSheet;
 };
 
 } // namespace blink
 
 #endif // CSSParserImpl_h