Add prefetch support to AffiliationBackend.

components/password_manager/core/browser/affiliation_backend.h

Index: components/password_manager/core/browser/affiliation_backend.h
diff --git a/components/password_manager/core/browser/affiliation_backend.h b/components/password_manager/core/browser/affiliation_backend.h
index eea5e3d7a55ecb5850863ce8f1c2b52bc5f50a31..99ac3e21f751686904b611b3aaeda3fb09313f39 100644
--- a/components/password_manager/core/browser/affiliation_backend.h
+++ b/components/password_manager/core/browser/affiliation_backend.h
@@ -70,18 +70,29 @@ class AffiliationBackend : public FacetManagerHost,
                       const base::Time& keep_fresh_until);
   void TrimCache();
 
+  // Used only for testing.
+  size_t facet_manager_count() { return facet_managers_.size(); }
+
  private:
+  // Retrieves the FacetManager corresponding to |facet_uri|, creating it and
+  // storing it into |facet_managers_| if it did not exist.
+  FacetManager* GetOrCreateFacetManager(const FacetURI& facet_uri);
+
   // Collects facet URIs that require fetching and issues a network request
   // against the Affiliation API to fetch corresponding affiliation information.
   void SendNetworkRequest();
 
+  // Scheduled by RequestNotificationAtTime() to be called back at times when a
+  // FacetManager needs to be notified.
+  void OnSendNotification(const FacetURI& facet_uri);
+
   // FacetManagerHost:
-  base::Time GetCurrentTime() override;
-  base::Time ReadLastUpdateTimeFromDatabase(const FacetURI& facet_uri) override;
   bool ReadAffiliationsFromDatabase(
       const FacetURI& facet_uri,
       AffiliatedFacetsWithUpdateTime* affiliations) override;
   void SignalNeedNetworkRequest() override;
+  void RequestNotificationAtTime(const FacetURI& facet_uri,
+                                 base::Time time) override;
 
   // AffiliationFetcherDelegate:
   void OnFetchSucceeded(