Android should be able to discard CachedResources

Source/core/loader/cache/CachedResource.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 817 matching lines @@
         
         // Should not make buffer purgeable if it has refs other than this since we don't want two copies.
         if (!m_data->hasOneRef())
             return false;
 
         m_data->createPurgeableBuffer();
         if (!m_data->hasPurgeableBuffer())
             return false;
 
         m_purgeableData = m_data->releasePurgeableBuffer();
-        m_purgeableData->setPurgePriority(purgePriority());
-        m_purgeableData->makePurgeable(true);
+        m_purgeableData->unlock();
         m_data.clear();
         return true;
     }
 
     if (!m_purgeableData)
         return true;
+
     ASSERT(!m_data);
     ASSERT(!hasClients());
 
-    if (!m_purgeableData->makePurgeable(false))
+    if (!m_purgeableData->lock())
         return false; 
 
     m_data = SharedBuffer::adoptPurgeableBuffer(m_purgeableData.release());
     return true;
 }
 
 bool CachedResource::isPurgeable() const
 {
     return m_purgeableData && m_purgeableData->isPurgeable();
 }
@@ skipping 60 matching lines @@
     info.addMember(m_proxyResource, "proxyResource");
     info.addMember(m_handlesToRevalidate, "handlesToRevalidate");
     info.addMember(m_options, "options");
     info.addMember(m_decodedDataDeletionTimer, "decodedDataDeletionTimer");
     info.ignoreMember(m_clientsAwaitingCallback);
 
     if (m_purgeableData && !m_purgeableData->wasPurged())
         info.addRawBuffer(m_purgeableData.get(), m_purgeableData->size(), "PurgeableData", "purgeableData");
 }
 }