[Doodle] Cache the DoodleConfig in prefs

components/doodle/doodle_service.h

Index: components/doodle/doodle_service.h
diff --git a/components/doodle/doodle_service.h b/components/doodle/doodle_service.h
index 8913fbf144b8f76005fe457ebcfc947b723f1530..85c5cec35b27707fa00ea0cc1caba5c921261826 100644
--- a/components/doodle/doodle_service.h
+++ b/components/doodle/doodle_service.h
@@ -10,10 +10,14 @@
 #include "base/macros.h"
 #include "base/observer_list.h"
 #include "base/optional.h"
+#include "base/time/clock.h"
 #include "base/timer/timer.h"
 #include "components/doodle/doodle_fetcher.h"
 #include "components/doodle/doodle_types.h"
 
+class PrefRegistrySimple;
+class PrefService;
+
 namespace base {
 class TimeDelta;
 }
@@ -27,9 +31,13 @@ class DoodleService {
     virtual void OnDoodleConfigUpdated(const base::Optional<DoodleConfig>&) = 0;
   };
 
-  // Both |fetcher| and |expiry_timer| must be non-null.
-  DoodleService(std::unique_ptr<DoodleFetcher> fetcher,
-                std::unique_ptr<base::OneShotTimer> expiry_timer);
+  static void RegisterProfilePrefs(PrefRegistrySimple* pref_registry);
+
+  // All parameters must be non-null.
+  DoodleService(PrefService* pref_service,
+                std::unique_ptr<DoodleFetcher> fetcher,
+                std::unique_ptr<base::OneShotTimer> expiry_timer,
+                std::unique_ptr<base::Clock> clock);
   ~DoodleService();
 
   // Returns the current (cached) config, if any.
@@ -54,15 +62,19 @@ class DoodleService {
                      base::TimeDelta time_to_live,
                      const base::Optional<DoodleConfig>& doodle_config);
 
-  void UpdateTimeToLive(base::TimeDelta time_to_live);
+  void UpdateCachedConfig(base::TimeDelta time_to_live,
+                          const base::Optional<DoodleConfig>& doodle_config);
 
   // Callback for the expiry timer.
   void DoodleExpired();
 
+  PrefService* pref_service_;
+
   // The fetcher for getting fresh DoodleConfigs from the network.
   std::unique_ptr<DoodleFetcher> fetcher_;
 
   std::unique_ptr<base::OneShotTimer> expiry_timer_;
+  std::unique_ptr<base::Clock> clock_;
 
   // The result of the last network fetch.
   base::Optional<DoodleConfig> cached_config_;