AffiliationBackend: Implement the better part of on-demand fetching.

components/password_manager/core/browser/fake_affiliation_api.h

Index: components/password_manager/core/browser/fake_affiliation_api.h
diff --git a/components/password_manager/core/browser/fake_affiliation_api.h b/components/password_manager/core/browser/fake_affiliation_api.h
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+++ b/components/password_manager/core/browser/fake_affiliation_api.h
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+// 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 COMPONENTS_PASSWORD_MANAGER_CORE_BROWSER_FAKE_AFFILIATION_API_H_
+#define COMPONENTS_PASSWORD_MANAGER_CORE_BROWSER_FAKE_AFFILIATION_API_H_
+
+#include <vector>
+
+#include "base/macros.h"
+#include "components/password_manager/core/browser/affiliation_utils.h"
+#include "components/password_manager/core/browser/fake_affiliation_fetcher.h"
+
+namespace password_manager {
+
+// Intercepts all AffiliationFetcher requests while in scope, and manufactures
+// API responses based on a set of equivalence classes predefined by the tests.
+class ScopedFakeAffiliationAPI {
+ public:
+  ScopedFakeAffiliationAPI();
+  ~ScopedFakeAffiliationAPI();
+
+  // Adds |affiliated_facets| to the set of equivalence classes that will form
+  // the basis for calculating the fake API responses.
+  void AddTestEquivalenceClass(const AffiliatedFacets& affiliated_facets);
+
+  // Returns whether or not there is at least one pending fetch.
+  bool HasPendingRequest();
+
+  // Returns the list of facet URIs being looked up by the next pending fetch;
+  // or an empty list if there are no pending fetches.
+  std::vector<FacetURI> GetNextRequestedFacets();
+
+  // Calculates the response to, and completes the next pending fetch, if any,
+  // with success.
+  void ServeNextRequest();
+
+  // Ignores the next pending request, if any, without completing it.
+  void IgnoreNextRequest();
+
+ private:
+  ScopedFakeAffiliationFetcherFactory fake_fetcher_factory_;
+  std::vector<AffiliatedFacets> preset_equivalence_relation_;
+
+  DISALLOW_COPY_AND_ASSIGN(ScopedFakeAffiliationAPI);
+};
+
+}  // namespace password_manager
+
+#endif  // COMPONENTS_PASSWORD_MANAGER_CORE_BROWSER_FAKE_AFFILIATION_API_H_