Port WebKit r43831 to 172....

third_party/WebKit/WebCore/loader/DocLoader.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) 2004, 2005, 2006, 2008 Apple Inc. All rights reserved.
     Copyright (C) 2009 Torch Mobile Inc. http://www.torchmobile.com/
 
     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 326 matching lines @@
     requestPreload(type, url, charset);
 }
 
 void DocLoader::checkForPendingPreloads() 
 {
     unsigned count = m_pendingPreloads.size();
     if (!count || !m_doc->body() || !m_doc->body()->renderer())
         return;
     for (unsigned i = 0; i < count; ++i) {
         PendingPreload& preload = m_pendingPreloads[i];
-        requestPreload(preload.m_type, preload.m_url, preload.m_charset);
+        // Don't request preload if the resource already loaded normally (this will result in double load if the page is being reloaded with cached results ignored).
+        if (!cachedResource(m_doc->completeURL(preload.m_url)))
+            requestPreload(preload.m_type, preload.m_url, preload.m_charset);
     }
     m_pendingPreloads.clear();
 }
 
 void DocLoader::requestPreload(CachedResource::Type type, const String& url, const String& charset)
 {
     String encoding;
     if (type == CachedResource::Script || type == CachedResource::CSSStyleSheet)
         encoding = charset.isEmpty() ? m_doc->frame()->loader()->encoding() : charset;
 
@@ skipping 72 matching lines @@
     if (scripts)
         printf("SCRIPTS: %d (%d hits, hit rate %d%%)\n", scripts, scripts - scriptMisses, (scripts - scriptMisses) * 100 / scripts);
     if (stylesheets)
         printf("STYLESHEETS: %d (%d hits, hit rate %d%%)\n", stylesheets, stylesheets - stylesheetMisses, (stylesheets - stylesheetMisses) * 100 / stylesheets);
     if (images)
         printf("IMAGES:  %d (%d hits, hit rate %d%%)\n", images, images - imageMisses, (images - imageMisses) * 100 / images);
 }
 #endif
     
 }