Lazy Parse CSS

third_party/WebKit/Source/core/css/StyleSheetContents.cpp

Index: third_party/WebKit/Source/core/css/StyleSheetContents.cpp
diff --git a/third_party/WebKit/Source/core/css/StyleSheetContents.cpp b/third_party/WebKit/Source/core/css/StyleSheetContents.cpp
index 9ad890082c3cc4b20fc52366b5317ba5fd16ad06..93123fb8fddb5cd54c98db6c00adf95bf45937d3 100644
--- a/third_party/WebKit/Source/core/css/StyleSheetContents.cpp
+++ b/third_party/WebKit/Source/core/css/StyleSheetContents.cpp
@@ -86,6 +86,8 @@ StyleSheetContents::StyleSheetContents(const StyleSheetContents& o)
     , m_hasSingleOwnerDocument(true)
     , m_isUsedFromTextCache(false)
     , m_parserContext(o.m_parserContext)
+    , m_escapedStrings(o.m_escapedStrings ? new Vector<String>(*o.m_escapedStrings) : nullptr)
+    , m_sheetText(o.m_sheetText)
 {
     // FIXME: Copy import rules.
     ASSERT(o.m_importRules.isEmpty());
@@ -333,6 +335,8 @@ void StyleSheetContents::parseAuthorStyleSheet(const CSSStyleSheetResource* cach
 
     CSSStyleSheetResource::MIMETypeCheck mimeTypeCheck = isQuirksModeBehavior(m_parserContext.mode()) && isSameOriginRequest ? CSSStyleSheetResource::MIMETypeCheck::Lax : CSSStyleSheetResource::MIMETypeCheck::Strict;
     String sheetText = cachedStyleSheet->sheetText(mimeTypeCheck);
+    if (RuntimeEnabledFeatures::lazyParseCSSEnabled())
+        m_sheetText = sheetText;
 
     const ResourceResponse& response = cachedStyleSheet->response();
     m_sourceMapURL = response.httpHeaderField(HTTPNames::SourceMap);
@@ -342,7 +346,7 @@ void StyleSheetContents::parseAuthorStyleSheet(const CSSStyleSheetResource* cach
     }
 
     CSSParserContext context(parserContext(), UseCounter::getFrom(this));
-    CSSParser::parseSheet(context, this, sheetText);
+    CSSParser::parseSheet(context, this, sheetText, RuntimeEnabledFeatures::lazyParseCSSEnabled());
 }
 
 void StyleSheetContents::parseString(const String& sheetText)
@@ -474,7 +478,7 @@ static bool childRulesHaveFailedOrCanceledSubresources(const HeapVector<Member<S
         const StyleRuleBase* rule = rules[i].get();
         switch (rule->type()) {
         case StyleRuleBase::Style:
-            if (toStyleRule(rule)->properties().hasFailedOrCanceledSubresources())
+            if (toStyleRule(rule)->propertiesHaveFailedOrCanceledSubresources())
                 return true;
             break;
         case StyleRuleBase::FontFace: