mandoline filesystem: Save cookie data to the mojo:filesystem.

mojo/runner/scoped_user_data_dir.cc

Index: mojo/runner/scoped_user_data_dir.cc
diff --git a/mojo/runner/scoped_user_data_dir.cc b/mojo/runner/scoped_user_data_dir.cc
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+++ b/mojo/runner/scoped_user_data_dir.cc
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+// 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 "mojo/runner/scoped_user_data_dir.h"
+
+#include "base/command_line.h"
+#include "base/logging.h"
+#include "mojo/runner/switches.h"
+
+namespace mojo {
+namespace runner {
+
+ScopedUserDataDir::ScopedUserDataDir() {
+  base::CommandLine* command_line = base::CommandLine::ForCurrentProcess();
+  if (!command_line->HasSwitch(switches::kUseTemporaryUserDataDir))
+    return;
+
+  if (command_line->HasSwitch(switches::kUserDataDir)) {
+    // User should not specify a --user-data-dir manually when using
+    // --use-temporary-user-data-dir. The point of the flag is to let the
+    // mojo runner process manage the lifetime of the user data dir.
+    LOG(ERROR) << "Ignoring request to --use-temporary-user-data-dir because "
+               << "--user-data-dir was also specified.";
+    return;
+  }
+
+  if (!temp_dir_.CreateUniqueTempDir()) {
+    LOG(ERROR) << "Failed to create a temporary user data dir.";
+    return;
+  }
+
+  command_line->AppendSwitchPath(switches::kUserDataDir, temp_dir_.path());
+}
+
+ScopedUserDataDir::~ScopedUserDataDir() {
+}
+
+}  // namespace runner
+}  // namespace mojo