Do not block painting for in-body CSS

third_party/WebKit/Source/core/dom/StyleEngine.h

 /*
  * Copyright (C) 1999 Lars Knoll (knoll@kde.org)
  *           (C) 1999 Antti Koivisto (koivisto@kde.org)
  *           (C) 2001 Dirk Mueller (mueller@kde.org)
  *           (C) 2006 Alexey Proskuryakov (ap@webkit.org)
  * Copyright (C) 2004, 2005, 2006, 2007, 2008, 2009, 2010, 2012 Apple Inc. All rights reserved.
  * Copyright (C) 2008, 2009 Torch Mobile Inc. All rights reserved. (http://www.torchmobile.com/)
  * Copyright (C) 2010 Nokia Corporation and/or its subsidiary(-ies)
  * Copyright (C) 2011 Google Inc. All rights reserved.
  *
@@ skipping 80 matching lines @@
     void clearMediaQueryRuleSetStyleSheets();
     void updateStyleSheetsInImport(DocumentStyleSheetCollector& parentCollector);
     void updateActiveStyleSheets(StyleResolverUpdateMode);
 
     String preferredStylesheetSetName() const { return m_preferredStylesheetSetName; }
     String selectedStylesheetSetName() const { return m_selectedStylesheetSetName; }
     void setPreferredStylesheetSetNameIfNotSet(const String&);
     void setSelectedStylesheetSetName(const String&);
     void setHttpDefaultStyle(const String&);
 
-    void addPendingSheet();
-    void removePendingSheet(Node* styleSheetCandidateNode);
+    void addPendingSheet(bool isBeforeBody);
+    void removePendingSheet(Node* styleSheetCandidateNode, bool isBeforeBody);
 
     bool hasPendingSheets() const { return m_pendingStylesheets > 0; }
+    bool hasPendingRenderBlockingSheets() const { return m_pendingRenderBlockingStylesheets > 0; }
     bool haveStylesheetsLoaded() const { return !hasPendingSheets() || m_ignorePendingStylesheets; }
+    bool haveRenderBlockingStylesheetsLoaded() const { return !hasPendingRenderBlockingSheets() || m_ignorePendingStylesheets; }
     bool ignoringPendingStylesheets() const { return m_ignorePendingStylesheets; }
 
     unsigned maxDirectAdjacentSelectors() const { return m_maxDirectAdjacentSelectors; }
     bool usesSiblingRules() const { return m_usesSiblingRules; }
     bool usesFirstLineRules() const { return m_usesFirstLineRules; }
     bool usesWindowInactiveSelector() const { return m_usesWindowInactiveSelector; }
 
     bool usesRemUnits() const { return m_usesRemUnits; }
     void setUsesRemUnit(bool b) { m_usesRemUnits = b; }
 
@@ skipping 29 matching lines @@
 
     void removeFontFaceRules(const HeapVector<Member<const StyleRuleFontFace>>&);
     void clearFontCache();
     // updateGenericFontFamilySettings is used from WebSettingsImpl.
     void updateGenericFontFamilySettings();
 
     void didDetach();
     bool shouldClearResolver() const;
     void resolverChanged(StyleResolverUpdateMode);
 
-    CSSStyleSheet* createSheet(Element*, const String& text, TextPosition startPosition);
+    CSSStyleSheet* createSheet(Element*, const String& text, TextPosition startPosition, bool isBeforeBody);
     void removeSheet(StyleSheetContents*);
 
     void collectScopedStyleFeaturesTo(RuleFeatureSet&) const;
     void ensureFullscreenUAStyle();
 
     void platformColorsChanged();
 
     void classChangedForElement(const SpaceSplitString& changedClasses, Element&);
     void classChangedForElement(const SpaceSplitString& oldClasses, const SpaceSplitString& newClasses, Element&);
     void attributeChangedForElement(const QualifiedName& attributeName, Element&);
@@ skipping 50 matching lines @@
     bool shouldSkipInvalidationFor(const Element&) const;
 
     Member<Document> m_document;
     bool m_isMaster;
 
     // Track the number of currently loading top-level stylesheets needed for layout.
     // Sheets loaded using the @import directive are not included in this count.
     // We use this count of pending sheets to detect when we can begin attaching
     // elements and when it is safe to execute scripts.
     int m_pendingStylesheets = 0;
+    int m_pendingRenderBlockingStylesheets = 0;
 
     HeapVector<Member<CSSStyleSheet>> m_injectedAuthorStyleSheets;
 
     Member<DocumentStyleSheetCollection> m_documentStyleSheetCollection;
 
     typedef HeapHashMap<WeakMember<TreeScope>, Member<ShadowTreeStyleSheetCollection>> StyleSheetCollectionMap;
     StyleSheetCollectionMap m_styleSheetCollectionMap;
 
     bool m_documentScopeDirty = true;
     UnorderedTreeScopeSet m_dirtyTreeScopes;
@@ skipping 21 matching lines @@
 
     OwnPtr<StyleResolverStats> m_styleResolverStats;
     unsigned m_styleForElementCount = 0;
 
     friend class StyleEngineTest;
 };
 
 } // namespace blink
 
 #endif