[WIP] Add Resource::IsShareable

third_party/WebKit/Source/platform/loader/fetch/MemoryCache.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, 2007, 2008 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.
@@ skipping 114 matching lines @@
   if (!resource_maps_.Contains(cache_identifier)) {
     ResourceMapIndex::AddResult result =
         resource_maps_.insert(cache_identifier, new ResourceMap);
     CHECK(result.is_new_entry);
   }
   return resource_maps_.at(cache_identifier);
 }
 
 void MemoryCache::Add(Resource* resource) {
   DCHECK(resource);
+  DCHECK(resource->IsShareable());
+
   ResourceMap* resources = EnsureResourceMap(resource->CacheIdentifier());
   AddInternal(resources, MemoryCacheEntry::Create(resource));
   RESOURCE_LOADING_DVLOG(1)
       << "MemoryCache::add Added " << resource->Url().GetString()
       << ", resource " << resource;
 }
 
 void MemoryCache::AddInternal(ResourceMap* resource_map,
                               MemoryCacheEntry* entry) {
   DCHECK(WTF::IsMainThread());
@@ skipping 316 matching lines @@
     }
   }
   return true;
 }
 
 void MemoryCache::OnMemoryPressure(WebMemoryPressureLevel level) {
   PruneAll();
 }
 
 }  // namespace blink