[OBSOLETE][memory-infra] Whitelist net dump providers in field trials

net/base/sdch_manager.cc

 // Copyright (c) 2012 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "net/base/sdch_manager.h"
 
 #include <limits.h>
 
 #include <utility>
 
@@ skipping 332 matching lines @@
     for (const auto& dictionary : dictionaries_) {
       total_size += dictionary.second->data.text().size();
     }
     dump->AddScalar(base::trace_event::MemoryAllocatorDump::kNameSize,
                     base::trace_event::MemoryAllocatorDump::kUnitsBytes,
                     total_size);
     dump->AddScalar(base::trace_event::MemoryAllocatorDump::kNameObjectCount,
                     base::trace_event::MemoryAllocatorDump::kUnitsObjects,
                     total_count);
   }
+
   // Create an empty row under parent's dump so size can be attributed correctly
-  // if |this| is shared between URLRequestContexts.
-  base::trace_event::MemoryAllocatorDump* empty_row_dump =
-      pmd->CreateAllocatorDump(parent_dump_absolute_name + "/sdch_manager");
-  pmd->AddOwnershipEdge(empty_row_dump->guid(), dump->guid());
+  // if |this| is shared between URLRequestContexts. It is not required if
+  // parent details are not reported.
+  if (!parent_dump_absolute_name.empty()) {
+    base::trace_event::MemoryAllocatorDump* empty_row_dump =
+        pmd->CreateAllocatorDump(parent_dump_absolute_name + "/sdch_manager");
+    pmd->AddOwnershipEdge(empty_row_dump->guid(), dump->guid());
+  }
 }
 
 SdchProblemCode SdchManager::AddSdchDictionary(
     const std::string& dictionary_text,
     const GURL& dictionary_url,
     std::string* server_hash_p) {
   DCHECK(thread_checker_.CalledOnValidThread());
   std::string client_hash;
   std::string server_hash;
   GenerateHash(dictionary_text, &client_hash, &server_hash);
@@ skipping 159 matching lines @@
       entry_dict->SetInteger("tries", it->second.count);
     entry_dict->SetInteger("reason", it->second.reason);
     entry_list->Append(std::move(entry_dict));
   }
   value->Set("blacklisted", std::move(entry_list));
 
   return std::move(value);
 }
 
 }  // namespace net