leveldb: Add DBTracker for exposing databases to Chrome's memory-infra.

components/leveldb_proto/leveldb_database.cc

 // Copyright 2014 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 "components/leveldb_proto/leveldb_database.h"
 
 #include <inttypes.h>
 
 #include <string>
 #include <vector>
@@ skipping 44 matching lines @@
       this);
 }
 
 bool LevelDB::InitWithOptions(const base::FilePath& database_dir,
                               const leveldb::Options& options) {
   DFAKE_SCOPED_LOCK(thread_checker_);
 
   std::string path = database_dir.AsUTF8Unsafe();
 
   leveldb::DB* db = NULL;
-  leveldb::Status status = leveldb::DB::Open(options, path, &db);
+  leveldb::Status status = leveldb_env::DBRegistry::Open(options, path, &db);
   if (open_histogram_)
     open_histogram_->Add(leveldb_env::GetLevelDBStatusUMAValue(status));
   if (status.IsCorruption()) {
     base::DeleteFile(database_dir, true);
-    status = leveldb::DB::Open(options, path, &db);
+    status = leveldb_env::DBRegistry::Open(options, path, &db);
   }
 
   if (status.ok()) {
     CHECK(db);
     db_.reset(db);
 
     base::trace_event::MemoryDumpManager::GetInstance()
         ->RegisterDumpProviderWithSequencedTaskRunner(
             this, "LevelDB", base::SequencedTaskRunnerHandle::Get(),
             base::trace_event::MemoryDumpProvider::Options());
@@ skipping 128 matching lines @@
   const char* system_allocator_pool_name =
       base::trace_event::MemoryDumpManager::GetInstance()
           ->system_allocator_pool_name();
   if (system_allocator_pool_name)
     pmd->AddSuballocation(dump->guid(), system_allocator_pool_name);
 
   return true;
 }
 
 }  // namespace leveldb_proto