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

components/leveldb/leveldb_service_impl.cc

 // Copyright 2016 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/leveldb_service_impl.h"
 
 #include <memory>
 
 #include "base/memory/ptr_util.h"
 #include "components/leveldb/env_mojo.h"
@@ skipping 41 matching lines @@
   options.compression = leveldb::kSnappyCompression;
 
   // Register our directory with the file thread.
   LevelDBMojoProxy::OpaqueDir* dir =
       thread_->RegisterDirectory(std::move(directory));
 
   std::unique_ptr<MojoEnv> env_mojo(new MojoEnv(thread_, dir));
   options.env = env_mojo.get();
 
   leveldb::DB* db = nullptr;
-  leveldb::Status s = leveldb::DB::Open(options, dbname, &db);
+  leveldb::Status s = leveldb_env::DBRegistry::Open(options, dbname, &db);
 
   if (s.ok()) {
     mojo::MakeStrongAssociatedBinding(
         base::MakeUnique<LevelDBDatabaseImpl>(std::move(env_mojo),
                                               base::WrapUnique(db)),
         std::move(database));
   }
 
   callback.Run(LeveldbStatusToError(s));
 }
 
 void LevelDBServiceImpl::OpenInMemory(
     leveldb::mojom::LevelDBDatabaseAssociatedRequest database,
     const OpenCallback& callback) {
   leveldb::Options options;
   options.create_if_missing = true;
   options.max_open_files = 0;  // Use minimum.
 
   std::unique_ptr<leveldb::Env> env(
       leveldb::NewMemEnv(leveldb::Env::Default()));
   options.env = env.get();
 
   leveldb::DB* db = nullptr;
-  leveldb::Status s = leveldb::DB::Open(options, "", &db);
+  leveldb::Status s = leveldb_env::DBRegistry::Open(options, "", &db);
 
   if (s.ok()) {
     mojo::MakeStrongAssociatedBinding(base::MakeUnique<LevelDBDatabaseImpl>(
                                           std::move(env), base::WrapUnique(db)),
                                       std::move(database));
   }
 
   callback.Run(LeveldbStatusToError(s));
 }
 
 void LevelDBServiceImpl::Destroy(filesystem::mojom::DirectoryPtr directory,
                                  const std::string& dbname,
                                  const DestroyCallback& callback) {
   leveldb::Options options;
   // Register our directory with the file thread.
   LevelDBMojoProxy::OpaqueDir* dir =
       thread_->RegisterDirectory(std::move(directory));
   std::unique_ptr<MojoEnv> env_mojo(new MojoEnv(thread_, dir));
   options.env = env_mojo.get();
   callback.Run(LeveldbStatusToError(leveldb::DestroyDB(dbname, options)));
 }
 
 }  // namespace leveldb