Prefetch @import files from CSS files.

Source/core/html/HTMLLinkElement.h

 /*
  * Copyright (C) 1999 Lars Knoll (knoll@kde.org)
  *           (C) 1999 Antti Koivisto (koivisto@kde.org)
  * Copyright (C) 2003, 2008, 2010 Apple Inc. All rights reserved.
  * Copyright (C) 2011 Google 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.
@@ skipping 15 matching lines @@
 
 #include "core/css/CSSStyleSheet.h"
 #include "core/dom/DOMSettableTokenList.h"
 #include "core/dom/IconURL.h"
 #include "core/fetch/ResourceOwner.h"
 #include "core/fetch/StyleSheetResource.h"
 #include "core/fetch/StyleSheetResourceClient.h"
 #include "core/html/HTMLElement.h"
 #include "core/html/LinkRelAttribute.h"
 #include "core/html/LinkResource.h"
+#include "core/html/parser/BackgroundHTMLInputStream.h"
+#include "core/html/parser/CSSPreloadScanner.h"
+#include "core/html/parser/HTMLParserOptions.h"
+#include "core/html/parser/HTMLTokenizer.h"
 #include "core/loader/LinkLoader.h"
 #include "core/loader/LinkLoaderClient.h"
 
 namespace blink {
 
 class HTMLLinkElement;
 class KURL;
 class LinkImport;
 
 template<typename T> class EventSender;
@@ skipping 33 matching lines @@
     bool hasSheet() const { return m_sheet; }
     bool isDisabled() const { return m_disabledState == Disabled; }
     bool isEnabledViaScript() const { return m_disabledState == EnabledViaScript; }
     bool isUnset() const { return m_disabledState == Unset; }
 
     CSSStyleSheet* sheet() const { return m_sheet.get(); }
 
 private:
     // From StyleSheetResourceClient
     virtual void setCSSStyleSheet(const String& href, const KURL& baseURL, const String& charset, const CSSStyleSheetResource*) override;
+    virtual void dataReceived(const CSSStyleSheetResource* cachedStyleSheet) override;
 
     enum DisabledState {
         Unset,
         EnabledViaScript,
         Disabled
     };
 
     enum PendingSheetType {
         None,
         NonBlocking,
         Blocking
     };
 
     void clearSheet();
     void addPendingSheet(PendingSheetType);
     void removePendingSheet();
     Document& document();
 
     RefPtrWillBeMember<CSSStyleSheet> m_sheet;
+    BackgroundHTMLInputStream m_input;
+    OwnPtr<HTMLToken> m_token;
+    HTMLParserOptions m_options;
+    OwnPtr<HTMLTokenizer> m_tokenizer;
+    OwnPtr<CSSPreloadScanner> m_preloadScanner;
+    unsigned m_preloadLength;
     DisabledState m_disabledState;
     PendingSheetType m_pendingSheetType;
     bool m_loading;
     bool m_firedLoad;
     bool m_loadedSheet;
 };
 
 
 class HTMLLinkElement final : public HTMLElement, public LinkLoaderClient {
     DEFINE_WRAPPERTYPEINFO();
@@ skipping 90 matching lines @@
     Vector<IntSize> m_iconSizes;
     LinkRelAttribute m_relAttribute;
 
     bool m_createdByParser;
     bool m_isInShadowTree;
 };
 
 } // namespace blink
 
 #endif // HTMLLinkElement_h