Make CSSParserContext be garbage collected.

third_party/WebKit/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 23 matching lines @@
 class StyleRuleSupports;
 class StyleRuleViewport;
 class StyleSheetContents;
 class Element;
 
 class CSSParserImpl {
   STACK_ALLOCATED();
   WTF_MAKE_NONCOPYABLE(CSSParserImpl);
 
  public:
-  CSSParserImpl(const CSSParserContext&, StyleSheetContents* = nullptr);
+  CSSParserImpl(const CSSParserContext*, StyleSheetContents* = nullptr);
 
   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,
     ApplyRules,  // For @apply inside style rules
     NoRules,     // For parsing at-rules inside declaration lists
   };
 
   static MutableStylePropertySet::SetResult parseValue(MutableStylePropertySet*,
                                                        CSSPropertyID,
                                                        const String&,
                                                        bool important,
-                                                       const CSSParserContext&);
+                                                       const CSSParserContext*);
   static MutableStylePropertySet::SetResult parseVariableValue(
       MutableStylePropertySet*,
       const AtomicString& propertyName,
       const PropertyRegistry*,
       const String&,
       bool important,
-      const CSSParserContext&,
+      const CSSParserContext*,
       bool isAnimationTainted);
   static ImmutableStylePropertySet* parseInlineStyleDeclaration(const String&,
                                                                 Element*);
   static bool parseDeclarationList(MutableStylePropertySet*,
                                    const String&,
-                                   const CSSParserContext&);
+                                   const CSSParserContext*);
   static StyleRuleBase* parseRule(const String&,
-                                  const CSSParserContext&,
+                                  const CSSParserContext*,
                                   StyleSheetContents*,
                                   AllowedRulesType);
   static void parseStyleSheet(const String&,
-                              const CSSParserContext&,
+                              const CSSParserContext*,
                               StyleSheetContents*,
                               bool deferPropertyParsing = false);
   static CSSSelectorList parsePageSelector(CSSParserTokenRange,
                                            StyleSheetContents*);
 
   static ImmutableStylePropertySet* parseCustomPropertySet(CSSParserTokenRange);
 
   static std::unique_ptr<Vector<double>> parseKeyframeKeyList(const String&);
 
   bool supportsDeclaration(CSSParserTokenRange&);
 
   static void parseDeclarationListForInspector(const String&,
-                                               const CSSParserContext&,
+                                               const CSSParserContext*,
                                                CSSParserObserver&);
   static void parseStyleSheetForInspector(const String&,
-                                          const CSSParserContext&,
+                                          const CSSParserContext*,
                                           StyleSheetContents*,
                                           CSSParserObserver&);
 
   static StylePropertySet* parseDeclarationListForLazyStyle(
       CSSParserTokenRange block,
-      const CSSParserContext&);
+      const CSSParserContext*);
 
  private:
   enum RuleListType { TopLevelRuleList, RegularRuleList, KeyframesRuleList };
 
   // Returns whether the first encountered rule was valid
   template <typename T>
   bool consumeRuleList(CSSParserTokenRange, RuleListType, T callback);
 
   // These two functions update the range they're given
   StyleRuleBase* consumeAtRule(CSSParserTokenRange&, AllowedRulesType);
@@ skipping 33 matching lines @@
                             const AtomicString& propertyName,
                             bool important,
                             bool isAnimationTainted);
 
   static std::unique_ptr<Vector<double>> consumeKeyframeKeyList(
       CSSParserTokenRange);
 
   // FIXME: Can we build StylePropertySets directly?
   // FIXME: Investigate using a smaller inline buffer
   HeapVector<CSSProperty, 256> m_parsedProperties;
-  const CSSParserContext& m_context;
 
+  Member<const CSSParserContext> m_context;
   Member<StyleSheetContents> m_styleSheet;
 
   // For the inspector
   CSSParserObserverWrapper* m_observerWrapper;
 
   Member<CSSLazyParsingState> m_lazyState;
 };
 
 }  // namespace blink
 
 #endif  // CSSParserImpl_h