Encrypt password values in LoginDatabase on Mac.

components/password_manager/core/browser/login_database.h

Index: components/password_manager/core/browser/login_database.h
diff --git a/components/password_manager/core/browser/login_database.h b/components/password_manager/core/browser/login_database.h
index ca3db84438e09ffb6d07e3d4ab36b2d109eaba92..96257e7eae4325d17d514639ba03a743f115a581 100644
--- a/components/password_manager/core/browser/login_database.h
+++ b/components/password_manager/core/browser/login_database.h
@@ -111,6 +111,8 @@ class LoginDatabase {
 
   StatisticsTable& stats_table() { return stats_table_; }
 
+  void set_clear_password_values(bool val) { clear_password_values_ = val; }
+
  private:
   // Result values for encryption/decryption actions.
   enum EncryptionResult {
@@ -170,6 +172,13 @@ class LoginDatabase {
   sql::MetaTable meta_table_;
   StatisticsTable stats_table_;
 
+  // If set to 'true', then the password values are cleared before encrypting
+  // and storing in the database. At the same time AddLogin/UpdateLogin return
+  // PasswordStoreChangeList containing the real password.
+  // This is a temporary measure for migration the Keychain on Mac.
+  // crbug.com/466638
+  bool clear_password_values_;
+
   DISALLOW_COPY_AND_ASSIGN(LoginDatabase);
 };