Initialize OSCrypt with a TaskRunner on the main thread

components/os_crypt/os_crypt.h

 // 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.
 
 #ifndef COMPONENTS_OS_CRYPT_OS_CRYPT_H_
 #define COMPONENTS_OS_CRYPT_OS_CRYPT_H_
 
 #include <string>
 
 #include "base/macros.h"
+#include "base/memory/ref_counted.h"
+#include "base/single_thread_task_runner.h"
 #include "base/strings/string16.h"
 #include "build/build_config.h"
 
 #if defined(OS_LINUX) && !defined(OS_CHROMEOS)
 #include "components/os_crypt/key_storage_linux.h"
 #endif  // defined(OS_LINUX) && !defined(OS_CHROMEOS)
 
 // The OSCrypt class gives access to simple encryption and decryption of
 // strings. Note that on Mac, access to the system Keychain is required and
 // these calls can block the current thread to collect user input. The same is
 // true for Linux, if a password management tool is available.
 class OSCrypt {
  public:
 #if defined(OS_LINUX) && !defined(OS_CHROMEOS)
   // If |store_type| is a known password store, we will attempt to use it.
   // In any other case, we default to auto-detecting the store.
   // This should not be changed after OSCrypt has been used.
   static void SetStore(const std::string& store_type);
 
   // Some password stores may prompt the user for permission and show the
   // application name.
   static void SetProductName(const std::string& product_name);
+
+  // The gnome-keyring implementation requires calls from the main thread.
+  // TODO(crbug/466975): Libsecret and KWallet don't need this. We can remove
+  // this when we stop supporting keyring.
+  static void SetMainThreadRunner(
+      scoped_refptr<base::SingleThreadTaskRunner> main_thread_runner);
 #endif  // defined(OS_LINUX) && !defined(OS_CHROMEOS)
 
   // Encrypt a string16. The output (second argument) is really an array of
   // bytes, but we're passing it back as a std::string.
   static bool EncryptString16(const base::string16& plaintext,
                               std::string* ciphertext);
 
   // Decrypt an array of bytes obtained with EncryptString16 back into a
   // string16. Note that the input (first argument) is a std::string, so you
   // need to first get your (binary) data into a string.
@@ skipping 24 matching lines @@
 // For unit testing purposes, inject methods to be used.
 // |get_key_storage_mock| provides the desired |KeyStorage| implementation.
 // If the provider returns |nullptr|, a hardcoded password will be used.
 // |get_password_v11_mock| provides a password to derive the encryption key from
 // If both parameters are |nullptr|, the real implementation is restored.
 void UseMockKeyStorageForTesting(KeyStorageLinux* (*get_key_storage_mock)(),
                                  std::string* (*get_password_v11_mock)());
 #endif  // defined(OS_LINUX) && !defined(OS_CHROMEOS) && defined(UNIT_TEST)
 
 #endif  // COMPONENTS_OS_CRYPT_OS_CRYPT_H_