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diff --git a/crypto/nss_util.h b/crypto/nss_util.h
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+// Copyright (c) 2011 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.
+
+#ifndef CRYPTO_NSS_UTIL_H_
+#define CRYPTO_NSS_UTIL_H_
+#pragma once
+
+#include <string>
+#include "base/basictypes.h"
+
+#if defined(USE_NSS)
+class FilePath;
+#endif  // defined(USE_NSS)
+
+namespace base {
+class Lock;
+class Time;
+}  // namespace base
+
+// This file specifically doesn't depend on any NSS or NSPR headers because it
+// is included by various (non-crypto) parts of chrome to call the
+// initialization functions.
+namespace crypto {
+
+#if defined(USE_NSS)
+// EarlySetupForNSSInit performs lightweight setup which must occur before the
+// process goes multithreaded. This does not initialise NSS. For test, see
+// EnsureNSSInit.
+void EarlySetupForNSSInit();
+#endif
+
+// Initialize NRPR if it isn't already initialized.  This function is
+// thread-safe, and NSPR will only ever be initialized once.
+void EnsureNSPRInit();
+
+// Initialize NSS if it isn't already initialized.  This must be called before
+// any other NSS functions.  This function is thread-safe, and NSS will only
+// ever be initialized once.
+void EnsureNSSInit();
+
+// Call this before calling EnsureNSSInit() will force NSS to initialize
+// without a persistent DB.  This is used for the special case where access of
+// persistent DB is prohibited.
+//
+// TODO(hclam): Isolate loading default root certs.
+//
+// NSS will be initialized without loading any user security modules, including
+// the built-in root certificates module. User security modules need to be
+// loaded manually after NSS initialization.
+//
+// If EnsureNSSInit() is called before then this function has no effect.
+//
+// Calling this method only has effect on Linux.
+//
+// WARNING: Use this with caution.
+void ForceNSSNoDBInit();
+
+// This methods is used to disable checks in NSS when used in a forked process.
+// NSS checks whether it is running a forked process to avoid problems when
+// using user security modules in a forked process.  However if we are sure
+// there are no modules loaded before the process is forked then there is no
+// harm disabling the check.
+//
+// This method must be called before EnsureNSSInit() to take effect.
+//
+// WARNING: Use this with caution.
+void DisableNSSForkCheck();
+
+// Load NSS library files. This function has no effect on Mac and Windows.
+// This loads the necessary NSS library files so that NSS can be initialized
+// after loading additional library files is disallowed, for example when the
+// sandbox is active.
+//
+// Note that this does not load libnssckbi.so which contains the root
+// certificates.
+void LoadNSSLibraries();
+
+// Check if the current NSS version is greater than or equals to |version|.
+// A sample version string is "3.12.3".
+bool CheckNSSVersion(const char* version);
+
+#if defined(OS_CHROMEOS)
+// Open the r/w nssdb that's stored inside the user's encrypted home
+// directory.  This is the default slot returned by
+// GetPublicNSSKeySlot().
+void OpenPersistentNSSDB();
+
+// Load the opencryptoki library into NSS so that we can access the
+// TPM through NSS.  Once this is called, GetPrivateNSSKeySlot() will
+// return the TPM slot if one was found.  Returns false if it was
+// unable to load opencryptoki or open the TPM slot.
+bool EnableTPMForNSS();
+
+// Get name for the built-in TPM token on ChromeOS.
+std::string GetTPMTokenName();
+
+// Get the user PIN for the built-in TPM token on ChromeOS.
+std::string GetTPMUserPIN();
+#endif
+
+// Convert a NSS PRTime value into a base::Time object.
+// We use a int64 instead of PRTime here to avoid depending on NSPR headers.
+base::Time PRTimeToBaseTime(int64 prtime);
+
+#if defined(USE_NSS)
+// Exposed for unittests only.  |path| should be an existing directory under
+// which the DB files will be placed.  |description| is a user-visible name for
+// the DB, as a utf8 string, which will be truncated at 32 bytes.
+bool OpenTestNSSDB(const FilePath& path, const char* description);
+void CloseTestNSSDB();
+
+// NSS has a bug which can cause a deadlock or stall in some cases when writing
+// to the certDB and keyDB. It also has a bug which causes concurrent key pair
+// generations to scribble over each other. To work around this, we synchronize
+// writes to the NSS databases with a global lock. The lock is hidden beneath a
+// function for easy disabling when the bug is fixed. Callers should allow for
+// it to return NULL in the future.
+//
+// See https://bugzilla.mozilla.org/show_bug.cgi?id=564011
+base::Lock* GetNSSWriteLock();
+
+// A helper class that acquires the NSS write Lock while the AutoNSSWriteLock
+// is in scope.
+class AutoNSSWriteLock {
+ public:
+  AutoNSSWriteLock();
+  ~AutoNSSWriteLock();
+ private:
+  base::Lock *lock_;
+  DISALLOW_COPY_AND_ASSIGN(AutoNSSWriteLock);
+};
+
+#endif  // defined(USE_NSS)
+
+}  // namespace crypto
+
+#endif  // CRYPTO_NSS_UTIL_H_