Introduce ManagePasswordsState class.

chrome/browser/ui/passwords/manage_passwords_state.h

+// Copyright 2015 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_UI_PASSWORDS_MANAGE_PASSWORDS_STATE_H_
+#define CHROME_BROWSER_UI_PASSWORDS_MANAGE_PASSWORDS_STATE_H_
+
+#include "base/callback.h"
+#include "base/macros.h"
+#include "base/memory/scoped_ptr.h"
+#include "base/memory/scoped_vector.h"
+#include "components/autofill/core/common/password_form.h"
+#include "components/password_manager/core/browser/password_store_change.h"
+#include "components/password_manager/core/common/password_manager_ui.h"
+#include "url/gurl.h"
+
+namespace password_manager {
+struct CredentialInfo;
+class PasswordFormManager;
+class PasswordManagerClient;
+}
+
+
+// ManagePasswordsState keeps the current state for ManagePasswordsUIController
+// as well as up-to-date data for this state.
+class ManagePasswordsState {
+ public:
+  using CredentialsCallback =
+      base::Callback<void(const password_manager::CredentialInfo&)>;
+
+  ManagePasswordsState();
+  ~ManagePasswordsState();
+
+  // Set the client for logging.
+  void SetClient(password_manager::PasswordManagerClient* client) {

[vabr (Chromium), 2015/03/10 10:39:57]

nit: The style guide seems to indicate set_client for this kind of inline
setter.
http://google-styleguide.googlecode.com/svn/trunk/cppguide.html#Function_Names

[vasilii, 2015/03/10 11:34:48]

Done.

+    client_ = client;
+  }
+
+  // The methods below reset the object.

[vabr (Chromium), 2015/03/10 10:39:57]

At this point of reading through the class definition, it is not entirely clear
what the meaning and consequences of a reset are. Could you describe the
consequences, to help the potential caller decide if the resetting methods are a
good choice or a bad one?

[vasilii, 2015/03/10 11:34:48]

Done.

+
+  // Move to PENDING_PASSWORD_STATE.
+  void OnPendingPassword(
+      scoped_ptr<password_manager::PasswordFormManager> form_manager);
+
+  // Move to CREDENTIAL_REQUEST_STATE.
+  void OnRequestCredentials(
+      ScopedVector<autofill::PasswordForm> local_credentials,
+      ScopedVector<autofill::PasswordForm> federated_credentials,
+      const GURL& origin);
+
+  // Move to AUTO_SIGNIN_STATE. |local_forms| can't be empty.
+  void OnAutoSignin(ScopedVector<autofill::PasswordForm> local_forms);
+
+  // Move to CONFIRMATION_STATE.
+  void OnAutomaticPasswordSave(
+      scoped_ptr<password_manager::PasswordFormManager> form_manager);
+
+  // Move to MANAGE_STATE or INACTIVE_STATE for PSL matched passwords.
+  void OnPasswordAutofilled(const autofill::PasswordFormMap& password_form_map);
+
+  // Move to BLACKLIST_STATE.
+  void OnBlacklistBlockedAutofill(
+      const autofill::PasswordFormMap& password_form_map);
+
+  // Move to INACTIVE_STATE.
+  void OnInactive();
+
+  // Moves the object to |state| without resetting the internal data. Allowed:
+  // * -> BLACKLIST_STATE
+  // CONFIRMATION_STATE -> MANAGE_STATE
+  // BLACKLIST_STATE -> MANAGE_STATE
+  // PENDING_PASSWORD_STATE -> MANAGE_STATE
+  // CREDENTIAL_REQUEST_STATE -> MANAGE_STATE
+  void TransitionToState(password_manager::ui::State state);
+
+  // Updates the internal state applying |changes|.
+  void ProcessLoginsChanged(
+      const password_manager::PasswordStoreChangeList& changes);
+
+  password_manager::ui::State state() const { return state_; }
+  const GURL& origin() const { return origin_; }
+  password_manager::PasswordFormManager* form_manager() const {
+    return form_manager_.get();
+  }
+  const CredentialsCallback& credentials_callback() {
+    return credentials_callback_;
+  }
+  void set_credentials_callback(const CredentialsCallback& callback) {
+    credentials_callback_ = callback;
+  }
+
+  // Current local forms. ManagePasswordsState is responsible for the forms.
+  const std::vector<const autofill::PasswordForm*>& GetCurrentForms() const {
+    return form_manager_ ? current_forms_weak_ : local_credentials_forms_.get();
+  }
+
+  // Current federated forms.
+  const std::vector<const autofill::PasswordForm*>&
+  federated_credentials_forms() const {
+    return federated_credentials_forms_.get();
+  }
+
+ private:
+  // Removes all the PasswordForms stored in this object.
+  void ClearData();
+
+  // Add |form| to the internal state.
+  void AddForm(const autofill::PasswordForm& form);
+  // Updates |form| in the internal state.
+  void UpdateForm(const autofill::PasswordForm& form);
+  // Removes |form| from the internal state.
+  void DeleteForm(const autofill::PasswordForm& form);
+
+  void SetState(password_manager::ui::State state);
+
+  // The origin of the current page. It's used to determine which PasswordStore
+  // changes are applicable to the internal state.
+  GURL origin_;
+
+  // Contains the password that was submitted.
+  scoped_ptr<password_manager::PasswordFormManager> form_manager_;
+
+  // Weak references to the passwords for the current status. The hard pointers
+  // are scattered between |form_manager_| and |local_credentials_forms_|. If
+  // |form_manager_| is nullptr then all the forms are stored in
+  // |local_credentials_forms_|. |current_forms_weak_| remains empty.
+  std::vector<const autofill::PasswordForm*> current_forms_weak_;
+
+  // If |form_manager_| is nullptr then |local_credentials_forms_| contains all
+  // the current forms. Otherwise, it's a container for the new forms coming
+  // from the PasswordStore.
+  ScopedVector<const autofill::PasswordForm> local_credentials_forms_;
+
+  // Federated credentials for the CREDENTIAL_REQUEST_STATE.
+  ScopedVector<const autofill::PasswordForm> federated_credentials_forms_;
+
+  // A callback to be invoked when user selects a credential.
+  CredentialsCallback credentials_callback_;
+
+  // The current state of the password manager UI.
+  password_manager::ui::State state_;
+
+  // The client used for logging.
+  password_manager::PasswordManagerClient* client_;
+
+  DISALLOW_COPY_AND_ASSIGN(ManagePasswordsState);
+};
+
+#endif  // CHROME_BROWSER_UI_PASSWORDS_MANAGE_PASSWORDS_STATE_H_