Make VariationsService simulate received seeds.

chrome/browser/metrics/variations/variations_service.h

Index: chrome/browser/metrics/variations/variations_service.h
===================================================================
--- chrome/browser/metrics/variations/variations_service.h	(revision 269404)
+++ chrome/browser/metrics/variations/variations_service.h	(working copy)
@@ -30,6 +30,10 @@
 class PrefRegistrySyncable;
 }
 
+namespace metrics {
+class MetricsStateManager;
+}
+
 namespace chrome_variations {
 
 class VariationsSeed;
@@ -81,8 +85,12 @@
   // Register Variations related prefs in the Profile prefs.
   static void RegisterProfilePrefs(user_prefs::PrefRegistrySyncable* registry);
 
-  // Factory method for creating a VariationsService.
-  static VariationsService* Create(PrefService* local_state);
+  // Factory method for creating a VariationsService. Does not take ownership of
+  // |state_manager|. Caller should ensure that |state_manager| is valid for the
+  // lifetime of this class.
+  static scoped_ptr<VariationsService> Create(
+      PrefService* local_state,
+      metrics::MetricsStateManager* state_manager);
 
   // Set the PrefService responsible for getting policy-related preferences,
   // such as the restrict parameter.
@@ -103,9 +111,12 @@
                          const base::Time& date_fetched);
 
   // This constructor exists for injecting a mock notifier. It is meant for
-  // testing only. This instance will take ownership of |notifier|.
+  // testing only. This instance will take ownership of |notifier|. Does not
+  // take ownership of |state_manager|. Caller should ensure that
+  // |state_manager| is valid for the lifetime of this class.
   VariationsService(ResourceRequestAllowedNotifier* notifier,
-                    PrefService* local_state);
+                    PrefService* local_state,
+                    metrics::MetricsStateManager* state_manager);
 
  private:
   FRIEND_TEST_ALL_PREFIXES(VariationsServiceTest, DoNotFetchIfOffline);
@@ -117,9 +128,12 @@
   FRIEND_TEST_ALL_PREFIXES(VariationsServiceTest, SeedNotStoredWhenNonOKStatus);
   FRIEND_TEST_ALL_PREFIXES(VariationsServiceTest, SeedDateUpdatedOn304Status);
 
-  // Creates the VariationsService with the given |local_state| prefs service.
+  // Creates the VariationsService with the given |local_state| prefs service
+  // and |state_manager|. Does not take ownership of |state_manager|. Caller
+  // should ensure that |state_manager| is valid for the lifetime of this class.
   // Use the |Create| factory method to create a VariationsService.
-  explicit VariationsService(PrefService* local_state);
+  VariationsService(PrefService* local_state,
+                    metrics::MetricsStateManager* state_manager);
 
   // Checks if prerequisites for fetching the Variations seed are met, and if
   // so, performs the actual fetch using |DoActualFetch|.
@@ -137,6 +151,10 @@
   // The pref service used to store persist the variations seed.
   PrefService* local_state_;
 
+  // Used for instantiating entropy providers for variations seed simulation.
+  // Weak pointer.
+  metrics::MetricsStateManager* state_manager_;
+
   // Used to obtain policy-related preferences. Depending on the platform, will
   // either be Local State or Profile prefs.
   PrefService* policy_pref_service_;