memory-infra: skip IndexedDB file name in BACKGROUND dumps

content/browser/indexed_db/leveldb/leveldb_database.cc

 // Copyright (c) 2013 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 "content/browser/indexed_db/leveldb/leveldb_database.h"
 
 #include <inttypes.h>
 #include <stdint.h>
 
 #include <cerrno>
@@ skipping 463 matching lines @@
   std::string value;
   uint64_t size;
   bool res = db_->GetProperty("leveldb.approximate-memory-usage", &value);
   DCHECK(res);
   base::StringToUint64(value, &size);
 
   auto* dump = pmd->CreateAllocatorDump(base::StringPrintf(
       "leveldb/index_db/0x%" PRIXPTR, reinterpret_cast<uintptr_t>(db_.get())));
   dump->AddScalar(base::trace_event::MemoryAllocatorDump::kNameSize,
                   base::trace_event::MemoryAllocatorDump::kUnitsBytes, size);
+
+  // Dumps in BACKGROUND mode cannot have strings or edges in order to minimize
+  // trace size and instrumentation overhead.
+  if (args.level_of_detail ==
+      base::trace_event::MemoryDumpLevelOfDetail::BACKGROUND) {
+    return true;
+  }
+
   dump->AddString("file_name", "", file_name_for_tracing);
 
   // Memory is allocated from system allocator (malloc).
   pmd->AddSuballocation(dump->guid(),
                         base::trace_event::MemoryDumpManager::GetInstance()
                             ->system_allocator_pool_name());
   return true;
 }
 
 std::unique_ptr<leveldb::Iterator> LevelDBDatabase::CreateLevelDBIterator(
@@ skipping 20 matching lines @@
 void LevelDBDatabase::OnIteratorDestroyed(LevelDBIterator* iter) {
   DCHECK_GT(num_iterators_, 0u);
   --num_iterators_;
   auto it = iterator_lru_.Peek(iter);
   if (it == iterator_lru_.end())
     return;
   iterator_lru_.Erase(it);
 }
 
 }  // namespace content