Preload scan external css for @import

third_party/WebKit/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 80 matching lines @@
     if (!m_data || m_data->isEmpty() || !canUseSheet(mimeTypeCheck))
         return String();
 
     if (!m_decodedSheetText.isNull())
         return m_decodedSheetText;
 
     // Don't cache the decoded text, regenerating is cheap and it can use quite a bit of memory
     return decodedText();
 }
 
+void CSSStyleSheetResource::appendData(const char* data, size_t length)
+{
+    Resource::appendData(data, length);
+    ResourceClientWalker<StyleSheetResourceClient> w(m_clients);
+    while (StyleSheetResourceClient* c = w.next())
+        c->didAppendData(this);

[kouhei (in TOK), 2016/04/21 06:35:03]

I'd prefer if the hook is only called on the first appendData. Something like
didFirstAppendData(this)?

[Charlie Harrison, 2016/04/25 15:14:34]

Done.

+}
+
 void CSSStyleSheetResource::checkNotify()
 {
     // Decode the data to find out the encoding and keep the sheet text around during checkNotify()
     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.
@@ skipping 66 matching lines @@
 
     setDecodedSize(m_parsedStyleSheetCache->estimatedSizeInBytes());
 
     // Check if this stylesheet resource didn't conflict with
     // another resource and has indeed been added to the cache.
     if (memoryCache()->contains(this))
         m_parsedStyleSheetCache->addedToMemoryCache();
 }
 
 } // namespace blink