Do not block painting for in-body CSS

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

 /*
  * Copyright (C) 2000 Peter Kelly (pmk@post.com)
  * Copyright (C) 2006 Apple Inc. All rights reserved.
  *
  * This library is free software; you can redistribute it and/or
  * modify it under the terms of the GNU Library General Public
  * License as published by the Free Software Foundation; either
  * version 2 of the License, or (at your option) any later version.
  *
  * This library is distributed in the hope that it will be useful,
  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  * Library General Public License for more details.
  *
  * You should have received a copy of the GNU Library General Public License
  * along with this library; see the file COPYING.LIB.  If not, write to
  * the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
  * Boston, MA 02110-1301, USA.
  *
  */
 
 #ifndef ProcessingInstruction_h
 #define ProcessingInstruction_h
 
 #include "core/dom/CharacterData.h"
+#include "core/dom/StyleEngineContext.h"
 #include "core/fetch/ResourceOwner.h"
 #include "core/fetch/StyleSheetResource.h"
 #include "core/fetch/StyleSheetResourceClient.h"
 
 namespace blink {
 
 class StyleSheet;
 class CSSStyleSheet;
 class EventListener;
 
@@ skipping 51 matching lines @@
     void parseStyleSheet(const String& sheet);
     void clearSheet();
 
     String debugName() const override { return "ProcessingInstruction"; }
 
     String m_target;
     String m_localHref;
     String m_title;
     String m_media;
     Member<StyleSheet> m_sheet;
+    StyleEngineContext m_styleEngineContext;
     bool m_loading;
     bool m_alternate;
     bool m_isCSS;
     bool m_isXSL;
 
     Member<DetachableEventListener> m_listenerForXSLT;
 };
 
 DEFINE_NODE_TYPE_CASTS(ProcessingInstruction, getNodeType() == Node::PROCESSING_INSTRUCTION_NODE);
 
 inline bool isXSLStyleSheet(const Node& node)
 {
     return node.getNodeType() == Node::PROCESSING_INSTRUCTION_NODE && toProcessingInstruction(node).isXSL();
 }
 
 } // namespace blink
 
 #endif // ProcessingInstruction_h