Introduce password_manager::FormSaver

components/password_manager/core/browser/form_saver_impl.h

Index: components/password_manager/core/browser/form_saver_impl.h
diff --git a/components/password_manager/core/browser/form_saver_impl.h b/components/password_manager/core/browser/form_saver_impl.h
new file mode 100644
index 0000000000000000000000000000000000000000..fffb9ea51d1eca1458b2691a2ee928d0d89048c1
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+++ b/components/password_manager/core/browser/form_saver_impl.h
@@ -0,0 +1,76 @@
+// Copyright 2016 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_PASSWORD_MANAGER_CORE_BROWSER_FORM_SAVER_IMPL_H_
+#define COMPONENTS_PASSWORD_MANAGER_CORE_BROWSER_FORM_SAVER_IMPL_H_
+
+#include <memory>
+
+#include "base/macros.h"
+#include "components/password_manager/core/browser/form_saver.h"
+
+namespace password_manager {
+
+class PasswordStore;
+
+// The production code implementation of FormSaver.
+class FormSaverImpl : public FormSaver {
+ public:
+  // |store| needs to outlive |this| and will be used for all PasswordStore
+  // operations.
+  explicit FormSaverImpl(PasswordStore* store);
+
+  ~FormSaverImpl() override;
+
+  // FormSaver:
+  void PermanentlyBlacklist(autofill::PasswordForm* observed) override;
+  void Save(const autofill::PasswordForm& pending,
+            const autofill::PasswordFormMap& best_matches,
+            const autofill::PasswordForm* old_primary_key) override;
+  void Update(
+      const autofill::PasswordForm& pending,
+      const autofill::PasswordFormMap& best_matches,
+      const std::vector<const autofill::PasswordForm*>* credentials_to_update,
+      const autofill::PasswordForm* old_primary_key) override;
+  void PresaveGeneratedPassword(
+      const autofill::PasswordForm& generated) override;
+  void RemovePresavedPassword() override;
+
+ private:
+  // Implements both Save and Update, because those methods share most of the
+  // code.
+  void SaveImpl(
+      const autofill::PasswordForm& pending,
+      bool is_new_login,
+      const autofill::PasswordFormMap& best_matches,
+      const std::vector<const autofill::PasswordForm*>* credentials_to_update,
+      const autofill::PasswordForm* old_primary_key);
+
+  // Marks all of |best_matches_| as not preferred unless the username is
+  // |preferred_username| or the credential is PSL matched.
+  void UpdatePreferredLoginState();
+
+  // Iterates over all |best_matches| and deletes from the password store all
+  // which are not PSL-matched, have an empty username, and a password equal to
+  // |pending_->password_value|.
+  void DeleteEmptyUsernameCredentials();
+
+  // Cached pointer to the PasswordStore.
+  PasswordStore* const store_;
+
+  // Caches the best matches during a call to Save() or Update().
+  const autofill::PasswordFormMap* best_matches_ = nullptr;
+
+  // Caches the pending credential during a call to Save() or Update().
+  const autofill::PasswordForm* pending_ = nullptr;
+
+  // Stores the pre-saved credential (happens during password generation).
+  std::unique_ptr<autofill::PasswordForm> presaved_;
+
+  DISALLOW_COPY_AND_ASSIGN(FormSaverImpl);
+};
+
+}  // namespace password_manager
+
+#endif  // COMPONENTS_PASSWORD_MANAGER_CORE_BROWSER_FORM_SAVER_IMPL_H_