Prefetch @import files from CSS files.

Source/core/fetch/CSSStyleSheetResource.cpp

 /*
     Copyright (C) 1998 Lars Knoll (knoll@mpi-hd.mpg.de)
     Copyright (C) 2001 Dirk Mueller (mueller@kde.org)
     Copyright (C) 2002 Waldo Bastian (bastian@kde.org)
     Copyright (C) 2006 Samuel Weinig (sam.weinig@gmail.com)
     Copyright (C) 2004, 2005, 2006 Apple Computer, Inc.
 
     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
@@ skipping 91 matching lines @@
     if (m_data)
         m_decodedSheetText = decodedText();
 
     ResourceClientWalker<StyleSheetResourceClient> w(m_clients);
     while (StyleSheetResourceClient* c = w.next())
         c->setCSSStyleSheet(m_resourceRequest.url(), m_response.url(), encoding(), this);
     // Clear the decoded text as it is unlikely to be needed immediately again and is cheap to regenerate.
     m_decodedSheetText = String();
 }
 
+void CSSStyleSheetResource::appendData(const char* data, unsigned length)
+{
+    Resource::appendData(data, length);
+
+    ResourcePtr<CSSStyleSheetResource> protect(this);
+    ResourceClientWalker<StyleSheetResourceClient> walker(m_clients);
+    while (StyleSheetResourceClient* client = walker.next())
+        client->dataReceived(this);
+}
+
 bool CSSStyleSheetResource::isSafeToUnlock() const
 {
     return m_data->hasOneRef();
 }
 
 void CSSStyleSheetResource::destroyDecodedDataIfPossible()
 {
     if (!m_parsedStyleSheetCache)
         return;
 
@@ skipping 54 matching lines @@
 
     if (m_parsedStyleSheetCache)
         m_parsedStyleSheetCache->removedFromMemoryCache();
     m_parsedStyleSheetCache = sheet;
     m_parsedStyleSheetCache->addedToMemoryCache();
 
     setDecodedSize(m_parsedStyleSheetCache->estimatedSizeInBytes());
 }
 
 }