mojo leveldb: Get profile and leveldb connected to DOMStorageContext.

components/filesystem/main.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 "base/command_line.h"
+#include "base/files/file_path.h"
+#include "base/files/file_util.h"
 #include "base/macros.h"
 #include "components/filesystem/file_system_app.h"
 #include "mojo/public/c/system/main.h"
 #include "mojo/shell/public/cpp/application_runner.h"
 
+#if defined(OS_WIN)
+#include "base/base_paths_win.h"
+#include "base/path_service.h"
+#include "base/strings/utf_string_conversions.h"
+#elif defined(OS_ANDROID)
+#include "base/base_paths_android.h"
+#include "base/path_service.h"
+#elif defined(OS_LINUX)
+#include "base/environment.h"
+#include "base/nix/xdg_util.h"
+#elif defined(OS_MACOSX)
+#include "base/base_paths_mac.h"
+#include "base/path_service.h"
+#endif
+
+namespace {
+
+const char kUserDataDir[] = "user-data-dir";
+
+base::FilePath GetUserDataDir() {
+  base::FilePath path;
+
+  base::CommandLine* command_line = base::CommandLine::ForCurrentProcess();
+  if (command_line->HasSwitch(kUserDataDir)) {
+    path = command_line->GetSwitchValuePath(kUserDataDir);
+  } else {
+#if defined(OS_WIN)
+    CHECK(PathService::Get(base::DIR_LOCAL_APP_DATA, &path));
+    path = path.Append(FILE_PATH_LITERAL("mandoline"));
+#elif defined(OS_LINUX)
+    scoped_ptr<base::Environment> env(base::Environment::Create());
+    base::FilePath config_dir(
+        base::nix::GetXDGDirectory(env.get(),
+                                   base::nix::kXdgConfigHomeEnvVar,
+                                   base::nix::kDotConfigDir));
+    path = config_dir.Append("mandoline");
+#elif defined(OS_MACOSX)
+    CHECK(PathService::Get(base::DIR_APP_DATA, &path));
+    path = path.Append("Mandoline Shell");
+#elif defined(OS_ANDROID)
+    CHECK(PathService::Get(base::DIR_ANDROID_APP_DATA, &path));
+    path = path.Append(FILE_PATH_LITERAL("mandoline"));
+#else
+    NOTIMPLEMENTED();
+#endif
+  }
+
+  if (!base::PathExists(path))
+    base::CreateDirectory(path);
+
+  return path;
+}
+
+}  // namespace
+
 MojoResult MojoMain(MojoHandle request) {
-  mojo::ApplicationRunner runner(new filesystem::FileSystemApp());
+  mojo::ApplicationRunner runner(
+      new filesystem::FileSystemApp(GetUserDataDir()));
   return runner.Run(request);
 }