mojo leveldb: Get profile and leveldb connected to DOMStorageContext.

components/filesystem/file_system_impl.cc

 // Copyright 2015 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/filesystem/file_system_impl.h"
 
 #include <stddef.h>
 #include <utility>
 
 #include "base/files/file_path.h"
 #include "base/files/file_util.h"
 #include "base/files/scoped_file.h"
 #include "base/files/scoped_temp_dir.h"
 #include "base/logging.h"
 #include "base/memory/scoped_ptr.h"
 #include "build/build_config.h"
 #include "components/filesystem/directory_impl.h"
 #include "mojo/shell/public/cpp/connection.h"
 #include "url/gurl.h"
 
 namespace filesystem {
 
 FileSystemImpl::FileSystemImpl(mojo::Connection* connection,
                                mojo::InterfaceRequest<FileSystem> request,
-                               base::FilePath persistent_dir,
+                               const base::FilePath& persistent_dir,
                                LockTable* lock_table)
     : remote_application_url_(connection->GetRemoteApplicationURL()),

[michaeln, 2016/02/26 21:59:24]

what is this?

       binding_(this, std::move(request)),
       lock_table_(lock_table),
-      persistent_dir_(persistent_dir) {}
+      persistent_dir_(persistent_dir) {
+}
 
-FileSystemImpl::~FileSystemImpl() {
-}
+FileSystemImpl::~FileSystemImpl() {}
 
 void FileSystemImpl::OpenTempDirectory(
     mojo::InterfaceRequest<Directory> directory,
     const OpenTempDirectoryCallback& callback) {
   // Set only if the |DirectoryImpl| will own a temporary directory.
   scoped_ptr<base::ScopedTempDir> temp_dir(new base::ScopedTempDir);
   CHECK(temp_dir->CreateUniqueTempDir());
 
   base::FilePath path = temp_dir->path();
   new DirectoryImpl(
       std::move(directory), path, std::move(temp_dir), lock_table_);

[michaeln, 2016/02/26 21:59:24]

is the directory deleted in the event of a program crash? 

does anything use this TempDir feature yet, is there anything in particular
planning to use it yet?

   callback.Run(FileError::OK);
 }
 
 void FileSystemImpl::OpenPersistentFileSystem(
     mojo::InterfaceRequest<Directory> directory,
     const OpenPersistentFileSystemCallback& callback) {
   scoped_ptr<base::ScopedTempDir> temp_dir;
   base::FilePath path = persistent_dir_;
   if (!base::PathExists(path))
     base::CreateDirectory(path);
 
   new DirectoryImpl(
       std::move(directory), path, std::move(temp_dir), lock_table_);
   callback.Run(FileError::OK);
 }
 
 }  // namespace filesystem