Implement Mac Keychain migration algorithm.

chrome/browser/password_manager/password_store_mac.h

 // Copyright (c) 2012 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 CHROME_BROWSER_PASSWORD_MANAGER_PASSWORD_STORE_MAC_H_
 #define CHROME_BROWSER_PASSWORD_MANAGER_PASSWORD_STORE_MAC_H_
 
 #include <vector>
 
 #include "base/callback_forward.h"
@@ skipping 13 matching lines @@
 
 // TODO(vasilii): Deprecate this class. The class should be used by
 // PasswordStoreProxyMac wrapper.
 // Implements PasswordStore on top of the OS X Keychain, with an internal
 // database for extra metadata. For an overview of the interactions with the
 // Keychain, as well as the rationale for some of the behaviors, see the
 // Keychain integration design doc:
 // http://dev.chromium.org/developers/design-documents/os-x-password-manager-keychain-integration
 class PasswordStoreMac : public password_manager::PasswordStore {
  public:
+  enum MigrationResult {
+    MIGRATION_OK,
+    LOGIN_DB_UNAVAILABLE,
+    LOGIN_DB_FAILURE,
+    ENCRYPTOR_FAILURE,
+    KEYCHAIN_BLOCKED,
+  };
+
   PasswordStoreMac(
       scoped_refptr<base::SingleThreadTaskRunner> main_thread_runner,
       scoped_refptr<base::SingleThreadTaskRunner> db_thread_runner,
       scoped_ptr<crypto::AppleKeychain> keychain,
       password_manager::LoginDatabase* login_db);
 
   // Sets the background thread.
   void InitWithTaskRunner(
       scoped_refptr<base::SingleThreadTaskRunner> background_task_runner);
 
+  // Reads all the passwords from the Keychain and stores them in LoginDatabase.
+  // After the successful migration PasswordStoreMac should not be used. If the
+  // migration fails, PasswordStoreMac remains the active backend for
+  // PasswordStoreProxyMac.
+  MigrationResult ImportFromKeychain();
+
   // To be used for testing.
   password_manager::LoginDatabase* login_metadata_db() const {
     return login_metadata_db_;
   }
 
   // To be used for testing.
   crypto::AppleKeychain* keychain() const { return keychain_.get(); }
 
  protected:
   ~PasswordStoreMac() override;
@@ skipping 54 matching lines @@
   scoped_ptr<crypto::AppleKeychain> keychain_;
 
   // The login metadata SQL database. The caller is resonsible for initializing
   // it.
   password_manager::LoginDatabase* login_metadata_db_;
 
   DISALLOW_COPY_AND_ASSIGN(PasswordStoreMac);
 };
 
 #endif  // CHROME_BROWSER_PASSWORD_MANAGER_PASSWORD_STORE_MAC_H_