Prepare to add more initiator info to CachedResource(Request)

Source/core/loader/cache/CachedResource.h

 /*
     Copyright (C) 1998 Lars Knoll (knoll@mpi-hd.mpg.de)
     Copyright (C) 2001 Dirk Mueller <mueller@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
     version 2 of the License, or (at your option) any later version.
 
     This library is distributed in the hope that it will be useful,
     but WITHOUT ANY WARRANTY; without even the implied warranty of
     MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
     Library General Public License for more details.
 
     You should have received a copy of the GNU Library General Public License
     along with this library; see the file COPYING.LIB.  If not, write to
     the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
     Boston, MA 02110-1301, USA.
 */
 
 #ifndef CachedResource_h
 #define CachedResource_h
 
 #include <time.h>
 #include "core/loader/FrameLoaderTypes.h"
 #include "core/loader/ResourceLoaderOptions.h"
 #include "core/loader/cache/CachePolicy.h"
+#include "core/loader/cache/CachedResourceInitiatorInfo.h"
 #include "core/platform/PurgePriority.h"
 #include "core/platform/Timer.h"
 #include "core/platform/network/ResourceError.h"
 #include "core/platform/network/ResourceLoadPriority.h"
 #include "core/platform/network/ResourceRequest.h"
 #include "core/platform/network/ResourceResponse.h"
 #include <wtf/HashCountedSet.h>
 #include <wtf/HashSet.h>
 #include <wtf/OwnPtr.h>
 #include <wtf/text/WTFString.h>
@@ skipping 203 matching lines @@
     virtual void didSendData(unsigned long long /* bytesSent */, unsigned long long /* totalBytesToBeSent */) { }
     virtual void didDownloadData(int) { }
 
     void setLoadFinishTime(double finishTime) { m_loadFinishTime = finishTime; }
     double loadFinishTime() const { return m_loadFinishTime; }
 
     virtual void reportMemoryUsage(MemoryObjectInfo*) const;
 
     virtual bool canReuse(const ResourceRequest&) const { return true; }
 
+    const CachedResourceInitiatorInfo& initiatorInfo() const { return m_initiatorInfo; }
+    void setInitiatorInfo(const CachedResourceInitiatorInfo& initiatorInfo) { m_initiatorInfo = initiatorInfo; }

[Nate Chapin, 2013/05/15 22:14:58]

What is the rationale for moving this here from CachedResourceLoader? Not
opposed, just want to make sure I understand.

[abarth-chromium, 2013/05/15 22:21:25]

Previously CachedResourceLoader kept a HashMap keyed off CachedResource.  Given
that all CachedResources are initiated by something, that meant we had a HashMap
entry for all of them.  It's more efficient and more sensible to just store the
information in the CachedResource itself instead of in a look-aside HashMap.

+
 protected:
     virtual void checkNotify();
     virtual void finishOnePart();
 
     void setEncodedSize(unsigned);
     void setDecodedSize(unsigned);
     void didAccessDecodedData(double timeStamp);
 
     bool isSafeToMakePurgeable() const;
     
@@ skipping 84 matching lines @@
     // using HTTP If-Modified-Since/If-None-Match headers. If the response is 304 all clients of this resource are moved
     // to to be clients of m_resourceToRevalidate and the resource is deleted. If not, the field is zeroed and this
     // resources becomes normal resource load.
     CachedResource* m_resourceToRevalidate;
 
     // If this field is non-null, the resource has a proxy for checking whether it is still up to date (see m_resourceToRevalidate).
     CachedResource* m_proxyResource;
 
     // These handles will need to be updated to point to the m_resourceToRevalidate in case we get 304 response.
     HashSet<CachedResourceHandleBase*> m_handlesToRevalidate;
+
+    CachedResourceInitiatorInfo m_initiatorInfo;
 };
 
 }
 
 #endif