[test] lazily parse css style rules

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..02155abcfd3b3cd46947a277c2ddba9e33ee6fec 100644
--- a/third_party/WebKit/Source/core/css/parser/CSSParserImpl.h
+++ b/third_party/WebKit/Source/core/css/parser/CSSParserImpl.h
@@ -72,8 +72,11 @@ public:
     bool supportsDeclaration(CSSParserTokenRange&);
 
     static void parseDeclarationListForInspector(const String&, const CSSParserContext&, CSSParserObserver&);
+    static ImmutableStylePropertySet* parseDeclarationListForLazyStyle(CSSParserTokenRange, const CSSParserContext&);
     static void parseStyleSheetForInspector(const String&, const CSSParserContext&, StyleSheetContents*, CSSParserObserver&);
 
+    void enableLazyParsing() { m_shouldUseLazyParsing = true; }
+
 private:
     enum RuleListType {
         TopLevelRuleList,
@@ -120,6 +123,9 @@ private:
 
     // For the inspector
     CSSParserObserverWrapper* m_observerWrapper;
+
+    // Right now, just enable lazy parsing when we parse a whole sheet.
+    bool m_shouldUseLazyParsing = false;
 };
 
 } // namespace blink