Add foundation for trimming the AffiliationDatabase.

components/password_manager/core/browser/facet_manager.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 COMPONENTS_PASSWORD_MANAGER_CORE_BROWSER_FACET_MANAGER_H_
 #define COMPONENTS_PASSWORD_MANAGER_CORE_BROWSER_FACET_MANAGER_H_
 
 #include <set>
 #include <vector>
 
@@ skipping 40 matching lines @@
   void OnFetchSucceeded(const AffiliatedFacetsWithUpdateTime& affiliation);
 
   // Called by the backend when the time specified in RequestNotificationAtTime
   // has come to pass, so that |this| can perform delayed administrative tasks.
   void NotifyAtRequestedTime();
 
   // Returns whether this instance has becomes redundant, that is, it has no
   // more meaningful state than a newly created instance would have.
   bool CanBeDiscarded() const;
 
+  // Returns whether or not cached data for this facet can be discarded without
+  // harm when trimming the database.
+  bool CanCachedDataBeDiscarded() const;
+
   // Returns whether or not affiliation information relating to this facet needs
   // to be fetched right now.
   bool DoesRequireFetch() const;
 
   // The members below are made public for the sake of tests.
 
   // Returns whether or not cached data for this facet is fresh (not stale).
   bool IsCachedDataFresh() const;
 
   // Returns whether or not cached data for this facet is near-stale or stale.
@@ skipping 53 matching lines @@
   // This is not a single timestamp but rather a multiset so that cancellation
   // of individual prefetches can be supported even if there are two requests
   // with the same |keep_fresh_until| threshold.
   std::multiset<base::Time> keep_fresh_until_thresholds_;
 
   DISALLOW_COPY_AND_ASSIGN(FacetManager);
 };
 
 }  // namespace password_manager
 #endif  // COMPONENTS_PASSWORD_MANAGER_CORE_BROWSER_FACET_MANAGER_H_