Fix lifetime of leveldb::MojoEnv instances.

components/leveldb/leveldb_app.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_app.h"
 
+#include "base/debug/leak_annotations.h"
+#include "components/leveldb/env_mojo.h"
 #include "components/leveldb/leveldb_service_impl.h"
 #include "services/service_manager/public/cpp/service_context.h"
 
 namespace leveldb {
 
-LevelDBApp::LevelDBApp() : file_thread_("LevelDBFile") {
+LevelDBApp::LevelDBApp()
+    : file_thread_("LevelDBFile"),
+      env_(nullptr) {
   registry_.AddInterface<mojom::LevelDBService>(this);
 }
 
 LevelDBApp::~LevelDBApp() {}
 
 void LevelDBApp::OnStart() {
   tracing_.Initialize(context()->connector(), context()->identity().name());
 }
 
 void LevelDBApp::OnBindInterface(
     const service_manager::ServiceInfo& source_info,
     const std::string& interface_name,
     mojo::ScopedMessagePipeHandle interface_pipe) {
   registry_.BindInterface(source_info.identity, interface_name,
                           std::move(interface_pipe));
 }
 
 void LevelDBApp::Create(const service_manager::Identity& remote_identity,
                         leveldb::mojom::LevelDBServiceRequest request) {
   if (!service_) {
     if (!file_thread_.IsRunning())
       file_thread_.Start();
-    service_.reset(
-        new LevelDBServiceImpl(file_thread_.message_loop()->task_runner()));
+    if (!env_) {
+      env_ = new MojoEnv(file_thread_.message_loop()->task_runner());
+      ANNOTATE_LEAKING_OBJECT_PTR(env_);
+    }
+    service_.reset(new LevelDBServiceImpl(env_));
   }
   bindings_.AddBinding(service_.get(), std::move(request));
 }
 
 }  // namespace leveldb