Lazy Parse CSS

third_party/WebKit/Source/core/css/parser/CSSParserImpl.h

Index: third_party/WebKit/Source/core/css/parser/CSSParserImpl.h
diff --git a/third_party/WebKit/Source/core/css/parser/CSSParserImpl.h b/third_party/WebKit/Source/core/css/parser/CSSParserImpl.h
index 0bcd5153417d9830ee91dc5970255cdc3d5f1f2f..ec044025094c5f0e0fdd2d94b1db9d798d8ff82d 100644
--- a/third_party/WebKit/Source/core/css/parser/CSSParserImpl.h
+++ b/third_party/WebKit/Source/core/css/parser/CSSParserImpl.h
@@ -40,7 +40,7 @@ class CSSParserImpl {
     STACK_ALLOCATED();
     WTF_MAKE_NONCOPYABLE(CSSParserImpl);
 public:
-    CSSParserImpl(const CSSParserContext&, StyleSheetContents* = nullptr);
+    CSSParserImpl(const CSSParserContext&, StyleSheetContents* = nullptr, bool deferPropertyParsing = false);
 
     enum AllowedRulesType {
         // As per css-syntax, css-cascade and css-namespaces, @charset rules
@@ -62,7 +62,7 @@ public:
     static ImmutableStylePropertySet* parseInlineStyleDeclaration(const String&, Element*);
     static bool parseDeclarationList(MutableStylePropertySet*, const String&, const CSSParserContext&);
     static StyleRuleBase* parseRule(const String&, const CSSParserContext&, StyleSheetContents*, AllowedRulesType);
-    static void parseStyleSheet(const String&, const CSSParserContext&, StyleSheetContents*);
+    static void parseStyleSheet(const String&, const CSSParserContext&, StyleSheetContents*, bool deferPropertyParsing = false);
     static CSSSelectorList parsePageSelector(CSSParserTokenRange, StyleSheetContents*);
 
     static ImmutableStylePropertySet* parseCustomPropertySet(CSSParserTokenRange);
@@ -111,6 +111,12 @@ private:
 
     static std::unique_ptr<Vector<double>> consumeKeyframeKeyList(CSSParserTokenRange);
 
+    static std::unique_ptr<DeferredPropertiesClosure> createDeferredPropertiesClosure(CSSParserTokenRange, const CSSParserContext&, UseCounter*);
+
+    static StylePropertySet* parseDeclarationListForLazyStyle(Vector<CSSParserToken>, const CSSParserContext*, UseCounter*);
+
+    static bool shouldLazilyParseProperties(const CSSSelectorList& selectors, CSSParserTokenRange);
+
     // FIXME: Can we build StylePropertySets directly?
     // FIXME: Investigate using a smaller inline buffer
     HeapVector<CSSProperty, 256> m_parsedProperties;
@@ -120,6 +126,8 @@ private:
 
     // For the inspector
     CSSParserObserverWrapper* m_observerWrapper;
+
+    bool m_deferPropertyParsing = false;
 };
 
 } // namespace blink