[WIP] Add Resource::IsShareable

third_party/WebKit/Source/platform/loader/fetch/ResourceFetcher.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, 2009, 2010, 2011 Apple Inc. All
     rights reserved.
     Copyright (C) 2009 Torch Mobile Inc. http://www.torchmobile.com/
 
     This library is free software; you can redistribute it and/or
     modify it under the terms of the GNU Library General Public
@@ skipping 424 matching lines @@
   resource->SetStatus(ResourceStatus::kPending);
   resource->NotifyStartLoad();
   resource->ResponseReceived(response, nullptr);
   resource->SetDataBufferingPolicy(kBufferData);
   if (data->size())
     resource->SetResourceBuffer(data);
   resource->SetIdentifier(CreateUniqueIdentifier());
   resource->SetCacheIdentifier(cache_identifier);
   resource->Finish();
 
-  if (!substitute_data.IsValid())
+  if (!substitute_data.IsValid() && resource->IsShareable())
     GetMemoryCache()->Add(resource);
 
   return resource;
 }
 
 Resource* ResourceFetcher::ResourceForBlockedRequest(
     const FetchParameters& params,
     const ResourceFactory& factory,
     ResourceRequestBlockedReason blocked_reason) {
   Resource* resource = factory.Create(params.GetResourceRequest(),
@@ skipping 334 matching lines @@
                             << params.GetResourceRequest().Url().ElidedString();
 
   Resource* resource =
       factory.Create(params.GetResourceRequest(), params.Options(), charset);
   resource->SetLinkPreload(params.IsLinkPreload());
   if (params.IsSpeculativePreload()) {
     resource->SetPreloadDiscoveryTime(params.PreloadDiscoveryTime());
   }
   resource->SetCacheIdentifier(cache_identifier);
 
-  // - Don't add main resource to cache to prevent reuse.
-  // - Don't add the resource if its body will not be stored.
-  if (IsMainThread() && factory.GetType() != Resource::kMainResource &&
-      params.Options().data_buffering_policy != kDoNotBufferData) {
+  if (resource->IsShareable())
     GetMemoryCache()->Add(resource);
-  }
   return resource;
 }
 
 void ResourceFetcher::StorePerformanceTimingInitiatorInformation(
     Resource* resource) {
   const AtomicString& fetch_initiator = resource->Options().initiator_info.name;
   if (fetch_initiator == FetchInitiatorTypeNames::internal)
     return;
 
   bool is_main_resource = resource->GetType() == Resource::kMainResource;
@@ skipping 843 matching lines @@
   visitor->Trace(archive_);
   visitor->Trace(loaders_);
   visitor->Trace(non_blocking_loaders_);
   visitor->Trace(document_resources_);
   visitor->Trace(preloads_);
   visitor->Trace(matched_preloads_);
   visitor->Trace(resource_timing_info_map_);
 }
 
 }  // namespace blink