📰 Let the backend trigger sign in related refreshes

components/ntp_snippets/content_suggestions_provider.h

 // 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_NTP_SNIPPETS_CONTENT_SUGGESTIONS_PROVIDER_H_
 #define COMPONENTS_NTP_SNIPPETS_CONTENT_SUGGESTIONS_PROVIDER_H_
 
 #include <set>
 #include <string>
 #include <vector>
@@ skipping 101 matching lines @@
   // URL matches the |filter|.
   virtual void ClearHistory(
       base::Time begin,
       base::Time end,
       const base::Callback<bool(const GURL& url)>& filter) = 0;
 
   // Clears all caches for the given category, so that the next fetch starts
   // from scratch.
   virtual void ClearCachedSuggestions(Category category) = 0;
 
+  // Called when the sign in state has changed. Should be used instead of
+  // directly registering with the SignInManager so that the
+  // ContentSuggestionService can control the order of the updates between
+  // the providers and the observers.
+  virtual void OnSignInStateChanged() {}
+
   // Used only for debugging purposes. Retrieves suggestions for the given
   // |category| that have previously been dismissed and are still stored in the
   // provider. If the provider doesn't store dismissed suggestions for the given
   // |category|, it always calls the callback with an empty vector. The callback
   // may be called synchronously.
   virtual void GetDismissedSuggestionsForDebugging(
       Category category,
       const DismissedSuggestionsCallback& callback) = 0;
 
   // Used only for debugging purposes. Clears the cache of dismissed
@@ skipping 11 matching lines @@
   CategoryFactory* category_factory() const { return category_factory_; }
 
  private:
   Observer* observer_;
   CategoryFactory* category_factory_;
 };
 
 }  // namespace ntp_snippets
 
 #endif  // COMPONENTS_NTP_SNIPPETS_CONTENT_SUGGESTIONS_PROVIDER_H_