Extract ScopedTestNSSDB from nss_util.

crypto/scoped_test_nss_chromeos_user.cc

+// Copyright 2014 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 "crypto/scoped_test_nss_chromeos_user.h"
+
+#include "base/logging.h"
+#include "crypto/nss_util.h"
+#include "crypto/nss_util_internal.h"
+#include "crypto/scoped_test_nss_db.h"
+
+namespace crypto {
+
+ScopedTestNSSChromeOSUser::ScopedTestNSSChromeOSUser(
+    const std::string& username_hash)
+    : username_hash_(username_hash), constructed_successfully_(false) {
+  if (!temp_dir_.CreateUniqueTempDir())
+    return;
+  constructed_successfully_ = InitializeNSSForChromeOSUser(
+      username_hash, username_hash, temp_dir_.path());
+}
+
+ScopedTestNSSChromeOSUser::~ScopedTestNSSChromeOSUser() {
+  if (constructed_successfully_)
+    CloseChromeOSUserForTesting(username_hash_);
+}
+
+void ScopedTestNSSChromeOSUser::FinishInit() {
+  DCHECK(constructed_successfully_);
+  if (!ShouldInitializeTPMForChromeOSUser(username_hash_))
+    return;
+  WillInitializeTPMForChromeOSUser(username_hash_);
+  InitializePrivateSoftwareSlotForChromeOSUser(username_hash_);

[Ryan Sleevi, 2014/07/23 02:15:29]

This doesn't look like testing code. Trying to understand a bit what's going on
here, if you can explain.

That is, I thought the goal was to create a ScopedTestNSSDB, then set that as
the TPM slot for that user. But this seems very different.

[pneubeck (no reviews), 2014/07/23 14:34:17]

This is moved unmodified from nss_util.cc . If necessary, I'd like to modify it
in a follow up.
Added some explanation of what's going on.

+}
+
+}  // namespace crypto