Implement Blink-side changes to enable V8 code caching.

Source/core/fetch/Resource.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, 2007, 2008, 2009, 2010, 2011 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
@@ skipping 403 matching lines @@
     // Currently, only one type of cached metadata per resource is supported.
     // If the need arises for multiple types of metadata per resource this could
     // be enhanced to store types of metadata in a map.
     ASSERT(!m_cachedMetadata);
 
     m_cachedMetadata = CachedMetadata::create(dataTypeID, data, size);
     const Vector<char>& serializedData = m_cachedMetadata->serialize();
     blink::Platform::current()->cacheMetadata(m_response.url(), m_response.responseTime(), serializedData.data(), serializedData.size());
 }
 
+void Resource::clearCachedMetadata()
+{
+    m_cachedMetadata.clear();

[jochen (gone - plz use gerrit), 2014/08/04 09:27:29]

have you verified that this works across reloads, or will we get both, the old
and the new meta data back from the disk cache?

[vogelheim, 2014/08/05 16:03:36]

Not yet. :) Will do before proceeding with the CL.

+}
+
 bool Resource::canDelete() const
 {
     return !hasClients() && !m_loader && !m_preloadCount && hasRightHandleCountApartFromCache(0)
         && !m_protectorCount && !m_resourceToRevalidate && !m_proxyResource;
 }
 
 bool Resource::hasOneHandle() const
 {
     return hasRightHandleCountApartFromCache(1);
 }
@@ skipping 571 matching lines @@
         return "ImportResource";
     case Resource::Media:
         return "Media";
     }
     ASSERT_NOT_REACHED();
     return "Unknown";
 }
 #endif // !LOG_DISABLED
 
 }