Add AffiliationFetcher to fetch authoritative affiliation information regarding facets.

components/password_manager/core/browser/affiliation_fetcher_delegate.h

Index: components/password_manager/core/browser/affiliation_fetcher_delegate.h
diff --git a/components/password_manager/core/browser/affiliation_fetcher_delegate.h b/components/password_manager/core/browser/affiliation_fetcher_delegate.h
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+++ b/components/password_manager/core/browser/affiliation_fetcher_delegate.h
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+// Copyright 2014 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_AFFILIATION_FETCHER_DELEGATE_H_
+#define COMPONENTS_PASSWORD_MANAGER_CORE_BROWSER_AFFILIATION_FETCHER_DELEGATE_H_
+
+#include <vector>
+
+#include "base/memory/scoped_ptr.h"
+#include "components/password_manager/core/browser/affiliation_utils.h"
+
+namespace password_manager {
+
+// Interface that users of AffiliationFetcher should implement to get results of
+// the fetch. It is safe to destroy the fetcher in any of the event handlers.
+class AffiliationFetcherDelegate {
+ public:
+  // Encapsulates the response to an affiliations request.
+  typedef std::vector<AffiliatedFacets> Result;
+
+  // Called when affiliation information has been successfully retrieved. The
+  // |result| will contain at most as many equivalence class as facet URIs in
+  // the request, and each requested facet URI will appear in exactly one
+  // equivalence class.
+  virtual void OnFetchSucceeded(scoped_ptr<Result> result) = 0;
+
+  // Called when affiliation information could not be fetched due to a network
+  // error or a presumably transient server error. The implementor may and will
+  // probably want to retry the request (once network connectivity is
+  // re-established, and/or with exponential back-off).
+  virtual void OnFetchFailed() = 0;
+
+  // Called when an affiliation response was received, but it was either gravely
+  // ill-formed or self-inconsistent. It is likely that a repeated fetch would
+  // yield the same, erroneous response, therefore, to avoid overloading the
+  // server, the fetch must not be repeated in the short run.
+  virtual void OnMalformedResponse() = 0;
+
+ protected:
+  virtual ~AffiliationFetcherDelegate() {}
+};
+
+}  // namespace password_manager
+
+#endif  // COMPONENTS_PASSWORD_MANAGER_CORE_BROWSER_AFFILIATION_FETCHER_DELEGATE_H_