Introduce password_manager::FormFetcher

components/password_manager/core/browser/form_fetcher_impl.h

Index: components/password_manager/core/browser/form_fetcher_impl.h
diff --git a/components/password_manager/core/browser/form_fetcher_impl.h b/components/password_manager/core/browser/form_fetcher_impl.h
new file mode 100644
index 0000000000000000000000000000000000000000..e46438697bd698d3e07dac2ec5c14552eee7cd4e
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+++ b/components/password_manager/core/browser/form_fetcher_impl.h
@@ -0,0 +1,86 @@
+// 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_FETCHER_IMPL_H_
+#define COMPONENTS_PASSWORD_MANAGER_CORE_BROWSER_FORM_FETCHER_IMPL_H_
+
+#include <memory>
+#include <set>
+#include <vector>
+
+#include "base/macros.h"
+#include "components/password_manager/core/browser/form_fetcher.h"
+
+namespace password_manager {
+
+class PasswordManagerClient;
+
+// Production implementation of FormFetcher. Fetches credentials associated
+// with a particular origin.
+// TODO(crbug.com/621355): This class should ultimately work with PasswordStore.
+class FormFetcherImpl : public FormFetcher {
+ public:
+  explicit FormFetcherImpl(const PasswordManagerClient* client);
+
+  ~FormFetcherImpl() override;
+
+  // FormFetcher:
+  void AddConsumer(Consumer* consumer) override;
+  State GetState() const override;
+  const std::vector<const InteractionsStats*>& GetInteractionsStats()
+      const override;
+  const std::vector<const autofill::PasswordForm*>& GetFederatedMatches()
+      const override;
+
+  // TODO(crbug.com/621355): Remove this once FormFetcher becomes a
+  // PasswordStoreConsumer.
+  void set_state(State state) { state_ = state; }
+
+  // TODO(crbug.com/621355): Remove this once FormFetcher becomes a
+  // PasswordStoreConsumer.
+  // Resets the results owned by |this| with new results from PasswordStore and
+  // sets the state to NOT_WAITING.
+  void SetResults(std::vector<std::unique_ptr<autofill::PasswordForm>> results);
+
+  // TODO(crbug.com/621355): Remove this once FormFetcher becomes a
+  // PasswordStoreConsumer.
+  // Resets the stats owned by |this| with new stats from PasswordStore.
+  void SetStats(std::vector<std::unique_ptr<InteractionsStats>> stats);
+
+ private:
+  // Results obtained from PasswordStore:
+  std::vector<std::unique_ptr<autofill::PasswordForm>> non_federated_;
+
+  // Federated credentials relevant to the observed form. They are neither
+  // filled not saved by PasswordFormManager, so they are kept separately from
+  // non-federated matches.
+  std::vector<std::unique_ptr<autofill::PasswordForm>> federated_;
+
+  // Statistics for the current domain.
+  std::vector<std::unique_ptr<InteractionsStats>> interactions_stats_;
+
+  // Non-owning copies of the vectors above.
+  std::vector<const autofill::PasswordForm*> weak_non_federated_;
+  std::vector<const autofill::PasswordForm*> weak_federated_;
+  std::vector<const InteractionsStats*> weak_interactions_stats_;
+
+  // Consumers of the fetcher, all are assumed to outlive |this|.
+  std::set<Consumer*> consumers_;
+
+  // Client used to obtain a CredentialFilter.
+  const PasswordManagerClient* const client_;
+
+  // The number of non-federated forms which were filtered out by
+  // CredentialsFilter and not included in |non_federated_|.
+  size_t filtered_count_ = 0;
+
+  // State of the fetcher.
+  State state_ = State::NOT_WAITING;
+
+  DISALLOW_COPY_AND_ASSIGN(FormFetcherImpl);
+};
+
+}  // namespace password_manager
+
+#endif  // COMPONENTS_PASSWORD_MANAGER_CORE_BROWSER_FORM_FETCHER_IMPL_H_