Add Blink support for showing image placeholders using range requests.

third_party/WebKit/Source/core/fetch/Resource.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
@@ skipping 346 matching lines @@
 
   const HeapHashCountedSet<WeakMember<ResourceClient>>& clients() const {
     return m_clients;
   }
   DataBufferingPolicy dataBufferingPolicy() const {
     return m_options.dataBufferingPolicy;
   }
 
   void setCachePolicyBypassingCache();
   void setLoFiStateOff();
+  void clearRangeRequestHeader();
 
   SharedBuffer* data() const { return m_data.get(); }
   void clearData() { m_data.clear(); }
 
   class ProhibitAddRemoveClientInScope : public AutoReset<bool> {
    public:
     ProhibitAddRemoveClientInScope(Resource* resource)
         : AutoReset(&resource->m_isAddRemoveClientProhibited, true) {}
   };
 
@@ skipping 88 matching lines @@
 };
 
 #define DEFINE_RESOURCE_TYPE_CASTS(typeName)                   \
   DEFINE_TYPE_CASTS(typeName##Resource, Resource, resource,    \
                     resource->getType() == Resource::typeName, \
                     resource.getType() == Resource::typeName);
 
 }  // namespace blink
 
 #endif